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Air shutoff valve, location/task/function - GF14.30-P-4028HA

ENGINE 113.990/991/993 

ENGINE 113.992/995 up to Model Year 8 

Fig 1: Identifying Aspirator Shutoff Valve (With Integrated Check Valve)
G07871123Courtesy of MERCEDES-BENZ USA
  Air shutoff valve position   GF14.30-P-4028-01AM 
  Air shutoff valve task When the electrical air pump is switched off (M33), the air shutoff valves prevent the induction of air into the outlet ducts, as a result of the flow of the exhaust gases.  
  Air shutoff valve function   GF14.30-P-4028-02HA 
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