Fwd: Radiator fan switch 2

PAUL WINN paulgwinn at yahoo.com
Thu Feb 5 15:15:35 EST 2004


Subject: Radiator fan switch 2
To: quattro at audifans.com

      Thanks for all of the suggestions from you all.
I am having a problem with my 85 Audi 4000s quattro overheating.  I have replaced the thermostat at the engine and the thermoswitch at the radiator. I've cleaned the terminals at the thermoswitch. Wiggled the Relay, it is clean looking on the outside.  I've replaced the overflow reserve tank cap.  I've noticed that when I power on the car, either when its cold or hot, the idiot light for the temperature Gage/engine-temp-indicator  flashes while the other lights stay constant.
While idling the car warms up as usual till it gets hot enough to set off the thermoswitch for the fan.  It will then cycle on and off for about 10 cycles, keeping the temperature in the normal range.  It seems that at some point the  temperature gets too hot in the engine or in the relay and the cycling stops and  the engine overheats and boils over.  If I stop the car and turn it off, while the car is still very hot, the fan does not continue to work to cool the hot engine as it does on other cars.  I've been told that the radiator may be clogged, but it looks clean, both hoses are hot and when driving the car at speed the coolant temp goes way down, indicating that the radiator is cooling albeit to well.  I'm beginning to think its the relay, but before I change it out, is there another switch, valve, relay, etc or what ever that is regulating or not regulating this problem.

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