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PTC heater booster, location/task/design/function - GF83.70-P-4058T

MODEL 211.0 with ENGINE 271, 628, 629, 642, 646, 647, 648 

MODEL 211.2 with ENGINE 271, 642, 646, 647, 648 

MODEL 211.6 with ENGINE 642, 646, 647 

Fig 1: Locating Heater Booster
G07265846Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
PTC heater booster, position The heater booster (R22/3) is located in the air conditioner housing upstream of the heater heat exchanger.  
PTC heater booster, task Compensates for loss of heater output under certain operating conditions (cold start, partial load, etc.), in particular for direct-injection diesel engines. The heater booster (R22/3) supports the task of the heat exchanger.  
PTC heater booster, design The heater booster (R22/3) comprises a heating register with seven PTC heater sections and a power regulator.
A PTC section comprises several ceramic heater elements with a metallic frame.
To increase the area, the metal frame is equipped with ribbing.
 
PTC heater booster, function   GF83.70-P-4058-01T