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'91 200q turbo cooling pump question
In message <email@example.com> firstname.lastname@example.org (Phil Payne) writes:
> In message <email@example.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.
Committee Member, UK Audi [ur-]quattro Owners Club