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Stan, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3526
Experience:  Technical support engineer
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Vaccum pump runs seconds every 4 minutes even when car

Customer Question

Vaccum pump runs for several seconds every 4 minutes even when car turned off. 95 S320. Lumbar bladders are blown and door close assist dont work which i dont care about. Is there any problem i'll have wit the car's running by just unplugging the pump?
Submitted: 1 year ago.
Category: Mercedes
Expert:  Stan replied 1 year ago.


The vacuum pump is also used for central locking. It might make sense to plug up the lumbar system vacuum connections on the pump, so that the pump would build up the vacuum there. But usually, the leaking connections are deactivated by the pump automatically if leak is detected. So it might be that vacuum pump is too weak and not building up enough vacuum, which will cause it running constantly.