I am getting noise and vibration from the a/c compressor when it kicks in. I am guessing that the clutch and/or bearings are going out. Can I replace the compressor clutch with replacing the whole compressor? Do I have to remove the compressor to replace the clutch?
Thanks for any help.
My e46 has the air-cond compressor noise too...After spraying some silicon spray for the market it has reduced but it still exists..What can I do?
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Re: Noise from A/C Compressor
Hi,it is allways better to remove the compresor ,do to the lack of room to work on the engine compartment,by what you are telling me it sounds like your compresor is bad you may try to replace the bearing but you may found the compresor on line for the same price with less troubles. good luck.C1
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There are several other things which can make a noise. The people you showed the car have the advantage of hearing or feeling the noise that we do not have a chance to do.
A catalytic noise can change with the engine RPM. You can rev up the engine in Park or Neutral and should be able to replicate the noise. If not, then you have a moving part making the noise.
Sometimes the Emergency brake material comes loose from the metal backing and jams inside the rear drum/rotors. It will cause vibration when pulling away from a stop, and eventually will grind into powder.
Rear axle differential clutches. There are friction disks inside some types of rear-ends. A special lube additive makes these work. Sometimes a refill of additive and lube can make marginally performing units more quiet.
U-joints can make noise and vibrate. Its another moving part noise.
The fan clutch can also make noise and vibration. The A/C compressor and compressor clutch bearing can make noise. The A/C clutch operates intermittently depending on pressure and temperature.temperature.
loose mounts,? frayed belt? noise sounds like what, (scream or rattle)
clutch engaged or now , look and see? or turn it off. and make sure it is off the clutch free spins, OFF.
if off, and noise still, get a new clutch bearing.
if only noise, with clutch engaged that is pump noise
ever heard of a $5 stethoscope at harbor fright.? get one listen to it.
if only the compressor makes noise its bad, end of life.
sure it makes noise , new. listen 1 one other car, to learn good from bad, takes what 5min?
An A/C clutch will not make this concern happen, more likely the A/C compressor is begining to go out. The belt on the A/C clutch Assy. free wheels (spins feree on the pulley) when clutch is not engaged. If concern is not present with A/C off this means the bearings in the puley assy. ok. Once the A/C clutch is engaged it locks the compressor against the spinning pulley and turn the compressor chaft and spins the A/C compressor internal shaft. If you hear a loud "screach" when you turn on the A/C it means the belt slipped for a second, if it continiues to screach it means either the belt is loose or that the compressor is internaly locking up. I wouild start by checking the belt tension (if not equipted with and auto tensioner). You can also remove the belt and turn on the A/C and attempt to turn the clutch/pulley by hand, it should turn with a little effect but should not bind or lock at times if that happens compressor is bad.
This answer is a little tricky to understand unless you read it carefully.
The compressor clutch has an idler bearing in it. This means the clutch can constantly make noise while it turns and the compressor is off. On an individual basis, each bearing is unique by the amount of bearing wear has occurred. Most will be quieter when engaging the compressor in "lock" position, but a bearing missing rollers can be loose in the locked position and be lopsided in how it grips the compressor. The pulley will not roll true or straight to the rotating compressor shaft.
The compressor can make noise separately from the clutch because it needs an internal oil supply for its bearings. There are A/C oil cans and Freon cans with oil in them. Just like motor oil, there are differences in what type of oil the compressor takes. It is relatively inexpensive to add this type of oil to renew the life of the compressor.
When the compressor is turning, the inner pulley will be locked to the front pulley clutch and both pulleys will be turning. If there is a rumbling sound, it is likely the compressor, but try oil first. The compressor is a pump. It is not silent. You can expect to hear the muffled chirping or clicking of internal valving as it forces compressed gas or liquid past the valving. The valving clicks or chirps as it keeps the flow from backing up into the compressor head.
For a time, the compressor will cool as long as it turns and the clutch turns the compressor shaft. If the bearings inside the compressor seize up, it will probably break the serpetine belt. If the compressor clutch bearings fail, they will start making noise both when the A/C is off and when the A/c is on.
Many times a clutch will be changed only to find that the compressor is also bad. It is not a 1 to 1 relationship. A guess would be a 1 in 10 or 20 occurrence. And it is something even the best mechanics may misdiagnose. This is why sometimes a compressor is included as part of the total estimate, a worst case senario.
When the AC compressor kicks on, an electrical load is placed on the alternator and the drive belt that turns the alternator pulley, if not tight enough, can cause the belt to squeal. Replacing the belt should help with that noise if the belt is stretched from wear. The screeching noise can be from a bad idler pulley, a bad belt tensioner pulley or a bad alternator pulley or a failing clutch on a very old ac compressor and rarely a water pump pulley. To check pulleys remove the drive belt and turn them individually to see if they can be tilted up down or sideways with play in the "bearing" of the pulley. Also, you may wish to visually inspect the clutch on the ac and look for melted black rubber around the bolts that secure the clutch to the compressor (stinks,smokes and melts these rubber areas if ac compressor clutch fails).
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.
Yes, look for an aircon technician that can swap a/c compressor clutch without removing the compressor from the bracket. if your lucky enough there are technicians who can do it without even leaking or discharging the gas from your aircon system
try having someone kill the a/c while you check for the noise. if it stops then check further into the compressor where you said you thought it was coming from. It could be the bearings in the compressor clutch going out.