Injector Cooling Fan & Aux. Coolant Pump Update

[quk@sievers.com (Phil Payne)]

In message <970721105146_-2043687577@emout18.mail.aol.com> Audial@aol.com writes:

> The thermoswitch that controls the injector cooling fan apparently is bad.

Common.

> The after-run coolant pump was a little more problematic.  I pulled the
> connector off the pump and connected a multimeter to it.  With the key off,
> the connector reads 11 volts, constantly, engine cold or warm.  Left it
> attached to see if the relay disconnected it eventually...15 minutes later
> (key off), this doesn't happen.  Reconnecting it to the motor, nothing
> happens either, so I suspect the motor is toast.  

According to the factory diagrams, the ur-quattro uses a controller in position 
5 on the auxiliary panel.  On the ur-quattro (don't know about the 5k) the 
panel is numbered oddly:
 
                       13  14  15  16  17  18

                        1   2   3   4   5   6

                        7   8   9  10  11  12

J155 (the after-run controller) is in slot 5.  The whole is also controlled by 
a thermoswitch - F98.

Again, this is ur-quattro - but the after-run coolant pump _always_ has volts 
on it.  The red wire is unfused power that it shares with the injector cooling 
fan.  The other end of the injector fan motor is grounded to chassis simply 
through the thermoswitch that you've found to be defective.  In the case of the 
after-run pump, it's grounded through the controller.

I'd suggest jumpering the red wire in the connector to one side of the pump, 
and jumpering the other side of the pump to chassis ground.  That should tell 
you if the pump's OK.  They don't often fail. 

--
 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club

 (Anyone got a use for a 19mm Allen driver?)