Passenger and rear A/C blowing hot

SOUL2FLY7

MEMBER
2014 GMC ACADIA
V6
80,000 MILES

Driver side blows cold while the passenger side and rear blow hot. My blend door looks to be actuating normally. Another thing I noticed, the driver side does blow hot sometimes and then I recharge the A/C line then it's back to normal for a few days. Then it's repeats. Not sure if it's related.

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon,

The first thing you need to do is have the Freon system checked. You have a leak and that may be the entire issue.

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

https://www.2carpros.com/articles/air-conditioner-leak-detection

You need to add dye to the system and use a bright LED light to locate the leak. Once it is determined, repairs need to be done and then the system is evacuated and charged to the proper level.

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

This is where you start.

Roy

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Saturday, July 31st, 2021 AT 12:15 PM

SOUL2FLY7

MEMBER
3 POSTS

Thanks Roy. Sorry, I should have given this detail originally. The last recharge I did was R134a with dye. Ran the UV light at night on all the lines, fittings compressor, and condenser. I can't easily get to the rear or front evaporator coil to check tho. Didn't see anything. Of course I could have missed something.

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Saturday, July 31st, 2021 AT 3:28 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Yes, you did. Freon does not just go away. It leaks out and that leak needs to be found and repaired.

How much Freon did you add?

Roy

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Saturday, July 31st, 2021 AT 4:41 PM

SOUL2FLY7

MEMBER
3 POSTS

If "Freon does not go away" why does how much I added have anything to do with it? Do you want me to weigh the can before and after next time?

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Sunday, August 1st, 2021 AT 1:13 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

The system requires an exact amount in order to work correctly. When it gets low it comes from a leak.

You need to recover all the Freon, evacuate the system for 45 minutes and add the exact amount required for the system. Then you test the pressure to see if the system is working correctly.

Roy

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