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Unusual Airmatic problem

932 Views 3 Replies 2 Participants Last post by  deucer
OK , I have a 2005 w220 s320cdi, I have the common Airmatic .. visit workshop problem... EXCEPT I dont!

The airmatic works fine, the raise car works fine, the different suspension settings work fine, then suddenly the airmatic stops working, pump not cutting in, car doesnt sink so continue driving , carefully. The next day car is started and airmatic fine and so on for a few weeks then is stops again , and so forth. Took to my mechanic the other day as it had been showing fault for a day and half, by the time he started it to sort the problem .. it was working! I have changed the relay to a Hella, and on one occassion I did drop the cover at the front and check the voltage to the pump and 0V ! Thought the control line may have been damaged as it was bent very tightly thro more than 90 deg and cut and resoldered extra cable in place. When I reconnected the 2 plugs pump started working and all was well for a couple of months.
So what , other than the relay , can stop the pump being supplied with the necessary power! Obviously the fuse isnt faulty or it would never work!

Any Ideas greatfully received
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Unfortunately as I said , when I checked before when it wasnt working there was 0V at the power socket! Also if there was a short in the pump I am assuming this would blow the fuse! I have considered an intermittent open in the pump but as there was 0V when it wasnt working even tho the relay was operating ( I had a spare so took the top off and could see it move) I am inclined to think its not the pum!
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