Question about 2003 Oldsmobile Aurora

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Hear bearing noise from engine compartment. Changed multiple pullys. Could it be AC clutch bearings?

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Use a long handled screwdriver as a listening device. Put the metal end on the item to be checked and then put your ear on the plastic end of the screwdriver-BE CAREFUL AND BE MINDFUL OF MOVING PARTS AND LOOSE CLOTHING!!!!!

Posted on Oct 04, 2010

Testimonial: "thanks, have tried that. still can't pinpoint noise"

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1 Answer

The AC cooling ok, but has noisy sound.i have replaced the adjusting pully with the belt. and the noise still same,also noticed when AC on it cause load on the engine which i can feel. CAN YOU HELP AND...


it sounds like your ac pump clutch bearing are sezing up they will be noisey and the ac take around 30% effiencey from your engine when on so if the bearing are sezing up that will increase thats why you feel the car has a load on the engine

Aug 29, 2010 | 2003 GMC Yukon XL

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The AC system is making an purge noise not sure if when the compressor kicks on the belt slips or what because it only does it while driving not at idle. In the cab windows up sounds like purge widows down...


If it is a purge noise the highside pressure may be getting to high and relieving pressure.Usually this can occur if there is too much freon or a restriction in the ac system.The defroster utilzes the ac as well which is why you can hear this. From your description it sounds as if the compressor clutch bearing is going bad.

Jul 05, 2010 | 1999 GMC Sierra

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I hear a high pitch sound in the engine compartment that starts when I start the car. With the car still in park, the noise does increase when I step on the accelerator. While driving the noise is in sync...


sounds like you need to replace the idler pully and maybe the tens. pully. and that will solve your sounds problem. whats happening is the bearings are bad and thats what you hear

Apr 06, 2010 | 2005 Nissan Altima

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I have a 2001 dodge caravan, We have a noise coming from the alternator pully, I think or the tension pully, The noise is very loud and kinda sounds like a gragle.


there are a few things you can do to check this ,it sounds like a bearing from the alternator . it is behind the pully ,or the bearing on the tensioner .you can take the serpentine belt of the alternator by usint a pry bar or a ratchet on the belt tensioner .you can check both by spinning them when ther is no pressure on them the one that makes the same noise sound is the bad one ,there is a diagram on the front hood on how to remove and replace the serpiene belt

Nov 19, 2009 | 2001 Dodge Caravan

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I have a high pitched noise which appears to be coming from front right engine compartment (as you are looking at the engine) which sounds kind of like a belt that is squealing. It is intermittent. Just...


Could be several things. WHICH ENGINE?.. 4 cylinder (has three belts, power steering/water pump, alternator & A/C compressor, one tensioner pully A/C compressor), The V6 2.7 (has only one belt, 1 Idler pully and 1 tensioner pully), the V6 3.5 has two belts - A/C/alternator, and power steering - there are two tensioner pullys). Noises can be caused by the belt(s) themselves, pullys, bearings, pully bearings, water pump shaft bearings (or belts/pullys rubbing up against something). Let's not forget that there is also belt(s) behind the Timing Belt cover as well as pullys and bearings associated with the timing system. You could start by removing one accy drive belt at a time (alternator, water pump, compressor, power steering, etc) to see whether or not the noise goes away in each case. If after each case, you discover the noise is still there, it's probably behind the timing belt cover (idler/tensioner pully, water pump shaft bearing, crankshaft bearing, etc.). Good Luck

Jun 29, 2009 | 2004 Hyundai Santa Fe

2 Answers

The car is making a grinding/knicking noise it is


pullys have bearings and the bearings will go bad. what you need to figure out is what pully is makeing the noise and replace said pully. another problem you might have is the power steering pump. check the fluid level to make sure it's not low or dry. when a power steering pump goes bad it makes some noise. another possibale problem is if the car has a/c. the a/c compressor has an internal clutch that will make a grinding noise when it goes bad. To test this start the car turn you a/c on or your defrosters on and listen for the noise in the lower front area of the engine compartment (usually the lowest front pully). shut off the car and look for metal shavings on the pully. for this you should take the car to someone to evacuate the system so you don't release refridgerant into the atmosphere (it is also very flamable) and will need to be oiled with 134a oil and recharged after the repair. hope this helps.

Apr 20, 2009 | 1999 Nissan Maxima

2 Answers

I HEAR A LOUD WHINNING NOISE FROM UNDER THE HOOD


Yes there is a bearing in the AC clutch assembly, and the bearing can be changed with out swapping out for a whole new AC compressor unit or even taking the unit out. 
The other thing to you may want to check is the Serpentine belt tensioner. The tensioner then to break apart and or when the clutch activate put's more pressure on the system and the idler pully bearing could alsy be the problem. 
Spray some water on the fan belt whale the engine is running and see if the noise goes away and comes back as the water dry's. If the noise goes away then it's just a worn belt and need to be changed or you may want to do the quick fix and buy Fan belt dressing. 
Good luck and hope this helps

Apr 09, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Squeaking noise front drivers side of engine


Loosen the belts [ you do not need to remove] so they are free of tension to all pulleys.Start engine , if noise goes away either belts were too loose [ common on lx 450] or you have a worn & noisey pulley /bearing.have seen idler pulley below alternator have dry / noisey bearing.Otherwise if idler is ok it has to be another belt driven assessory , ac clutch,water pump & or fan clutch.Good Luck.

Jan 17, 2009 | 1997 Lexus LX 450

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