electric auxiliary cooling pump

[Brett Dikeman]

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.

No.

>  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.

Brett
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