88 5kcstq coolant warning problem (neither sensor!)

Huw Powell audi at humanspeakers.com
Mon Apr 19 23:57:18 EDT 2004


> My '88 5kcstq is flashing the coolant warning light.  Problem is,
> when I disconnect both the expansion tank level sensor and
> multi-function temp sensor, the warning doesn't go away.
> 
> My understanding is that those are the only two sensors that can
> cause the warning light to come on, and that by disconnecting them
> the system should default to no signal.  The expansion tank is closed
> to ground when the tank is low, and the overheat signal is also
> closed to ground.  So by unplugging both, I should not have the
> flashing light.
> 
> What am I missing?

A shorted wire in one of those circuits?

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/


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