Why does my car heater blow hot and cold?

If i turn it off for about 10 minutes it will blow hot again for again about 10 minutes and then blows cold again out of the defrost vents. If I am running defrost it is basically the same hot for a little while and then cold untill i turn it off for a little bit. My car has 118000 miles. My car has an automatic transmission.

Why does the AC blow warm at idle?

Since the AC compressor is driven by the engine, it doesn’t pump as much refrigerant when you’re at a stop or driving slowly. If the system is low on refrigerant, it will show up as AC blows warm at idle and blows colder when the engine is running at higher RPMs. Get your system refrigerant level checked.

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.

Where is the a / C to heat control on a Jeep Liberty?

As with the Jeep Liberty, the A/C to heat control is the centre dial on your dash. This opens and shuts the gate behind the dash to determine how much hot or cold air goes into the system. This is operated by an electronic part called an actuator. It simply goes up and down to open and shut the gate.

Why is my Chevy Silverado heater not working?

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 does my car heater blow cold air?

As soon as I stop at a red light, or am idling for any length of time the air coming out of the vents begins to lose temperature until it blows cool air. All I have to do to get hot air again is give it a little gas, say 200 more rpms, and the heater immediately responds with warmer air, hot air if I maintain 1000 rpms.

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.

Why does my heater make a high idle noise?

Same thing with the heat. No heat till Im driving on the highway. I notice that while driving, there seems to be a high idle noise. When i turn the heater or the AC on, the high idle sound goes away. What may this be? 1998 Dodge Ram Van B1500 V6

Is the Ford Focus hot air blower working?

I have recently purchased a 2009 Ford Focus Zetec 1.6TDCi (109PS) Hatchback. The heater blower is working i.e you set it to 1, 2, 3 or 4 and the blower changes speed/force. The blend control is also working i.e you can point it to windscreen/front vents or foot well etc. I can hear it change direction when selected and feel it.

How long does it take for a water heater to blow hot air?

Heater blows hot for 10 minutes, then it blows cold. chry… Q: Heater blows hot for 10 minutes, then it blows cold. When i run my heater it blows hot for 10 minutes or so, then it blows cold air out of the defrost vents.

Why does my air conditioner keep blowing cold air?

It is also possible that the heater controls are allowing cold outside air to “blend” with heated air by not closing one of the ducts in the HVAC unit.

Why does my Ford F-150 blow only hot or cold air?

The heater core is buried deep, but you can feel the entry and exit hoses. Hot water in, hot water out, then everything is fine. If not, your heater core may need back flushing. (Related Discussion: Before replacing heater core – www.f150online.com.) Step 2 – Does the A/C work? Figure 2. Check the coolant temperature sensor.

What to do when your car heater is blowing cold air?

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. This should bleed off the air bubble. When the engine is fully warmed up, put the cap back on and take a drive to see if the heat output has returned.

Why do my vents blow only hot or cold air?

Here is why your Ford F-150 or Super Duty’s vent is only blowing hot or cold air. This article applies to the Ford F-150 (2004-2014) and F-250 (2005-2014). Whether you are in the midst of a 110° heat wave or the arctic chill to end all arctic chills, you expect your HVAC vents to blast you with the desired dose of cold or hot air.

Why is my hot water heater blowing cold air?

Heater core exterior: The heat-radiating fins on the outside of your heater core could also be clogged with debris that makes its way in from the outside air intake at the base of the windshield. This can affect the heater’s output.

Why is my car not running at a constant temp?

This problem could be either an engine thermostat that is not keeping the engine at a constant running temperature (temp gauge steady in the center), or the heater control valve or controls are malfunctioning not allowing engine coolant into the heater core (passenger compartment).

When heating my car up in the mornings the heater doesn’t get to it’s full warmth until I start driving. Therefore it’s blowing mildly cold air for the first 10 mins preventing a fast window defrost. I’ve made sure the coolant (50/50 mix) is filled to the line.

Why is my car heater not working properly?

The last common problem with car heaters is a water leak. There are many different places leaks can surface, so be sure to check your hoses, radiator and water pump for damage. If any of these three are leaking, your car heater won’t work properly.

Why is the Vauxhall Corsa heater blowing out cold air?

The problem with the heater on the Vauxhall Corsa (as well as the Renault Clio) is often that there is no power from the heaters at all. This issue has nothing to do with cold air coming out instead of heat. This loss of power is also a common issue on the Renault Clio. Or you may have a dirty fan that is stuck.

Can a car heater be unreliable in the winter?

Unreliable car heaters can make the cold winter months practically unbearable. Several things can potentially go wrong with automotive heaters because, much like a home heating system, there are many components working together to heat your car. If one or more of these issues is present, your vehicle may blow out cool air rather than heat:

What should I do if my car a / C is blowing hot air?

Check the front of your vehicle for debris, the engine cooling fans for proper operation, and your cabin air filter for debris and dirt. The refrigerant in your system also needs to be able to flow properly through the system. Check your compressor for proper operation, clogs in your system and the proper amount of refrigerant.

Why is the air conditioning in my car not working?

The air conditioning system in your car is designed to cool down the air in the cabin of your vehicle to keep you comfortable on a hot day. It’s something that we often take for granted until it’s a hot day and your car’s A/C is not working.

Why does my Ford AC blow warm air?

This only happens with manual heater controls. So if you’ve got auto temp control, ignore this post. When you turn the temp to cold, the heater control should command the blend door actuator to close off the airflow from the heater core. But these doors are known to have problems. So are the actuators.

Is the a / C working but blowing hot air?

I do hear the a/c clutch kicking in, blower is working and all vent direction are working when I select them (defrost, vent, ac vent, heater). Really hot air and more than normal on the vent selection. Just would like some feedback so I can attack this problem this weekend.

Is the a / C working on my new Ford?

Yes it is electronic temp control (sensors) and I hear the clutch kick in and stay on but will inspect physically also. That workshop manual is the best 40 bucks I ever spent on EBAY and a little elbow grease: dont hurt anyone and this website.