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1993 Nissan Trucks 2WD Base Std Cab 5-Spd

1993 Nissan Trucks 2WD
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August 24, 2011, 10:54 am

AutomotiveForums M
 

Question: What would cause loud squealing noise when AC is turned on

sounds like belts are squealling, but could it be something else?


August 25, 2011, 9:31 pm

Ron W
Expert Mechanic

Probably the belt tensioner is failing. When the AC compressor engages, it puts a heavy load on the belt and if the tensioner is sticking, it can squeal VERY loudly. change the Idler pulley at the same time as both have the same age and wear.


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