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David
Lv 4
David asked in Cars & TransportationMaintenance & Repairs · 4 years ago

Ram 1500 squealing noise when AC/Heater turned on?

I have a 2009 Dodge Ram 1500. The truck has been making a squealing noise upon startup and will squeal continuously very loudly. The squealing will sometimes stop when I give the accelerator pedal some gas or actually start driving. The belt doesnt appear to be loose and in fact I can t even move the belt by hand unless I also give the tensioner a good pull too.

One thing I noticed is that when the blower (for heater and AC) is turned off that the squealing will stop. I can even start the thing with the heater/AC off and there will be no squeal.

Anyone have an idea on what it might be?

2 Answers

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  • ponderer
    Lv 6
    4 years ago
    Favorite Answer

    I am thinking the compressor has too much resistance causing the noise. But if it is in the heater mode then the defroster would have to be on if that is the case.

    Another possibility is the blower is drawing enough amps to cause the alternator to strain and make the belt slip. Or the belt is glazed at 8 years old and it needs a belt and tensioner. Or the waterpump is dripping on the belt.

  • thebax2006
    Lv 7
    4 years ago

    Fix your damn drive belts since you know they are loose.

    Source(s): Mitsubishi Master Tech
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