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heat problem

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Old Jun 4, 2012 | 10:00 PM
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heat problem

Ok I have a 97 expedition 4x4 with 150,000 miles on it. I tried to turn the defrost on and I get a a loud squeaking sound It sounds like the ac compresser my question is why would the ac compressor come on when it is on defrost?
 
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Old Jun 5, 2012 | 05:17 AM
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Because defrost uses dry air to combat moisture. Does the same squeal happen when you select a/c? Your thread topic is "heat problem" ?
 
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Old Jun 5, 2012 | 09:20 AM
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yes the noise happens when i select ac too. I seems to happen on every selection except the panel selection. also when i select all other selections besides panel the car bogs down it actually cut off once.
 
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Old Jun 5, 2012 | 09:50 AM
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Either the serpentine belt is stretched to it's limit and needs to be replaced, or the belt tensioner is frozen.
 
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Old Jun 5, 2012 | 11:13 AM
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there is also a rattling coming from the compressor the metal piece on top of the pully is rattling.
 
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Old Jun 5, 2012 | 12:01 PM
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Originally Posted by expguy121
there is also a rattling coming from the compressor the metal piece on top of the pulley is rattling.
In that case get yourself a compressor pulley kit.
Expedition/Navigator A/C Compressor Clutch Kit CL 0542C | eBay
 
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Old Jun 5, 2012 | 12:03 PM
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Thanks for all ya'lls help!
 
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