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           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.
           
            
  
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           LOCKS
            
           Central locking system
            
           
           Always vacuum operated in Mercedes. Here's how to troubleshoot and fix it.
           
            
  
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           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.
           
            
  
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           TRANNY
            
           Modulation
            
           
           The harshness or softness of shifts in a Mercedes automatic transmission is controlled by vacuum. Click to read more.
           
            
  
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