Question about 1999 GMC Yukon
Rear fan motor could be out. Check voltage at the REAR switch when its use is enabled by the front switch.
Posted on Jan 07, 2009
Does the A/C work okay fromn the front? IF so make sure the front control is set to allow the rear controls to be in charge. If not happening I would check the front panel switch and make sure it is allowing the voltage back to rear controls when in on "rear" position. If A/C does not work at all from front or rear, then you may not have enough charge to allow the system to cycle. System should have 2 lbs 12 ozs (44 oz) of R134a installed.
Posted on Jul 15, 2008
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Posted on Jan 02, 2017
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