Question about 1999 Pontiac Bonneville

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The clutch on ac pump is making a rattling noise. How difficult is to fix ourselves?

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Will you have to have the tools first second see if they sell a clutch kit for the pump if you have the right tools its easy but they require some skill because the pulley clutch is commpressed on so youll need a specail puller either a 3 jaw or something like that aslo it proably requires you to take the a/c off to do this etc....

Posted on May 09, 2010

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My 01 cougar makes a noise like a pump is going out or is clogged could someone told me it sounds like the ac, but it does it even when the ac is off your thoughts


there are several items running that can produce a noise
the water pump bearing will be a grumble or a tinny rattle , the idler pulleys will be a rattle, the ac pulley is on a bearing separate to the ac operation and is running all the time and the problem noise could be from that bearing
the alternator bearing will make a medium pitch rumble and if you have a viscous ( clutch hub) fan hub the bearings in it will produce a noise
an accredited mechanical shop will have a stethoscope and a good mechanic will be able to determine exactly where the noise is coming from

Jun 25, 2015 | AC Cars & Trucks

1 Answer

What is causing rattling grinding noise at idle especially in my 89 4.5 DeVille?


The technique I always used to identify where such a noise was coming from was to use a very long screwdriver (2 feet long), while the engine is running. CAREFULLY touch the screwdriver end to each pulley or other object under the hood, and put your ear to the handle. The device making the noise will become very clear.

It could be AC pump/clutch, alternator, water pump, power steering pump, etc.

May 20, 2015 | Cadillac DeVille Cars & Trucks

1 Answer

1989 Chevy Silverado 1500 A/C is making a loud rattling noise.


Yes time for a new ac pump it is wore out. Sorry for the bad news but the ac pumps dont cost that much.

May 14, 2014 | 1989 Chevrolet C1500

1 Answer

Hear funny rattling noise by tension spring pulley, replaced pulley but there is still noise. could it be my bearings in ac compressor making noise? do the clutch suppose to move by hand?


yes! you should be able to turn the clutch by hand.run the car,open the hood,have someone turn the a/c on.you should see and hear the clutch engage.

May 17, 2011 | 1998 Cadillac DeVille

1 Answer

On a 1991 olds ciero a non engine external knocking noise. could this be the air conditioner compressor?


A failing AC compressor clutch will make noise more like a rattle but it will become hot enough when it is failing that the rubber grommets around the clutch plate will begin to "stink" as they begin to melt and fall out. It will smell like burnt rubber smoke.

If you remove the drive belt you can try to see if there is play in the pulley for the AC compressor but you won't be able to "engage" the clutch to test it (uses electrical switching). If you can spin the pulley and it makes noise, suspect a failing compressor clutch.

While you have the drive belt off spin the water pump pulley and you should only hear a gurgling noise from water in the motor being pushed and no metal on metal noise whatsoever. If you hear a clunking noise when the motor runs you could also have a worn motor mount so you would want to check those also.

Jul 25, 2010 | 1991 Oldsmobile Cutlass Ciera

1 Answer

Just started having a rattling noise start up. Sounds like something may be loose. The odd thing is is that it doesn't start when I turn on the car, though if I idle or slow down enough it starts up,...


The 2.2 or 2200 four cylinder engine is bad for lifter rattle after the mileage gets up there, timing gears are also noisy in them.. I have had good luck using full synthetic oil, I would buy an engine oil flush kit with the next oil change and then use synthetic, If this noise isnt consistant with engine speed, then i would look at pumps and pulleys on the fron of the motor, sometimes AC pump clutches get squeeky and often rattle when disingaged, try turning the AC or defroster on and of to test for a change in the noise.

Feb 23, 2010 | 2000 Pontiac Sunfire

3 Answers

Ac compressor clutch is making a noise is the clutch is replaceable without replacing compressor


I had the same issue with my 2006. I thought the compressor clutch bearings were faulty. After further research, the rattling noise was actually coming from the serpentine belt tensioner. Easy repair!
Hope this helps.

Jan 28, 2010 | 2006 Jeep Liberty

1 Answer

Repair orepair a/c on 2000 sierra p/u


have you checked the pressure of the refridgerant 134a in it to see thats its at the right prssure because that will kick the ac out if it is too low also have you heard any rattling noises in the engine compartment if so might want to make sure the ac clutch is operating normally because if it is losse and rattling it will lock up the compressor eventually so it might need that to be fixed to make the ac work right

Mar 18, 2009 | 2000 GMC Sierra

1 Answer

Loud noise from 99 Honda Accord


is your ac compressor located on the left side as well and also try your ac if its not blowing to cold the rattling could be your ac clutch on the compressor if that is you will have to get a new clutch kit from your local auto parts store to fix it

Mar 16, 2009 | 1999 Honda Accord

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