Why is my Chevy Silverado heater not working?

While there are a variety of reasons your Chevrolet Silverado 2500 HD heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

Why is the heater not working on my Buick Enclave?

Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. At the simplest level, there are two main reasons why the heater is not working. If it’s not coming on at all, it’s usually either the blower motor or some other wiring issue.

What to do if your Ford Fusion heater is not working?

When the blower motor resistor fails, the air conditioner and heater may still work, but air may blow from the vents at only some of the fan speed settings. If the resistor isn…

What happens when the blower fails on a Chevy Equinox?

When the blower motor fails, the air conditioner and heater may still work, and heat or cool may be felt at the vents, but the air pressure will be dramatically decreased. This Read More When the heater control valve fails, adjusting the temperature may not change the air temperature at the vents, whether hot or cold.

by Alibaster Smith. The heater in your Chevy Silverado supplies the heat to the cabin. There could be several reasons why it’s not working properly. The heat in the Silverado is supplied by the hot engine coolant running through the engine cooling channels. Some of this coolant is diverted from the cooling system into a heater core.

Why is my Ford F350 heater not working?

The job of your F350’s thermostat is to regulate the temperature of the engine. It does this by allowing water to enter the engine when it is getting hot, and by keeping coolant from entering while the vehicle warms up. Sometimes when a thermostat goes bad, it stays stuck open. This allows the coolant to continuously enter the engine.

How can I tell if my car heater is not working?

Common signs include the heater not working, coolant leaking from under the engine, and no voltage across the heater control valve. 1. Heater doesn’t work 2. Leaking coolant 3. Erratic heater behavior Average rating from 129,829 customers who received a Vehicle Engine Cooling Inspection.

What is the problem with my AC heater?

Problem Description. One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.

Why does my Chevy C / K 1500 have no heat?

Do it by leaving the radiator cap off while warming up to operating temperature, the coolant may overflow the radiator but that is the air working out of the system. When the thermostat opens the coolant level will drop in the radiator, at this point keep filling it as necessary until full.

Why is my car heater not blowing heat?

If one is hot and the other not then no coolant through the core. Thus core plugged. If there was no heat at all and the temp gauge was reading really low, then possibly a thermostat stuck open. How many miles on the vehicle?

What to do if your car heater core is failing?

The heater hoses should be inspected when replacing a heater core. Problems with the heater hoses can cause similar problems to a failing heater core and are less expensive to correct. Some cars will need to have the air conditioning system recharged, which can increase the cost of repair. Another problem to watch out for is worn engine mounts.

Is the heater core on my truck leaking?

The heater core is not leaking 23 people found this helpful. No one has figured it out yet? 8 people found this helpful. Right? 2 people found this helpful. Still haven’t figured out the problem 2 people found this helpful. The core is clogged and like 40 bucks at parts store 1 people found this helpful. 2 people found this helpful.

One of the most common (and inconvenient) problems with the Chevy Silverado is when it has no heat coming from the heater. Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. At the simplest level, there are two main reasons why the heater is not working.

Why does my car heater not turn off?

My guess is that some valve expands too much and gets stuck on, and the only way is stop the car (or the airflow) so it’ll cool down and pop back into place? My truck, 2001 Silverado 1500 LS/Z71.

Why is my Acura MDX heater not working?

If the heat is blowing, but blowing cold, it has something to do with the coolant getting to the heater core, or the heater core itself. At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core.

Where does the heat come from in a Chevy Silverado?

The heat in the Silverado is supplied by the hot engine coolant running through the engine cooling channels. Some of this coolant is diverted from the cooling system into a heater core. A fan then blows on the core to blow warm into the air into the cabin.

How do you replace a heating system in a Silverado?

Before you go replacing a heating system in your Silverado, however, troubleshoot the heater in your truck. Turn the engine on and allow the engine to warm up to normal operating temperature.

How to fix Chevy GMC Truck heater blend door?

1999 – 2004? Chevy GMC Truck Heater Blend Door Stuck Easy Fix How-to – YouTube If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations. To avoid this, cancel and sign in to YouTube on your computer. An error occurred while retrieving sharing information.

How does a defroster work on a GMC Truck?

Line up the heater/defroster valve lever with the mode actuator cam slot. Line up the A/C valve lever with the mode actuator cam. 2. Install the mode actuator mounting screws to the HVAC module. Tighten the screws to 1.6 N·m (14 lb in). 3. Connect the electrical connection at the mode actuator (10). 4. Install the Body Control Module.

