Mercedes-Benz E350 Problems

Airmatic Pump Motor May Fail Due to Sticking Relay on Mercedes-Benz E350

Problem Description and Possible Solution

The relay which turns the airmatic suspension pump on may fail causing the pump to run continuously. This can result in failure of the pump motor or a dead battery as the pump motor will continue to run after the car is turned off. Also, Worn airmatic pump mount bushings can causes noises in the front axle while driving on bumpy roads or a buzzing noise while the pump is running.

(18 people reported this problem)

Mercedes-Benz E350 Vehicles With This Problem

RepairPal Verified
Average mileage: 65,028 (15,000–143,545)
5 model years affected: 2006, 2007, 2008, 2009, more2010
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Viewing 1-7 of 7 comments
Turned off the car and had a noise coming from the engine. Pulled the wire off the Airmatic Pump noised stopped.. Going to look at more when car cools down
I got in the car morning of 6/18 battery was dead. I had been hearing the winning when I would take cornes and when I would turn off the car. I thought I should maybe change the relay first to see if that fix the problem and then maybe the airmatic pump, but nobody mentions were these are located I bought the car used 2 months ago. I love the car but I can't afford expensive repair bills please help I'd like to do it myself. Thanks for any advice
Problem: The Air Pump relay sticks.

Symptoms: Whining noise and the car won't start.

SOLUTION: I fixed it with a hammer! I banged on it (Not too hard) around the sides of the pump and tried starting it again. The car started perfectly and sounded normal.

Cost to Fix: $0.00 :)

Dead battery would easily jump start took to dealership unable to find source of draining. Charged battery no longer a problem been 2 wks. After washing car last week heard sound of air discharging near front tire for a few minutes intermittingly figure it could be this suspension issue. the sound I heard makes sense. Now have check engine light on will bring to dealer to read code and will dicuss the suspension issue.
Heard the weird noise near the right front tire after the car was off. The NEXT time I started the car, the malfunction message was on. Car runs perfect, drives smooth-no issues at all. Shocked that the average mileage of this issue is the EXACT same as mine. Wondering how much THIS will cost to fix.?