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Air pump switchover valve, location/task/design/function - GF14.30-P-3103HA

ENGINE 113.990/991/993 

ENGINE 113.992/995 up to Model Year 8 

Fig 1: Identifying Air Pump Switchover Valve
G07871118Courtesy of MERCEDES-BENZ USA
  Air pump switchover valve position   GF14.30-P-3103-01AM 
  Air pump switchover valve task The air pump switchover valve actuates the left and right aspirator shutoff valves when air injection is enabled using vacuum pressure from the intake manifold.  
  Air pump switchover valve, design   GF14.30-P-3103-02HA 
  Air pump switchover valve function   GF14.30-P-3103-03HA