Question about 2001 Chevrolet Silverado 2500HD

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When the AC kicks on it makes a heck of a racket . it sounds like something rattling.

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The a/c compressor itself or just the bearings are going out.

Posted on May 12, 2010


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A rattling noise has suddenly appeared

Hi Graham,
I think you should look at the heat shields often attached to the exhaust, sometimes when at idle they can vibrate and rattle and make a hell of a racket. Have your mechanic take a look at these it shouldn't cost very much if that is the problem

Sep 08, 2017 | Cars & Trucks

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98' Pontiac GTP, When i start my car there is a rattle sound until i turn the ac on. If I do not turn the AC on and just hit the gas it stop rattling. What is it?

where is rattle?under car ,i'm just going to give this a shot , loose heat shields on exhaust system . hope this helps ,good luck

Oct 01, 2012 | 1998 Pontiac Grand Prix

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My car makes a rattling/vibration noise - under the Hood when I am sitting idle at a light or parked (while running) - Only notice it happening when the Car cooling fan kicks on and my Air conditioner...

Airbox is not latched down properly. I had the exact same problem. I found the front of the airbox was clipped down but the back was bouncing up and down and making a racket at low idle. There are 2 clips on the front of the airbox and none on back. You have to put the rear of airbox down first and insert rear into the plastic slots to hold it. Then you put the front down and clip it down.

Jul 19, 2012 | 2006 Scion tC

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Why does my chrysler 2001 town and country lose power when i turn on the ac

Possible damaged A/C compressor locking up. Could also be a faulty Idle Air Control (IAC). It is supposed to kick up the engine RPM when the A/C is turned on. If it is not working properly, you will feel the engine bog down a lot when the compressor clutch engages.

I recommend listening to the pump with a mechanic's stethescope to see if the noise you are hearing is coming from the compressor.

Jun 14, 2012 | Dodge Cars & Trucks

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My 1998 chevy malibu is making a rattling or thumping sound after it runs for a lil while and you can feel a vibration in the floor board. I have been told it sounds like main bearings or possibly an oil...

I don't think a bad oil pump would make that racket. It could be your crankshaft main bearings or rod bearings (also on the crankshaft). If you're sure it's coming from the engine, I would take it to a shop for someone to listen and try to determine what it may be. If it is the bearings, it is major rebuild time.

Apr 05, 2012 | 1998 Chevrolet Malibu

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2004 chevy impala ac compressor is kicked in and full of freon and will not get cold but when the ac compressor starts to make a rattling noise it starts to get cold then it will stop getting cold when...

Sounds like it is clicking in and out which meens its eather low on freon or maybe a bad low pressure switch ? Expansion valve maybe clogged (could be more but too hard to get into?) you do not have orifis tube...hope this helped you?

Jul 27, 2011 | 2004 Chevrolet Impala

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Noisy engine, probably due to tension bearing adjustment?

They can be noisy, my rodeo sounds like a diesel. But, it might be something else, belt tensioners usually only tap, one time every rpm, valves might make more racket, rods sound like a snare drum under neath the car, check the oil, the sound should be coming from the front of the engine. Water pumps, alternators, ac comp, all can be noisy. Turn off the ac when listening. Watch out for the fan. A long screwdriver or a piece of wood with ear against the end will quickly find a noisy part.

Feb 10, 2010 | 2003 Honda CR-V

1 Answer

Does the car make a rattle sound when the flywheel is goin out.

A cracked flexplate (a flywheel is the term for a manual transmissions drive plate) could make quiet a racket and sometimes could sound like an engine knock.

Oct 06, 2009 | Oldsmobile 98 Cars & Trucks

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

Rattling noise coming from front & back

Matt, sounds like a suspension or exhaust noise. Grab onto exhaust (engine cold) at several locations (car supported securely so u don't get crushed) and wiggle, tug pull, kick, etc to see if u can get it to make any noise from hitting anything. Look for evidence of the exhaust rubbing against something, by looking for shiny metal due to contact w/ something. Also push up and down on the body of the car as violently as possible to simulate going over bumps. Pay close attention to heat shields around or on the exhaust system, if they are loose, they will make a racket.
And, as I said, possibly the suspension is making the noise, but not as likely, pushing up and down on the car body as described above might reproduce the noise. If it isn't the exhaust (my 1st choice), give me more clues if u can. good luck countrycurt0

Oct 11, 2008 | 2003 Mazda Mazda6

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