'91 200q turbo cooling pump question

[quk@sievers.com (Phil Payne)]

In message <137906@sievers.com> quk@sievers.com (Phil Payne) writes:

> In message <970324161921_887247861@emout08.mail.aol.com> C1J1Miller@aol.com writes:
> 
> > I was under the impression that there should be an electric pump circulating
> > water by the turbo after shut-down; haven't heard it yet.
> 
> It's fairly quiet.
> 
> > Is it thermostatically run?
> 
> No.  It's a timer.

Since so many people have commented ...
 
Check the circuit _carefully_.  On the MB engine, the pump is controlled by 
J155 switching relay J26 (diagram 39, tracks 34-39).  The thermoswitch does not 
control whether the pump runs or not - it provides an alternate source of volts 
when the ignition is off.  Bridging the contacts of the thermoswitch will _not_ 
necessarily make the pump run - unlike the cooling fan.
 
J155 is essentially a timer.

Although the 200T might well be different ...  as might the next MB Audi built.

--
 Phil Payne
 phil@sievers.com
 Committee Member, UK Audi [ur-]quattro Owners Club