03 Yukon Denali heate/ac squealing noise - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-21-2015, 02:28 AM   #1
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Default 03 Yukon Denali heate/ac squealing noise

When I have my ac on or heat on it makes this squealing noise. When I turn it off no noise. Could it be my belt I know there is two. The second belt I thinks runs the ac compressor. Is there a pulley for the ac compressor.
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Old 12-19-2015, 11:36 PM   #2
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I took it to my mechanic and he said it'* the bearings in the ac compressor unit and that the whole unit is needed. But I had an issue with my temp staying in the cold no matter how long I had the truck running. So it happen to be my coolant temp sensor change that and now the temp is where it should be. I notice when I turned my air on, no more squealing Noise or anything. I don't no its weird see how long that stays that way anything I change on this truck is cause it'* very old and with 176k anything can go wrong
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