Question about GMC Yukon XL

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My ac compressor suddenly stopped working. It makes a horrible sound like its not turning. Could this be low freon not allowing it to turn on, or the compressor is finished??

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Hi there,if it is making a mechanical grinding or any other loud noises,its finished.Does this have rear ac.If it does,there is a design flaw on some years.The rear suction hose(rear evap core to compressor)bypasses the drier.This allows some moisture to make it back to the comp.I hope this was helpfull..Good Luck!!!

Posted on Aug 04, 2008

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I'm tryin to find out if my a/c compressor is out. So I know that the dealer said that I need it charged and I didn't get it done. So lately it has been makin a loud noise and rattlin on the...


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1 Answer

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Compressor will not engage



Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.

If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.

The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.

The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon
and fill to system capacity.

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The system should be filled until suction pressure is about 30 to 38 psi..

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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.

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