E-Class (W211) 2003-2009

4-matic compressor running in reverse only

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Old Aug 14, 2024 | 01:31 AM
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E320
4-matic compressor running in reverse only

I purchased a replacement compressor.And tested it by using A separate Battery. It ran but the air comes out the intake. I can hear the solitude click but it makes no difference. Did I buy a bad compressor or is there something I can do or replace to make it function properly?
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Old Aug 15, 2024 | 06:40 PM
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2010 ML550 VIN WDC1641722A564750, 2010 B180
Im interested in what made you test it. Was it second hand?
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Old Aug 15, 2024 | 09:29 PM
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Originally Posted by BlackML550
Im interested in what made you test it. Was it second hand?
I installed it, ran it and the suspension dropped to the ground so I disconnected the air line, ran the pump and no air was pumping. I then removed it and tested it using a separate battery.
I purchased it on Amazon as a pacage deal with the 2 rear air bags. I didn't think to check to see if it was new or rebuild.

Last edited by Jbrobertsjr; Aug 15, 2024 at 09:32 PM.
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Old Aug 15, 2024 | 09:38 PM
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Originally Posted by BlackML550
Im interested in what made you test it. Was it second hand?
After i installed it an ran it and the suspension dropped to the ground. I then removed it and tested it using a separate battery. I'm now just took the solenoid apart and think the plunger had fallen out of place or might have been installed backwards. I'm now looking for a diagram that shows me which way it goes. I'll let u know if this works
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Old Aug 15, 2024 | 11:21 PM
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I think I figured it out

So realizing that I still had the original, I replaced the old compressor with the new one and it running correctly. I'll install it tomorrow. Fingers crossed.
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Old Aug 15, 2024 | 11:22 PM
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Originally Posted by Plutoe
if what yo say is correct then i would say you have a bad compressor
you are correct, tks.
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