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sprinkles08, ASE Certified Technician
Category: Buick
Satisfied Customers: 21436
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Air conditioner works fine and then it doesn't. Yes, dealer

Customer Question

Air conditioner works fine and then it doesn't.
JA: Have you checked the Freon level?
Customer: Yes, dealer added .71 pounds
JA: What is the model/year of your Buick?
Customer: 2004 Buick Rainer
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Have taken it to auto repair shop and a dealers shop. Both say the system checks out OK. I may start it up and drive it 5 or 10 miles. Stays perfectly cool. Let it set 20 minutes. Go somewhere else and it is blowing warm air
JA: Anything else you think the mechanic should know?
Customer: When it first starts in the day is perfectly cool.
Submitted: 3 months ago.
Category: Buick
Expert:  sprinkles08 replied 3 months ago.

Hello and welcome to JustAnswer!

There are many things that will prevent the a/c from blowing cold, it will take some testing while the problem is happening to determine exactly what is going on.

The problem could be with the blend door in the heater box, although that would be unlikely in this case.

The problem could be with the compressor or expansion valve or the compressor could be turning off for a number of reasons. Evaporator temperature, ambient temperature, a/c high side pressure, or lack of request from the control head will all cause the compressor to disengage.

I'm assuming no fault codes are setting. There is a good chance you have a bad compressor clutch coil. It isn't uncommon for a clutch coil to fail and engage initially but disengage as it heats up, even though it is still being powered.

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