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Heater housing position/task/function - GF83.20-P-2110GC

MODEL 163 up to 31.8.01 

168 up to except CODE (580) Air conditioning or Tempmatic for USA 

Shown on model 168 as of 1.03.01 

Fig 1: Identifying Heater Housing - Shown On Model 168 As Of 1.03.01
G04608911Courtesy of MERCEDES-BENZ USA
  Heater housing position The heater housing (1) is located beneath the instrument panel.  
    Model 168 up to 28.02.01 GF83.20-P-2103-01GC
    Model 163 GF83.20-P-2103-01GH 
  Heater housing task   GF83.20-P-2103-03GC 
  Heater housing function Model 168 GF83.20-P-2103-02GC
    Model 163 GF83.20-P-2103-02GH