What to do if your defrost is not working?

Place the ignition switch to the OFF position. Remove the HVAC/ECAS fuse for a minimum of 10 seconds. Install the HVAC/ECAS fuse. Start the vehicle. Wait 40 seconds for the HVAC control module to self-calibrate. Verify that no DTCs have set as current DTCs.

Why is my Chevy Silverado 1500 heater not working?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My Heater Working? What are common reasons my Chevrolet Silverado 1500 has heater problems?

How do you install a defroster on a GMC Truck?

1. Install the mode actuator as an assembly with the actuator cam. Line up the heater/defroster valve lever with the mode actuator cam slot. Line up the A/C valve lever with the mode actuator cam. 2. Install the mode actuator mounting screws to the HVAC module. Tighten the screws to 1.6 N·m (14 lb in). 3.

What to do if your Silverado blower won’t work?

Head under the hood and check the blower motor wiring to make sure it is getting power to it. If it is, then your only option is to remove the blower motor and have it tested or replaced. You can do so yourself if you have the equipment, or have it done at the dealership or parts store. Figure 3. Silverado blower motor and fan assembly.

Is the radiator on my Silverado 1500 working?

2000 chevy silverado 1500 ext cab / 5.3 / 4×4. NO HEAT. The aft hose by the termastat is hot. The middle and bottom radiator hose is cold. I just … read more I am not getting any heat into the cab of my pick-up truck. 2000 GMC Sierra 5.3 liter.

How does a Chevy Silverado engine heater work?

Some of this coolant is diverted from the cooling system into a heater core. A fan then blows on the core to blow warm into the air into the cabin. Before you go replacing a heating system in your Silverado, however, troubleshoot the heater in your truck. Turn the engine on and allow the engine to warm up to normal operating temperature.

Before you go replacing a heating system in your Silverado, however, troubleshoot the heater in your truck. Turn the engine on and allow the engine to warm up to normal operating temperature.

What should I do if my Silverado truck is overheating?

Fill the radiator with coolant and allow the truck to run for 20 minutes. This will determine if the coolant level is low, causing the truck to overheat. Use extreme caution when working with the coolant system. The coolant is very hot and builds pressure which could be hazardous.

How much does a Chevy Silverado heater cost?

One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code (s) stored in the HVAC control module should be available to assist with diagnoses. The average cost for a Chevrolet Silverado 1500 AC Diagnosis is between $53 -$67.

Why is the heater not working on my Ford Escape?

If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure. If you look at your temperature gauge, and the engine is running hotter than normal, but there is not heat coming from the heater you may be having issues with the water pump.

Why do the vents in my Chevy Silverado blow only?

Recharge the A/C. There may be air trapped in the system. Hot coolant is responsible for passing through the heater core, creating hot air which can than pass through the vents and into the cabin. On some occasions air can become trapped in the system, stopping the coolant from doing its job.

Where are the heaters on a Silverado Sierra?

The hoses are easy to find they are on the left side of your engine compartment going through the firewall near what would be the back side of your glove compartment. If your engine is hot and the heat is on, both of these hoses should be warm or hot to touch. If one of them is not warm, your problem is most likely here.

How does climate control work on a Silverados blower?

With a little time on your back and a flashlight, you maty be able to see the problem under the dash and possibly repair it. The next up level unit has two sliders for temp adjust and they have electronic control motors that move the temperature door. The premium heater case has automatic temperature control which is also electronic door control.

What causes hot air to blow out of driver side vents?

2004 silverado – hot air blows out of driver side vents, pass side stays cold. Restart the truck, it returns to normal. Click to expand… Give this a try before you starting taking the dash out and buying parts. Same thing has happened to me a few times in the past. Usually just the passengers side.

Where is the temperature cable on a Silverado blower?

If you remove the glovebox door you may be able to see the end of the cable at the temperature door. To see the end at the heater control, you will need to remove the heater/ac control head from the dash and inspect the cable.

Why does my Chevy Silverado keep blowing hot air?

From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. I would check the charge in the system. You might be just a little low on refrigerant. (Low enough to intermittantly trip the “Low-pressure” switch.)

What causes hot engine but no heat from heater?

When the engine is warm feel both heater hoses. If one is cool and one is hot then you have an obstructed heater core (or a bad heater core valve, if it has one. some vehicles use a mechanical valve to turn the coolant flow on and off to the heater core).

