On a 2003 mitsubishi montero sport w/ 3.0 v6 the a/c compressor belt squeals when you accelrate when you rev the engine you can see the compressor stop momentarily the pressure is perfect and the sight glass is cloudy intermittantly
Your belt is loose (and it just needs tightening) or it is worn and needs to be replaced. It may look ok but they glaze over; all the little ridges get shinny and slip.
I have the same problem-squeeling noise when engine revved,compressor stops intermittantly- went out and bought used compressor-as i took off old compressor ,i noticed belt was worn and missing chunks of rubber.wish i had seen this post earlier
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