Question about Ford Mustang

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Compressor make noise

When I turn my 1997 ford mustang off, There is a high pitched squealing noise. I have been told it is coming from the ac system but can't find it. Any ideas?

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  • Ford Master
  • 14,036 Answers

Check AC compressor belt could be slipping.

Posted on Jul 09, 2013

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SOURCE: noise from front of motor

Yes the idler pulley can make noise, but not very common. It can do it though.

Posted on Jul 24, 2008

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SOURCE: Squealing noise in 2002 Nissan Sentra

Seems like a drive belt problem, to confirm pour some water on belts the noise should go away or may get louder for a second. If either happens the belt or belts needs to be adjusted or replaced. Good Luck, If I fixed ya, leave me a FIX-YA comment thanks

Posted on Dec 18, 2008

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SOURCE: high pitch whistling noise in engine compartment of 2005 envoy

There may be a small hole or cut in a vacum line or possibly just loose. Also make sure the air filter box and the big hose to it are secure and clamps etc are tight. Pulleys and belts can make a high pitch sound also.

Posted on Mar 22, 2009

  • 7 Answers

SOURCE: There is a squeal sound (high pitch) coming out of

The seal on the AC compressor has probably failed and allowed all the refrigerant and lubricant to be lost. This allows the bearing to run dry and now it is failing and making noise.

1. You could have the AC repaired, the compressor repaired or replaced and the system refilled.

2. You could have a mechanic disconnect the system and possibly remove the compressor (only if this model does not use a belt that relies on the compressor being in place).

3. It is probably way too late to try to refill the AC system with R134a refrigerant as it would just run out past the failed seals.

If anyone has an AC unit that just recently stopped making cold air they should attempt to recharge the unit (if it uses R134a - check your manual or underhood stickers). I just did and saved my compressor and AC unit from further damage.

Posted on Jun 17, 2009

  • 3 Answers

SOURCE: high pitched squealing noise when i start engine

One of the belt should be loose or worn. Make sure they are not worn or cracking before tightening.

Posted on Jun 23, 2009

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There is a squeal sound (high pitch) coming out of


The seal on the AC compressor has probably failed and allowed all the refrigerant and lubricant to be lost. This allows the bearing to run dry and now it is failing and making noise.

1. You could have the AC repaired, the compressor repaired or replaced and the system refilled.

2. You could have a mechanic disconnect the system and possibly remove the compressor (only if this model does not use a belt that relies on the compressor being in place).

3. It is probably way too late to try to refill the AC system with R134a refrigerant as it would just run out past the failed seals.

If anyone has an AC unit that just recently stopped making cold air they should attempt to recharge the unit (if it uses R134a - check your manual or underhood stickers). I just did and saved my compressor and AC unit from further damage.

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first thing to do before you charge it again replace the 'O' rings in back of the compressor also add some a/c oil because that will help the a/c compressor not to rattle this is the way I do mine I put in a can of 134A first and after that I put in the 134A oil and then I put in the rest of the 134A that is needed
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