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A heater supply pump is part of the REST system that heats the car when the engine is off. It also supplies heated water to the heater core during normal operation. It is on the drivers side behind the plastic panel just in front of the fenderwell. It is the round part that sticks up and is held on with 4 screws. Open the coolant cap before removing to relieve pressure. It is a motor that drives an impeller on a shaft. Usually the shaft corrodes over time and burns the motor out. Sometimes if it is just squeaking, you can oil the shaft to fix it.
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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K
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