Question about 2001 Mitsubishi Montero Sport 4WD

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Whenever I turn my AC or Heat on in my car, I hear a loud squealing or grinding noise...

When i turn the ac or the heat on a get a squealing noise

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Sonnds like a loose belt. Your AC compressor activates in both positions and puts a load on your engine from having to turn the pump. If belts are tight, not over tight, apply some belt dressing to them while engine is running. Please be aware that the engine will be running and stay clear of moving parts..

Posted on May 22, 2009

  • yolanda
    yolanda Mar 02, 2014

    what is a belt dressing

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This is because your bearing in the heater motor is going out. if this is driving you nuts then you will have to replace the blower
hope this helps you

Posted on May 22, 2009

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