Quote:
Originally Posted by optimusprime
Now you can bypass them , but its there for a job .If mercedes could make the engine run right without the pump in question they would have done .As the auxiliary coolant pump is in there to stop hot spots in the heater system as well as the engine block .Because the main coolant pump on the engine is not efficient to do the job on its own..
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What a steaming pile of bull*****. The Aux pump is there for the sole purpose of boosting the heat output of the heater core. Read the service manual, it even tells you that. The Aux pump is simply a convenience/comfort item. With it bypassed the output from the heater is slightly less and reduces a bit at stoplights or when idling. It has NOTHING to do with cooling the engine.