weird noise when ac running?
Thread Starter
Junior Member
Joined: Dec 2009
Posts: 62
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From: King Of Prussia, PA / Williamsport, PA
Year: 1998
Model: Cherokee
Engine: 4.0 I6
every time i turn my ac on it makes a whining noise, then when i starting giving it gas, the noise gets louder. not really sure how the whole ac system works. any one have this problem or know what it is? thanks
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
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From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Could be your wallet? :P
Like Turbo XJ it sounds like you mean belt squealing. Does it make this noise any other time? Say, after it rains, if the battery is low, or if it sat for a while.
The AC compressor is driven by the same belt as the water pump, alternator, fan, and power steering. Between the compressor itself and the pulley with the belt is a clutch that engages to send power to the compressor every time you turn on the AC.
Like Turbo XJ it sounds like you mean belt squealing. Does it make this noise any other time? Say, after it rains, if the battery is low, or if it sat for a while.
The AC compressor is driven by the same belt as the water pump, alternator, fan, and power steering. Between the compressor itself and the pulley with the belt is a clutch that engages to send power to the compressor every time you turn on the AC.
Thread Starter
Junior Member
Joined: Dec 2009
Posts: 62
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From: King Of Prussia, PA / Williamsport, PA
Year: 1998
Model: Cherokee
Engine: 4.0 I6
it does sound like a belt, but someone told me that it cant be cause the ac has no belt..knew i wasted crazy thanks
CF Veteran
Joined: Dec 2010
Posts: 1,246
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From: Missouri
Year: 1998
Model: Cherokee
Engine: I6 4.0 L
How well does the ac work? Is it cold? Mine squeals too, and my ac has gotten worse. If his compressor isn't running very well, might he not have cold ac?
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CF Veteran
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From: Kansas
Year: 1994
Model: Cherokee
Engine: 190-hp, 4.0-liter I-6
CF Veteran
Joined: Feb 2012
Posts: 2,652
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From: Kansas
Year: 1994
Model: Cherokee
Engine: 190-hp, 4.0-liter I-6
Well the only reason im sure there is, is because when my tension pulley went they asked if I had a/c to get me a new one because the belt wraps around something to do with the a/c. But they could have been wrong and I could be looking like an idiot right now haha
CF Veteran
Joined: Dec 2010
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From: Missouri
Year: 1998
Model: Cherokee
Engine: I6 4.0 L
Originally Posted by Cherokeekid4x4
Well the only reason im sure there is, is because when my tension pulley went they asked if I had a/c to get me a new one because the belt wraps around something to do with the a/c. But they could have been wrong and I could be looking like an idiot right now haha

CF Veteran
Joined: Feb 2012
Posts: 2,652
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From: Kansas
Year: 1994
Model: Cherokee
Engine: 190-hp, 4.0-liter I-6
CF Veteran
Joined: Dec 2010
Posts: 1,246
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From: Missouri
Year: 1998
Model: Cherokee
Engine: I6 4.0 L
Originally Posted by Cherokeekid4x4
Well the belt spins with the motor, it wont stop when the a/c is off.
If you notice with the engine running the compressor pulley is actually 2 parts. When the compressor is not engaged the center portion is stationary, when engaged "click" it rotates.
CF Veteran
Joined: Feb 2012
Posts: 2,652
Likes: 2
From: Kansas
Year: 1994
Model: Cherokee
Engine: 190-hp, 4.0-liter I-6
. Maybe the belt keeps it going all the time, but when you kick on the a/c it will allow the belt to transfer the power threw the compressor and start the a/c.



