Screech at idle with A/C (audio file)
Thread Starter
Junior Member
Joined: Feb 2009
Posts: 45
Likes: 0
From: Eugene, OR
'04 c230 Coupe, '09 SLK 55
Screech at idle with A/C (audio file)
I get an intermittent screech at idle when the A/C is on. Never any time else. Is this the compressor, tensioner, A/C clutch?
Audio file:
http://www.stilife.com/screech.m4a
The screech is at the very end.
Any input is much appreciated before I get flocked at the dealership.
Thanks
S.
Audio file:
http://www.stilife.com/screech.m4a
The screech is at the very end.
Any input is much appreciated before I get flocked at the dealership.
Thanks
S.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Most unpleasant. It's too metallic to be the Poly V belt. It is either the belt tensioner taking strain or you have a compressor or pulley on the way out.
There is no A/C clutch. Benz use a swash plate compressor that runs all the time.
From info provided this is as close as you are going to get. Further narrowing of diagnosis can be achieved with a 6 buck engine stethoscope or by listening with a long screw driver - be careful & don't get either into belt or rotating parts.
There is no A/C clutch. Benz use a swash plate compressor that runs all the time.
From info provided this is as close as you are going to get. Further narrowing of diagnosis can be achieved with a 6 buck engine stethoscope or by listening with a long screw driver - be careful & don't get either into belt or rotating parts.
Senior Member
Joined: Oct 2007
Posts: 260
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From: Los Angeles
05 C230 Kompressor
I have the same exact problem on mines. I posted the same question (what it can possibly be, never did a clear answer). Only happens when the A/C is on and is at idle. Does fine when driving at low or high speeds. ONLY at idle. Mine will dip or rise above 600RPM while the A/C is on. Which leads me to believe is why i have that rough-ish idle issue when the car is cold. After 15-20 mins, the idle stabilizes.
Help? lol
Help? lol
Senior Member
Joined: Oct 2007
Posts: 260
Likes: 0
From: Los Angeles
05 C230 Kompressor
Here are the threads related to the issue. Maybe it can be of some assistance for you:
https://mbworld.org/forums/c-class-w...ble-issue.html (newest thread, this time it's always happening)
https://mbworld.org/forums/c-class-w...ring-idle.html (oldest thread, this one is intermittent like yours as well)
https://mbworld.org/forums/c-class-w...y-when-ac.html (2nd oldest thread, this one is intermittent)
https://mbworld.org/forums/c-class-w...ble-issue.html (newest thread, this time it's always happening)
https://mbworld.org/forums/c-class-w...ring-idle.html (oldest thread, this one is intermittent like yours as well)
https://mbworld.org/forums/c-class-w...y-when-ac.html (2nd oldest thread, this one is intermittent)
Last edited by seagel1000; Jul 10, 2010 at 12:05 PM.
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Joined: Dec 2003
Posts: 3,275
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From: BC, Canada
2003 C230K Coupe Orion Blue
^ For the first 19s I thought I was retarded or something. :rofl: I was thinking "what screech?" You might want to shorten that sound clip.
That does not sound good at all. Let us know how it goes.
That does not sound good at all. Let us know how it goes.
Thread Starter
Junior Member
Joined: Feb 2009
Posts: 45
Likes: 0
From: Eugene, OR
'04 c230 Coupe, '09 SLK 55
Took the car to the doctor today. IIRC they say it's a idle tensioner and a tensioner. The compressor is fine. With parts, total bill is just north of $600.00. Parts will be in tomorrow and fixed as well.
Do they have to take the belt completely off to replace the parts? They said the belt looks great. Should I have the belt replaced anyway?
Thanks for the replies.
S.
Do they have to take the belt completely off to replace the parts? They said the belt looks great. Should I have the belt replaced anyway?
Thanks for the replies.
S.
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Thread Starter
Junior Member
Joined: Feb 2009
Posts: 45
Likes: 0
From: Eugene, OR
'04 c230 Coupe, '09 SLK 55
Got the car fixed today.
It needed a pulley #2712060019 $34.50, a tensioner #2712000270 $138.70 and $455.49 in labor.
The car makes no noise and drives great.
Thanks for the help!
S.
It needed a pulley #2712060019 $34.50, a tensioner #2712000270 $138.70 and $455.49 in labor.
The car makes no noise and drives great.
Thanks for the help!
S.
Senior Member
Joined: Oct 2007
Posts: 260
Likes: 0
From: Los Angeles
05 C230 Kompressor
Member
Joined: Nov 2010
Posts: 129
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From: Ottawa, Ontario
Mercedes C230 2005
Is it possible to just change the alternator pulley? I had mine replaced.. Just wanna see if that's even possible.. Man.. i'm looking at a 12 pack and some angry times
Same symptoms with Ac on... grinding sound.. from what i'm reading i'm gonna replace tens. pulley, idler, i wanna do the water pump pulley and alt pulley if possible.
Any fixes from individuals who had it done?
Same symptoms with Ac on... grinding sound.. from what i'm reading i'm gonna replace tens. pulley, idler, i wanna do the water pump pulley and alt pulley if possible.
Any fixes from individuals who had it done?
Junior Member
Joined: Jul 2011
Posts: 60
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clk w209 200komp
i solve the problem!! i change idler pulley, belt tensioner, belt and alternator pulley, now car is perfect!
problem was caused by seizur of alternator pulley, then belt tensioner go broken and idler pulley was changed for good measure
problem was caused by seizur of alternator pulley, then belt tensioner go broken and idler pulley was changed for good measure
