Question about 2003 GMC Yukon
Could be the expansion valve. That's what allows the temperature to actually drop in the system - the contents of the AC system are under pressure, and are at a certain temperature. When the freon goes through the expansion valve, the pressure drops suddenly and dramatically, which "flash chills" the freon, allowing the air to blow cold. If it fails, you may get lukewarm air from the AC despite everything else working. Also though, check to see whether the AC evaporator fan (underhood) is working - on some cars, if it doesn't turn on, the compressor won't be run enough to cool the air.
Posted on Jul 29, 2008
Just wondering how long ago did your problem start was ac working normal as the other tech said low freon if the system has trapped condensation and air should be dryed refilled
Posted on Sep 11, 2008
You are probably low on freon. Usually when your a/c unit is low on freon, the compressor will kick off, but, your car may not do that. You can have it the freon checked at any local repair shop. I have a '99 S10 blazer, and my compressor won't even kick on, so I know that the compressor is bad.
Posted on Jul 29, 2008
Too much pressure in the ac system is just as bad as not enough pressure... to much pressure can actually stop the ac compressor clutch to not be able to disengage therefore ending up burning out the compressor... start off with checking if the compressor is engaging then if it is bleed off some of the pressure until its in the proper range... if that still doesn't solve the issue you may have some moisture in the system and will therefore need to have the whole system vacuumed out and replace the drier then recharge the system.
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Posted on Jan 02, 2017
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