what causes squealing sound on my 5.7L gmc motor even with all belting removed?

Asked by Apr 27, 2016 at 10:27 AM about the 1988 GMC Sierra 1500

Question type: Maintenance & Repair

Noise was there when I bought truck. Took serpentine belt off and noise is
still there. Makes no difference if belt is on or off

2 Answers

47,765

See if you can determine if the noise is coming from the front or rear of the engine. If front I would suspect something to do with the timing chain maybe rubbing on the timing cover. If at the rear of the engine I would suspect something to do with the starter or flexplate (flywheel). Does the noise change with engine RPM? If not check the heater a/c blower motor.

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I have a 1988 gmc Sarah 1500 I get whining noises when I put it in reverse what is that caused from

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