wardy988

I have a 96 S10 Blazer 4dr 4wd. When i turn the heater or a/c or blower on, it produces a high pitched squeel. happens no matter what the dials are set to. is there a belt that runs the blower for the HVAC that needs replacing or could this be something more serious???

MT-2500

The blower mortor is all electic motor.
Does the squeal change with different blower speeds?

Does engine speed change squeel like a belt slipping?
Have you tryed unplugging the AC compressor?

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Remember proper testing gives us the answer to many problems.
MT