Intermittent A/C

[AngeloUCF]

Anyone have issues with the a/c blowing warm intermittently for 10-15 sec before reverting back to cold? Been happening regularly in my 2021 HC. Out of warranty so no urgency to take it to the dealer but will probably end up there. It’s been hit as hell in Florida not sure if that’s related.

 

[BigdawgR6]

I've been noticing this in my 2022 Denali but wasn't sure if this was after a recent update. Only reason I've noticed it more often was the 100+ temps here in Houston. I would start the car and drive for about 1/4 - 1/2 mile and then it would do just like you said.

I'll have to double check but I don't think I have this issue if I remote start the vehicle and let it sit for about 5 mins.

 

[jjobev]

I have the same in my 2023 Denali. I had an issue in my 2021 Tahoe where it would intermittently blow hot air on really hot days. I would notice when I would go around a curve or stop. Apparently there was a TSB or something for that where there was an issue with fluid levels. It was fixed by dealer but I sold it before the next summer so not sure if truly fixed.

On the Denali I do notice it when the car is parked in sun and when I turn the vehicle.

 

[RST Dana]

The AC issue was fixed with fluid levels? Must have been low on cold air fluid. Otherwise, the word Freon comes to mind.

 

[jjobev]

I found my invoice. GM bulletin N212340500. Notes say AC system was overcharged and that caused the issue. Again, I don’t know if the fix worked. This was done in October 2022 and I sold it in February 2023.

 

[swathdiver]

Anyone have issues with the a/c blowing warm intermittently for 10-15 sec before reverting back to cold? Been happening regularly in my 2021 HC. Out of warranty so no urgency to take it to the dealer but will probably end up there. It’s been hit as hell in Florida not sure if that’s related.

That is generally a sign that the system is low on refrigerant.

 

[AngeloUCF]

Thanks everyone. Maybe the heat has made it low on refrigerant. Never had this issue with last several new cars I bought. And I was just telling the wife how much better the Tahoe’s A/C is than her new BMW lol.

 

[RST Dana]

Thanks everyone. Maybe the heat has made it low on refrigerant. Never had this issue with last several new cars I bought. And I was just telling the wife how much better the Tahoe’s A/C is than her new BMW lol.

If you ceramic tint the windows, windshield included, you can cook it with a cup of ice.

 

[AngeloUCF]

If you ceramic tint the windows, windshield included, you can cook it with a cup of ice.

I actually do have that done already but Florida sun penetrates just fine.

 

[martinajm]

This wont help you, but I had a similar problem in my 1987 Balzer in the late 90's. The clutch on the compressor would stick and not kick on. The solution was to find some bumps on the road or the shift into neutral and rev the engine. The vibrations from either solved the problem 95% of the time. Those were good times!