A/C blowing hot

Tiny
BEN KOPICZ
  • MEMBER
  • 2007 CHEVROLET IMPALA
  • 3.9L
  • V6
  • 2WD
  • AUTOMATIC
  • 103,000 MILES
I have done the following:
Replaced the fuse.
Replaced the relay.
Had it professionally recharged.
Confirmed the compressor is spinning.
What else can I check or have checked?
Sunday, July 14th, 2019 AT 7:55 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome to 2CarPros.

If the compressor is engaging, the system is properly recharged and both high and low side pressures are correct my first suspect is that the blend air door actuator isn't operating. This actuator opens and closes a door which either allows heat or A/C to enter the vehicle. If it is stuck, it may be blocking the cool air from entering.

Your vehicle has dual zone climate control, so if you are not getting A/C from either sides of the vehicle

If you look at pictures 1 and 2, it shows how to replace the actuator for the left side. Pictures 3 and 4 are for the right side.

Let me know if this helps or if you have other questions.

Take care,
Joe
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Sunday, July 14th, 2019 AT 8:58 PM
Tiny
BEN KOPICZ
  • MEMBER
  • 2 POSTS
I am sorry I forgot to mention. About three months ago I replaced two air door actuators. The one under the steering wheel and the one behind the glove box.
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Sunday, July 14th, 2019 AT 9:01 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome back:

If the actuators are working, then I will need to know the high and low side pressures of the system. Additionally, I need to know the outside temperatures when the pressures are read.

Here is a link that shows what is needed to access those pressures. It is called an AC manifold gauge set. In the link, they are being used to demonstrate how to vacuum and recharge a system. In your case, I just need to know the pressures.

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

The reason I need the pressures is simple. If the actuators are allowing air to enter the vehicle correctly, then the evaporator (which is under the dash) isn't cold. That can be caused by several things. If I knew the pressures, I could tell you if there is something wrong with the system. If it was working correctly the evaporator would be cold, and if the actuators are working correctly, you should be getting cold air pushed into the vehicle..

Let me know.

Joe
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Sunday, July 14th, 2019 AT 10:16 PM

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