Why does my heater not change the temp?

The temp control switch is only switching temps half the time. Sometimes it will work sometimes it wont. I can turn it back and forth from hot to cold and it will not change the temp coming out of the vents. Its random, sometimes just playing with it for awhile will get it to work. Any idea what it could be? Hoping its just the switch.

Is there a problem with my AC heater?

Im Having problems with my trucks heater/ac. The temp control switch is only switching temps half the time. Sometimes it will work sometimes it wont. I can turn it back and forth from hot to cold and it will not change the temp coming out of the vents. Its random, sometimes just playing with it for awhile will get it to work.

Why is my heater not working on my S10?

While not having enough coolant may make your engine run hotter, it can also cause your S10 to not be able to create enough heat. Is there isn’t enough line pressure, due to low coolant, then the heater core will not be able to get any coolant itself.

Why does my Chevy Camaro heater not work?

They both should feel warm or hot to the touch with the engine on. If one of the hoses is hot, and the other one is cold, that is a pretty good indication that the heater core is clogged. If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure.

Why is my heater not working on my Buick Encore?

If you have a heater core that clogged, it’s not going to be able to pass coolant through. Without the warm coolant going through it, there can be no heat. A bad heater core can also leak, so watch out for that. Feel your passenger floorboard to see if it’s wet.

Which is the best a / C heater blower motor?

Shop AutoZone for Chevrolet C1500 A/C Heater Blower Motor. 10% OFF $75. Use Code: DIYSAVE10 Online Ship-to-Home Orders Only

What happens if you run a Chevy Silverado Hot?

The Chevrolet Silverado is a rugged truck that is made for a tough workload. Coolant system failure can eventually cause major engine damage as running the truck hot can lead to head gasket failure or loss of power eventually causing the motor to stop running.

Why is my Delta 88 heater fan not turning on?

My 1999 Olds Delta 88 heater fan switch turns blower on only occasionally and even then the high setting cuts off the fan (if it’s working). Probably a bad blower motor resistor you have there, or possibly a faulty blower motor or switch. The most common thing would be the resistor assembly, as that goes out more often than the other parts.

What should the temperature be on a Chevy Silverado heater?

Turn the engine on and allow the engine to warm up to normal operating temperature. Normal operating temperature is reached when the needle on the temperature gauge sits at or near the middle mark on the gauge. Turn the heater on the highest setting and set the fan speed to the highest setting.

Which is Chevy Silverado has the best a / C heater motor?

Shop AutoZone for Chevrolet Silverado 2500 HD A/C Heater Blower Motor. 10% OFF $75. Use Code: DIYSAVE10 Online Ship-to-Home Orders Only

Why does my Silverado fan only work on 3 + 4?

I have an 01 Silverado and the fan only works on 3+4, so a solution would be very helpful if anyone knows one, thanks It’s probably a bad blower motor resistor. I would replace the blower motor as well. Usually what happens is the blower motor gets worn bearings/bushings and pulls too many amps, which in turn burns the resistor out.

Why is my Colorado air conditioner fan not working?

It’s probably a bad blower motor resistor. I would replace the blower motor as well. Usually what happens is the blower motor gets worn bearings/bushings and pulls too many amps, which in turn burns the resistor out. This is a common problem with the Colorados like the one I just got rid of…

Why did I purchase a Chevy AC blower?

I purchased two of these because I thought the 1st blower had an issue as it would not lock into place so I tried the second blower it did same thing would not lock into housing. The oem part locked in perfect. Do not purchase this part save you money and go directly to parts house an get what you need.

How to fix a 2004 Chevy Silverado problem?

No one has added a helpful site for this 2004 Silverado problem yet. Be the first! Read reviews of repair shops in your area. Enter your zip code: Search CarComplaints.com for these popular complaint phrases…

Why does my car heater keep blowing hot air?

If you restart engine it will blow cold air for a few seconds then start blowing hot air again. Have noticed that even when you turn off ac/heat still blows hot air out of vent by feet. Sometimes the heat on the driver’s side just goes to full blast- even with the A/C on or the heater. It stays on until the engine is shut off and restarted.

Why does my Chevy Silverado have no heat?

One mid vent also produces no air. One heater line to the firewall from the engine is hot while the other is cold. a/c and heat all comes out of defrost vent and cannot switch from hot to cold without shouting off engine for a little bit. ac and heat doesnt work,fan worksin three of four speeds. Ditto.

