Mercedes vacuum systems
operation and troubleshooting


SHUTOFF

Diesel shutoff

In diesel powered cars shutting the engine off relies on vacuum. Here's how to diagnose and repair a car that won't shut off.


LOCKS

Central locking system

Always vacuum operated in Mercedes. Here's how to troubleshoot and fix it.


HEAT

Flaps

The flaps that control where the heated cabin air is directed are operated by vacuum which is in turn controlled by electronic switchover valves actuated by the heater controls. Here's how to diagnose the heat vacuum.


TRANNY

Modulation

The harshness or softness of shifts in a Mercedes automatic transmission is controlled by vacuum. Click to read more.