A/C randomly blows hot air?

SSLUNA

MEMBER
2004 GMC YUKON
5.3L
V8
2WD
AUTOMATIC
300,000 MILES

A/C randomly blows hot air. Sometimes it works perfectly. Really cold air from all vents and then all of a sudden it starts to blow warm air and after a few minutes it is blowing really hot air. After a while I can turn the A/C back on and it will be cold again. Sometimes turning off the vehicle waiting a little bit then restarting seems to make the A/C work correctly again?

Thursday, May 29th, 2025 AT 6:46 AM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

Okay, so this can be one of two problems, so we need to look at the compressor clutch when the system starts to blow hot air. Open the hood and use a flashlight to see if the clutch is spinning on the front of the compressor. If not, I have seen the clutch coil start to go bad and disengage.

Here is a guide to help:

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

If the clutch is turning, then I would replace the temperature blend door actuator which you can do by following this guide:

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

Please go over these guides and get back to us. Please upload pictures or videos in your response.

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Thursday, May 29th, 2025 AT 12:46 PM