What happens when your Chevy Sonic heater stops working?

At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your Sonic, this process has failed in one way or another.

Why is my heater not working on my Buick Enclave?

If it’s not coming on at all, it’s usually either the blower motor or some other wiring issue. If the heat is blowing, but blowing cold, it has something to do with the coolant getting to the heater core, or the heater core itself.

Why do I not get heat from my car heater?

That’s why you won’t get heat until the car has been running for a couple of minutes. As the engine gets hotter, so does the coolant. Because we rely on the coolant system to provide us with heat through our heaters, there are now a few components that can fail and mean that you’ll never get heat out of your car heaters.

Can a car not have a heater control valve?

Not all vehicle are equipped with a heater control valve. If a valve is not used, coolant continuously flows though the heater core.

What does it mean when your car heater core is leaking?

If your windows are fogging, it means the feed pipe is leaking. It could also mean that the small pipings in the heater core have a leak. Instead of hot air blowing into the cabin, the hot coolant leaks and evaporates into steam. The cool air in the car condenses the hot coolant. This is how your windows become fogged out.

What are the signs of a bad heater control valve?

Many factors can cause a bad heater control valve. Here are some of the warning signs of a bad heater control valve: Heater operates erratically, putting out more or less heat without any control changes Higher-than-normal temperature gauge readings (from loss of coolant)

Why is my coolant leaking in the back of my car?

You could have a leaking rubber hose or the heater control valve in the rear area. The coolant leak will need to have the cooling system pressure tested to see if a hose or component is leaking in the rear heater system. If you lose all the coolant, the engine will overheat and can cause engine damage.

Do you know if your car is running hot but not overheating?

Most drivers look at their temperature gauge so rarely that many vehicle manufacturers don’t even include temperature gauges any more but just lights that will come on if your car is either extremely cold or extremely hot. However, if your car is running hot but not overheating, you might not know it without a gauge.

What to do if your car heater is not working?

Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. Start the engine with cap still open and let the engine idle for a few minutes. If the coolant level should drop as the thermostat opens, top it up as necessary.

Why is my rear defroster not working properly?

A break in the grid pattern could have been caused by an impact that left a scratch or missing section in the paint. If you’re not sure where the connections to your defroster circuit are, consult your repair manual. If you found nothing wrong visually, you can buy an inexpensive tester designed for rear defrost systems.

Why does my Chevy Silverado blow hot air on one side?

This article applies to the Chevrolet Silverado (1999-Present). Does your Silverado blow hot air on one side and cold air on the other? If you have dual zone controls you may have run into this problem before. There is a way to fix this if you’re patient and willing to troubleshoot your way through it.

What to do about HVAC issues on a Chevy Silverado?

If you’ve noticed the control issues happening after disconnecting the battery or having repair work done, then the quickest fix is to recalibrate the HVAC. Turn the ignition off. Find the three HVAC fuses; Two are under the hood and one is in the cab fuse box.

What is the code for a 2003 Chevy Silverado?

This 2003 Chevrolet Silverado came in with the air flow stuck on defrost. A simple diagnosis of a code B0263 found a faulty mode actuator. This repair applies to 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, and 2011 Chevrolet Avalanche, Silverado, Suburban and Tahoe.

Why does my rear window heater not work?

The idea of running electric current through a circuit to generate heat and clear up your car’s rear window arose a few decades after automobiles took to the roads. These days, with the touch of a button, those lines on your back window heat up to melt away fog and frost. But sometimes, in the midst of winter, they don’t work.

How to change the mode actuator on a 2003 Chevy Silverado?

This repair of course should be generally the same for 2003 through 2007 Classic series trucks and suvs. Remember to preset the controls to the split defrost / floor position before removing the old actuator. If needed, use a small screwdriver or the edge of a quarter to rotate the actuator into the correct position.

What are the signs of a bad heater motor?

Common signs include the car’s heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. 1. Blower motor stuck on one speed 2. Blower motor does not work on certain settings 3. No air from the vehicle’s vents Average rating from 130,908 customers who received a Vehicle Engine Cooling Inspection.

What kind of heater does a Chevy 1500 have?

I have a 1992 chevy 1500 4.3l 2wd. Went out to start the truck and the heater controls were black wont come on no heat or ac. I have checked the fuses all good I have also put two new controls in and nothing.

