Question about 1999 Pontiac Grand Prix

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On a 1999 grand prix you go to turn the ac on and a high pitched squeal is made. barely any air comes out of it.... the isn't cold obviously. what is causing this?

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  • Pontiac Master
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SOUND LIKE BLOWER MOTOR SHAFT BEARING FAILING CAUSING SQUEAK NOISE.

Posted on May 02, 2010

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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.

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Check the ac filter, it might be dirty and thats why it is not blowing out enought cold air. The filter is located under the wiper cover but behind the firewall on the passengers side. You access this by lifting the hood and removing the rubber type gasket that holds both together, right on top of the blower unit.

Apr 24, 2009 | 1999 Pontiac Grand Prix

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