cooling fan

Asked by Aug 24, 2012 at 01:48 AM about the 2003 Volkswagen Jetta GL 1.8T

Question type: Maintenance & Repair

Think I need a new mechanic.  Vw overheated and they diagnosed it as the aux or secondary water pump.  I picked
up my car when finished and 10 mins into the drive it over heated again!  I then realized my cooling fans were not
coming on at all...even after running air cond.  So I had it towed back to shop.  Now they are telling me its the
primary water pump that needs replaced and that a faulty water pump causes the fans not to work.  I do not
believe this is true.  What is your opinion?  Thanks   

3 Answers

19,465

Lol, no. If the water pump wasnt working the fans should be going crazy as it overheats. Things to check are ECT sensors, and the fans and wiring themselves, along with the fan relays.

1 of 1 people found this helpful.

If the pump uses a plastic impeller, these often crack and then slip on the shaft, so there is no water circulation, meaning the radiator fans won't come on (since the sensor is nor getting any hot water from the engine), and the motor overheats. The pump will need to be replaced (new one should have a metal impeller, which won't break) EBdR

I just finished changing my fan motors on my 2003 Volkswagen jetta and fan motor still didn't come on but when I turned on AC both fans came on could the wires be crossed

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