Thread: chirp, chirp noise when a/c is on w210
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Old 08-29-2009, 07:30 PM
TMAllison TMAllison is offline
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Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
Left side would be the roller, AC and PS pump pulleys. Release tension on the belt and spin the roller and PS by hand and see if they spin freely. The roller has sealed bearings and should be very smooth.

Washing the engine may be the key. Could use a screw driver and try to pack a bit of grease between timing chain cover and the rear of the pivot arm. I've done that on mine before. There is a washer back there so it is impossible to pack it w/o removing it completely. Requires a 17mm hex and some disassembly to remove it. First time took me 90 minutes or more; last time only 18 minutes when the roller pulley snapped off becasue of defective casting.
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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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