Why is my Chevy Blazer not blowing hot air?

If there is a lack of hot coolant running through the heater core or less common, a pocket of air trapped in your heater core, the vents will not produce hot air. It is crucial that you immediately check the level of the antifreeze in your radiator and fill it until it is full.

Where is the heater located on a Chevy Blazer?

The cabin heater in your vehicle produces heat from a heater core. The heater core is a small radiator, located under the dashboard of the vehicle and consists of conductive aluminium or brass tubing with cooling fins to increase surface area. Hot coolant passing through the heater core gives off heat before returning to the engine cooling circuit.

Open glove compartment, and lift tab in upper left corner to allow the glovebox to swing down completely towards the passenger floorboard. 3. Gently remove the line that enters the “Vac Unit”, and then the “Vac Unit” itself by wiggling it upwards off its mount. Once removed gently swing it towards the drivers side and out of your way.

What causes a heater head to fail on a car?

It failed (ruptured diaphragm) and allowed oil to be sucked into the vacuum lines. This oil caused the switches/actuators inline to also fail. They also mentioned heater control head problems as a result, I believe (sorry, going from memory).

One heater hose is really hot the other is Luke warm. Probably a plugged heater core Agree. At the shop we use air and water from a rig i made up, works pretty good on a stubborn core, if it comes to that. Possible heater blend door or actuator as well if flush is no help.

Why does my radiator not heat up properly?

The radiator cap used to be used to hold the pressure in the radiator and only flow through that small hose if it overheats and overflows. I think in modern systems where the only caps is the reservoir cap, that pressure valve is in the radiator itself. There may be a way to pull and replace it, but it might be a radiator change.

Is there a problem with my Silverado truck?

I have searched the “inter-web” for the last few weeks with no luck. Here’s the problem…..02 Silverado 1500 5.3 2wd. Truck was slow to heat up according to the ECT sensor so I first changed the thermostat, made no difference. New ECT sensor, made no difference.

Why is the a / C on my 1992 Chevy not working?

Have a competent A/C tech check your freon charge, my money is on it being low. Re: 1992 AC Problems-Blinking A/C and not working.. A/C blinks and won’t work. If the battery is disconnected it will work again but it will go into the not working mode sooner or later.

How to fix a heater that quit working?

I started tracing the wires and found that there is a plug under the glove box there there is a HOT (red) wire that was overheating due to a bad connection and it was melting… here is where my plug is… – remove the screws on sides of glove box and remove the glove box it’s self…

Why does my GMC 1500 heater not come down?

I HAVE A 2000 GMC PICKUP Z71 THAT THE CONTORL FOR THE TEMPERATURE DOES NOT COME DOWN UNTIL THE TRUCK IS SHUT OFF. THE HEATER CONTOL PANEL WAS JUST CHANGED. ALSO IT HAS AC AND MANUAL CONTROLS … read more

Why are the heater controls on my truck not working?

Went out to start the truck and the heater controls were black wont come on no heat or ac. I have checked the fuses all good I have also put two new controls in and nothing.

What to do when your car heater won’t turn on?

If your system has a bleed port or bleed screw, and you can find it, you can fix this air lock yourself. Run the engine until the fan kicks in. Once your fan has come on, look around the radiator for a bleed port or bleed screw. This is something that can be turned with a screwdriver.

Where can I buy a 2004 Chevy Silverado?

2004 Silverado 1500 listings within 50 miles of your ZIP code. Get answers to buy with confidence. Save when you purchase multiple reports. Select from one or more dropdowns below, to find the right car for you.

Why did my Chevy Silverado blower fan stop working?

This is the third Chevy truck and this one has had the oddest problems by far. As others have reported, first the “5” fan setting stopped working… probably around 60,000 miles on odometer. Now, all settings are broken at 135,000. I’ll probably try to fix it myself. Blower fan resistor went out.

Why does my Silverado blow cold air and then hot air?

I have a 2004 Silverado 4×4 with duel temp controls. It recently starting blowing hot air when the a/c is on but it only blows hot air on the drivers side. The passenger side still blows cold. The only way to get it to blow cold again is to shut it off, wait a few minutes and start it back. It doesn’t do it every day.

What’s the problem with my Chevy Silverado heater?

Fan is working, and some cool air seems to be sneaking thru, but it appears the vent actuators are not working. Have not been able to remedy the problem yet. I’ve changed the drivers side dual blend door actuator but the heat will intermittently blow hot to cold air. On the drivers side and the passenger side is completely fine.

