Question about 2003 Volkswagen Jetta TDI

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AUXILARY WATER PUMP RUNS ALL OF THE TIME, I CAN REMOVE THE FUSE AFTER TURNING THE CAR OFF AND IT IS FINE UNTIL THE KEY IS TURNED AGAIN, THEN IT WON'T SHUT OFF UNTIL THE FUSE IS REMOVED. IS THE RELAY IN THE PUMP OR SEPERATE?

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This is called an "After-Run" aux pump that is working normally. This prevents fluid residue build up through the cooling system while the engine is shut off. If you'll notice unlike the old style non aux pump system the coolant stays pink in color vs dark brown color with burnt odor. This helps circulate the fluid while the engine is cooling down. Without this the fluid gets cooked from the hot engine block because the fluid is not flowing (water pump shutdown). It will shut down after 10-15 minutes.

Posted on Feb 04, 2010

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Posted on Jan 02, 2017

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