water pump not working

[rsweeney 40]

Hi ,

noticed that my auxillary water pump ( although new ) doesnt turn on even after a good run.

i have checked the fuses near the control module and they are all sound.

related information:

i have rexcently fixed one broken wire to the yellow coolant sensor and flushed coolant system.

the coolant temp seems to rise over 90 before fans kick in and then the temp comes down again.

Today i unpluged the sensor and plugged it back in and now it stays below 90 as fans kick in.

Any ideas?

[Vw_owner 1]

have a read , here http://the-corrado.net/showthread.php?38925-The-definitive-VR6-cooling-guide

[rsweeney 40]

cheers thats a good link , going to try this : Fans/pump after-run fault-checking

You can use the following procedure to find out if your yellow temp sender is the cause of no after-run or not. This does not necessarily prove that the yellow temp sender is working, but it will prove if the circuitry that it controls is working or not.

Turn ignition key on, then off again

Disconnect the 4-pin connector from the yellow temperature sender switch

Bridge contacts B, D (brown/red and brown wire)

The radiator fan and auxiliary coolant pump must come on

If NO, check the fan control unit and/or the aux water pump.

[rsweeney 40]

did the test and the fans turn on but not the water pump.

i know the aux pump is good, is it likely to be the wiring to the pump which is broken?

[Lukey. 381]

Test with a multi meter and see if there is power to the plug, test the pump by hooking it up to 12v, then you'll know where the problem is.

[rsweeney 40]

ah yeah will try that on weekend. but could it be the control module ? then one under the coolant expansion tank?

[Lukey. 381]

I would check multiple locations to see if there's a break somewhere