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Expansion valve, location/task/design/function - GF83.40-P-2123GC

MODEL 163 up to 31.08.01, 168 with CODE (580) Air conditioning or Tempmatic for USA 

MODEL 163 as of 01.09.01 with CODE (580a) Automatic air conditioning 

Design 

Fig 1: Identifying Expansion Valve Design
G04608954Courtesy of MERCEDES-BENZ USA
  Expansion valve, location Model 168 GF83.40-P-2123-02GC
    Model 163 GF83.40-P-2123-02GH 
  Expansion valve, task The expansion valve injects the liquid refrigerant into the evaporator.  
  Expansion valve, function   GF83.40-P-2123-01GC