Is there a problem with my Ford truck heater?

Occasionally the driver side air will go from AC to heat! Have to stop the car and restart it to get it to be AC again. Time to sell and buy a Ford. Intermittent problem with driver side ac blows hot passenger side ice cold not all the time shut truck off 20-30 min.

Why does my water heater blow hot and cold?

It blew fairly warm for a few seconds then turned to cold. When I have the setting on cold, its cold. When its on hot, its hot until I turn the blower on.

What should I do if my car heater is not working?

Begin with the vehicle on level ground, engine off (cold) in park with the emergency brake set. Step 1 – A heater cannot operate unless the engine is full of coolant/antifreeze. If coolant level is low check the system for leaks. Step 2 – The engine thermostat control the rate in which the engine heats up.

What happens when your Chevy S10 heater stops working?

At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your S10, this process has failed in one way or another.

When to troubleshoot the electrical system in a Chevy Silverado?

This happens sometimes when trailer wiring has been added, causing electrical system problems. Consider having the BCM or Body Control Module replaced if your Silverado repeatedly blows out the same fuses or if it seems like you’re experiencing one electrical problem after another.

Why is my Chevy Silverado 2500 HD heater not working?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Isn’t My Heater Working? What are common reasons my Chevrolet Silverado 2500 HD has heater problems?

Why is my HVAC fan not working on my Silverado?

Good afternoon everyone! Just bought my first Silverado last November. The HVAC fan speed works on 1, 2 & 3, but not 4 or 5. I read somewhere that it could be a resistor problem.

Why does my AC heater not work at all?

Heater/ac fan does not work on any setting or speed. All fuses ohm fine under hood and under rear seat What info are you needing? Hi and thanks for your question! There may a problem with the blower motor resistor/connector. On the passenger side,under the dash, is where the blower resistor is located.

What to do when your car heater won’t turn off?

When I turn on my heater (moving the temp control from cold to hot), most of the time it will stay on hot even after I turn it back to cold. Not sure what to do. If I turn off the vent system completely (pushing the recirc button), sometimes after a while (an hour while the engine is still on) it’ll go back cold.

Why does my heater not work on high speed?

Heater blower motor will not work on high speed? I have replaced the black bosch relay behind the glovebox, the blower resistor and the blower motor and still cannot get the blower to work on high. I remember in older model years of gmc’s and chevys that their was a high speed blower relay that caused this issue.

Why does my Chevy Silverado blow cold air?

When you drive down the road the AC on the drivers side starts blowing out hot air. You have to stop and restart the truck for it to blow cold air again. The passenger side continues to blow cold air and is not affected. It started doing in one time a day but is now doing it four or five times a day. It is currently in the shop.

What should I do if my AC is not working on my Silverado?

Start by inspecting the condition of the cabin air filter on your Silverado 1500. Instead of changing it directly, it is often recommended to first clean the pollen filter. This can be done, for example, with a vacuum cleaner or a compressed air system, removing at least a large part of the visible dirt particles.

Where are the vents on my GMC Sierra?

No output on dash face vents or defrost vents but floor works ok. I have tried the pulling the fuses both under hood and left of dash but that did not fix my problem.

How to check for good blower, no heat?

Re: good blower, no heat.. First thing I would check is to be sure you have coolant flow through the heater core. This can be done by warming up the engine and feeling the temperature of the inlet and outlet hoses.

What to do if your air conditioner has no heat?

This can be done by warming up the engine and feeling the temperature of the inlet and outlet hoses. If the inlet is hot and the outlet is cold you may still have some blockage inside the core. I personally believe your problem is with the temperature door itself withing the heater case.

Why is my GMC Sierra 1500 heater not working?

While there are a variety of reasons your GMC Sierra 1500 heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

What’s the problem with my Dodge Ram heater?

Symptom 2 – Luke warm heat when set to 100% hot. Symptom 3 – The faster I turn the fan up the colder the air coming out gets.

What to do if your Chevy Silverado heater stops working?

If the heater has stopped working in your Silverado, this process has failed in one way or another. A word of caution: If there is no coolant in your overflow, you can refill it by adding more to the overflow reservoir. There is almost never a situation where you would need to take the radiator cap off of the radiator to add coolant.

Why is my Chevy Silverado heater not working?