Quote:
Originally Posted by Bruce Kennedy
I have tested the aux coolant pumps on three of my mb's and none of them are working. They wont do anything, but the ccu is functioning properly on them all. Are the mb gods smiling on me? I dont want to tempt the gods so I disconnected them for now.
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If the pump doesn't rotate, it usually draws too much current and fries the circuit board.
I bought an aftermarket pump and it lasted 6 months. Then, the monovalve started making some loud and steady knocking sounds.........a clear sign of problems with voltage from the pump. Unplug the pump and the problem goes away. Another example of aftermarket junk.
