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 should AC low side high side low pressure be?

On the other hand, there is possibly a huge leak when the pressure is zero. AC Low Side High, High Side Low: Why Does This Happen? The pressure reading from the low side should be between 25 and 30 psi and the high side between 200 and 250 psi.

Why does the AC blow warm air while idling?

During idling however, the AC starts blowing warm air and it gets warmer and warmer the longer the car is not in motion. It cools the car again when I drive. The system has been charged.

What should the AC pressure be when the engine is on?

When the engine is on When the engine is on and the AC is on high, low pressure readings should be around 30 psi and the high pressure side should be about 250 psi depending on your car. The correct reading will display once the clutch engages and the gauge stops cycling.

What are the symptoms of a bad AC pressure switch?

The most common symptom of a bad AC pressure switch are that you will notice that the AC compressor is cutting on and off rapidly when you are idling your car. These switches between on and off can be noticeable on the engine’s rpm, and you may see or feel fluctuations from it.

Why is hot air blowing in the cool setting?

Dooe could be moving as the conpressor kicks on and off due to low refrig. had this issue with my wifes car and still have to patch the leak . . . damn yard work taking all my time I think GM had a service bulletin on this.

How much is the AC unit on a Silverado?

The hardest part was the last screw holding up the plastic cover above the center hump. Gonna kick that engineer. The part is $137 on gmpartsdirect. Thanks to their wonderful website, there is no direct link or part number.

Why is the AC blowing hot air in my Silverado?

After starting the truck the AC works normally for awhile then the driver side starts blowing hot air. Sometimes it changes to hot in a few m … read more 04 chevy 2wd silverado 1500, yesterday the AC quit blowing cold air out the driver side vents but continued blowing cold out the passenger side vents.

What kind of AC does a 2004 Silverado have?

Vocational, Technical or Tra… 2004 Chevy Silverado 2500 HD manual dual ac, a/c blows cold on passenger side sometimes hot sometimes cold on drivers. Tried disconnecting … read more

Where does the hot air come from on a Silverado Sierra?

I really don’t care about having air I just don’t enjoy burning up so summer because I can’t stop the scorching hot air coming out into the drivers side while the passenger side gets full AC Passenger side under the hood is the 2 hoses running back to firewall.

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 can I find the part number for my Silverado AC?

Thanks to their wonderful website, there is no direct link or part number. When added to cart it shows as “Air conditioner and heater, Evaporator and heater components, Actuator, Mode temp and def, Mode temp and def – 2003-07 – 2003-07” Somewhere along that path, you will see a View Illustration button.

Why is my AC not working on my Silverado?

When I turn on AC, both sides will blow cold for a few minutes and if I hit a small bump in the road, the driver’s side will turn to extremely hot heat and I have to turn off the engine to reset it and it goes back to cold air until I hit another bump in the road.

Why does my AC suddenly start blowing hot air?

I have a 2004 Yukon with 160000 miles and about a year ago the AC would suddenly blow hot air just on the driver’s side while the passenger side still blew cold. After a few weeks it then stating blowing hot air on both sides. The only way to correct it was to turn the car off and back on and then it would immediately start blowing cold again.

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.

Why does my AC keep blowing hot air?

Recently when running the AC, it will randomly begin blowing hot air instead of cold. No matter what I try, the only proven way to get cold air to blow again is to shut the engine off, wait around 5 seconds, then crank back up. After doing this everything seems to work fine for a week or so…then the AC starts blowing hot air again.

How can I Check my Chevy Silverado’s air conditioning?

Use a pressure gauge with a specialized air conditioning fitting to check the low pressure hose on the truck and make sure it maintains 100 psi with the engine off, and 35 psi with it on. First start the car and turn all the knobs to cold and max A/C.

How do you get air out of a Chevy Silverado?

In these cases, a coolant back flush is required to remove the air from the heating system. Locate the hoses that enter the heater core. Disconnect them to release any trapped air. Reconnect the lines. Top off the coolant. Flgure 3. Flush the heater system. This procedure refers to a quick release of air from the system.

Where is the air intake heater on a truck?

The air intake heater is located in the line that runs from the intercooler to the top of the intake manifold on the right side of the engine (left side if you are standing in front of the truck looking into the engine compartment).

Can a bad air heater be in the intake tube?

If it lights then you have a bad heater. It is in the intake tube. Tighten new one to 37 ft lbs. I my case the test light did not illuminate. So, the heater should be good. I am betting on the relay–I can’t imagine a wire going bad.

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.

Why does the driver side blow hot air while passenger cold?

Driver cold Passenger hot Called my dealer and they said “Most likely its the door actuator, i have 15 in stock and sold 23 this year”.

Why does my AC blow cold air on one side and hot air on the other?

Blend door actuators are the most common reason for the car air conditioning to blow cold air on one side and hot air on the other. They can be diagnosed with an advanced scan tool. The scan tool can tell if the blend door actuator should be in a different position than commanded.

Is there an A / C Leak in my Silverado?

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. Early summer i had my a/c leak tested, evac’d and filled.

It is possible your AC system may have a slow leak, or even be overcharged. The AC system will not operate if it senses pressures too low or high. If you get a pressure gauge by Duracool from Wal-Mart you can check if pressure is somewhere between 25-38p.s.i is perfect, and no more than 45 p.s.i.

Why does my Chevy Silverado keep blowing hot air?