AC Bypass AUX belt for 2011 E350 M272
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Joined: Jul 2024
Posts: 66
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From: Wichita, KS
W212 2011 E350 RWD
AC Bypass AUX belt for 2011 E350 M272
Hi all,
I'm having a weird idle vibration in the engine bay, sometimes it could be felt in the chassis inside the car. Before we go in that route, I have new engine and transmission mounts, I also have new pulleys, tensioner and water pump.
My mechanic told me he'll remove the AUX belt in the morning and check the car. He just called me and reported that removing the Aux brought down the vibrations by 90% inside the engine bay and practically nothing inside the cabin.
This pretty much leaves me with some of the accessories causing some strain on the engine - Harmonic balancer, Alternator, A/C Compressor.
Now, usually when it's cold outside (and the ac doesn't work so hard) vibrations are barely felt inside the cabin, but once it goes over 88F, I can definitely feel the vibrations more pronounced. The car has lived most of its life in Texas, so that means that AC was working overtime.
Alternator pulley spins fine, no noise or anything. Harmonic balancer - not sure how to test it other than checking it visually for shakes or rubber detonation and I don't see such.
I'm trying to find a bypass aux belt, so I can rule out physically the A/C compressor as it's the main suspect for the strain/vibrations.
I've hooked up my Autel 906BT and scanned the A/C compressor - everything looks within margin, refrigerant pressure is within limits (checked here).
My question is, can an A/C compressor cause such strain and aren't there supposed to be more signs that it's dying?
I saw a post for 6PK2310 here but nothing certain.
Another post here for M272/273 - 20 x 2330 to 2340 mm (A011 997 04 92) (this one should be a conti 6K2330)
EDIT:
Asked about the @ECS - no idea
Asked about this @FCP - no idea
Asked about this @AutohauzAz - no idea
Asked about this at my local dealership - no idea - look for something aftermarket.
WDDHF5GB2BA470460
I'm having a weird idle vibration in the engine bay, sometimes it could be felt in the chassis inside the car. Before we go in that route, I have new engine and transmission mounts, I also have new pulleys, tensioner and water pump.
My mechanic told me he'll remove the AUX belt in the morning and check the car. He just called me and reported that removing the Aux brought down the vibrations by 90% inside the engine bay and practically nothing inside the cabin.
This pretty much leaves me with some of the accessories causing some strain on the engine - Harmonic balancer, Alternator, A/C Compressor.
Now, usually when it's cold outside (and the ac doesn't work so hard) vibrations are barely felt inside the cabin, but once it goes over 88F, I can definitely feel the vibrations more pronounced. The car has lived most of its life in Texas, so that means that AC was working overtime.
Alternator pulley spins fine, no noise or anything. Harmonic balancer - not sure how to test it other than checking it visually for shakes or rubber detonation and I don't see such.
I'm trying to find a bypass aux belt, so I can rule out physically the A/C compressor as it's the main suspect for the strain/vibrations.
I've hooked up my Autel 906BT and scanned the A/C compressor - everything looks within margin, refrigerant pressure is within limits (checked here).
My question is, can an A/C compressor cause such strain and aren't there supposed to be more signs that it's dying?
I saw a post for 6PK2310 here but nothing certain.
Another post here for M272/273 - 20 x 2330 to 2340 mm (A011 997 04 92) (this one should be a conti 6K2330)
EDIT:
Asked about the @ECS - no idea
Asked about this @FCP - no idea
Asked about this @AutohauzAz - no idea
Asked about this at my local dealership - no idea - look for something aftermarket.
WDDHF5GB2BA470460
Last edited by georgiuzunov; Oct 10, 2024 at 04:44 PM.
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