A/C blowing hot air

NELSONK12

MEMBER
2006 CHEVROLET COBALT
130,000 MILES

The AC is blowing mostly hot air but will sometimes get cold for a few seconds. It also is very loud outside of the car. I have checked the A/C related fuses and ensured that the clutch is engaging, but I don't see any problems. The intensity of air flow also increases as I turn the dial on the dash. So I'm not sure what the problem is and I'm smothering in the 100 degree heat. Please help!

Monday, July 20th, 2020 AT 11:44 AM

3 Replies

ASEMASTER6371

MECHANIC
52,796 POSTS

Good afternoon,

Do you have a set of gauges to check the Freon pressures? I need to see the high and low side readings.

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

When you command cool and heat, can you hear the blend door move in the heater case?

https://www.2carpros.com/articles/replace-blend-door-motor

Roy

AIR TEMPERATURE ACTUATOR REPLACEMENT

REMOVAL PROCEDURE
1. Remove the fuse labeled HVAC CTRL (BATT).
2. Remove the steering column filler panel.

imageOpen In New TabZoom/Print

3. Disconnect the air temperature actuator electrical connector.

imageOpen In New TabZoom/Print

4. Remove the air temperature actuator screws.
5. Remove the air temperature actuator.

Images (Click to make bigger)

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Monday, July 20th, 2020 AT 12:15 PM

NELSONK12

MEMBER
2 POSTS

Hi Roy,

So I got a gauge and it says there is almost too much pressure in the A/C system. (I don't think it makes a difference but I checked it just as a thunderstorm was beginning so I didn't get a chance to take a picture, but I can later if you need it). I also checked the blend door. I don't hear it clicking behind the dash, and it opens and closes just fine. The sound I hear can only be heard outside of the car and it is a constant trill (not sure how to best describe the noise) while the A/C is on. It doesn't matter if it is on the lowest setting or the highest and it goes away as soon as I turn the A/C off.

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Wednesday, July 22nd, 2020 AT 1:48 PM

ASEMASTER6371