i notice a high pitch whine @ 2800+ rpm only with the a/c on. i've read old threads on this but none of them were conclusive. anyone with 03 cls 6mt have the same issue? and is this normal?

 

my AC makes whining noise even when car is idleing in park. It works fine, so I will not have it fixed before there is a problem.

 

Whines big time...hate driving the car with the air on.

 

for a second there i thought i was the only one with this issue. so this is normal? can anything be done to remedy the whine? i'm pretty sure it wasn't like that when i first got it.

 

Have someone check the belt tension and/or replace it.

 

I belive a sign of a bad belt tensioner is not the same (its not whining, its rather clunking noise) ?
My wife's 2000 Honda Accord started is making the same noise..... the noise is on and off (as AC cycles).
I wonder what it is

 

OMG this happens to me also my A/C whines also like it sucks in air and then it stops and i dont know what the problem is also

 

my current approach is to ignore it since I am out of warranty.
I'll wait until it becomes a real problem before I spend $$$ to have someone look at it.
Yes, the noise is irritating, but yet its not clear if this is a serious problem. My A/C is blowing cold air, so I can't complain.
You don't want to go to the dealer, pay $90 for diagnostics to hear something like "can't reproduce" or "your A/C is operating normal".
fuk that....

 

that's an interesting approach... considering the fact that i am out of warranty as well, i might have to do the same. i just wanted to make sure this was not a serious problem and needed to be addressed asap.

 

My car has been whining since I recharged the A/C. Did you recently recharge it? Or any of the other people posting do this?
I came to realize that my A/C usually only whines when I have it on the coldest setting of close to it when it is really hot out.
It was however whining a lot more before I took some of the pressure out of the low pressure line.

 

i have not recharged yet. does it get louder or more noticeable after the recharge?

 

My A/C sounded as any brand new car until I did the recharge myself! I noticed that when I first did it, the engine would sort of pulsate when the A/C kicked on (at idle or highway speeds) and seamed to lose power for a second, but when I lowered the pressure closer to the 25psi (I think I only dropped it back down to around 28-29psi) that was in it before recharging, that it stopped doing the pulsing. Unfortunatly, it still makes a humming/whining sound when it cycles though.

 

Nope - mine hasn't been touched since it came from the factory. Still under warranty so maybe I'll have it checked out next time I am in...