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How to know if the ac needs replacement? just

How to know if the ac needs replacement? just makes a whining noise when on

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If it is cooling fine,then have some oil put in the system,to see if it helps,if it does not,it will not be long,and you will need a new ac compressor and dryer,and expansion valve.

Posted on Jul 07, 2010

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gypsycat00
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SOURCE: i have a loud whining noise coming from my ac

The A/C compressor constantly turns because the pulley is connected into the serpentine system. The whining noise is pretty indicative of a low charge in the A/C system. I would start by having your A/C pressure checked and charged if needed.

Posted on Jul 03, 2009

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Ac makes whining noise on a 2004 Pontiac grand prix


Is the whining noise coming from the engine compartment where the compressor is located or is the noise coming from inside the car? If the noise if coming from inside the car it could be your blower. When a blower wears down the bushing is the first thing to wear down and it begins to have play. That makes the blower/fan vibrate making a loud whining noise. Replacing the blower could solve that whining noise.
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normally, the only part of your automatic transmission that will make a whining noise is the pump. it usually whines when iether the fluid is low or more commonly when the transmission oil filter is getting plugged up.

the power steering pump will also make a whining noise too.

turn the wheel all the way to the right and hold steady pressure against the stop. this puts maximum force on the power steering pump and, if the power steering pump is the one making the whine, it will change the sound of it. (usually louder).

if the trans pump is making the whine noise, it should sound different in neutral compared to drive. this test will really only work if it make the noise without the vehicle moving. if it wont do it at idle hold the rpms at 2000 or so.

if you decide the noise is coming from the transmission, and the transmission filter has not been replaced (assuming you installed a used transmission), replace the filter by removing the oil pan.



oh and also, if it is the power steering pump you should be able to make it make the whining noise while the vehicle is stationary. if it wont make noise unless its moving its not the power steering pump.

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I have a loud whining noise coming from my ac compressor. i have a 98 cadillac deville and it makes the whining noise even if the ac is off. it makes that noise the whole time the car is running


The A/C compressor constantly turns because the pulley is connected into the serpentine system. The whining noise is pretty indicative of a low charge in the A/C system. I would start by having your A/C pressure checked and charged if needed.

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1 Answer

When i start up my 98 cadillac deville there is a loud whining noise from the ac compressor. Will my car run without the ac compressor or will i need to spend the money to replace it?


The car should run okay without the compressor, you just won't have A/C. The cooling fans should still operate with the Engine Coolant Temperature sensor. It is also possible that you just need to charge the A/C system. A loud whining noise is indicative of low charge to the compressor.

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It might be your AC compressor. When it makes this sound, turn the AC blower to O or OFF and see if it stops the noise. If it does, then see your local dealer or respected auto AC specialist.

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