electric auxiliary cooling pump

Brett Dikeman brett at cloud9.net
Tue May 25 22:40:32 EDT 2004

At 9:24 PM -0400 5/25/04, Dan Wing wrote:
>The central plastic nipple on my auxiliary coolant pump broke, 
>puking my coolant. It may have broken because my fan fuse had 
>corroded and burned out, and my fan did not come on, so the pressure 
>in the system got too high, and so on.

These break simply with age.  Well known problem with that type of 
plastic in virtually all VW and Audis of similar age.

>How much difference would this make (nonoperating auxiliary pump) in 
>the turbo cooling?

None.  It only runs with the afterrun fan, which on the 200q20v, is 
very infrequently.

>  As it is, I am restricting my driving to non-boost to keep things 
>nice and cool,

Don't bother.

>  I thought that heater coolant supply was another beneficiary of the 
>auxiliary pump.


>  Some references I have seen indicate that the pump only runs in 
>certain circumstances, anyway.

Correct, and it runs in the opposite direction of normal engine coolant flow.

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin

More information about the 200q20v mailing list