Auto Check Diagnostics Question

[Ti Kan]

Dan Cordon writes:
> FYI, I'm playing with a 1987 5kcstq.
>
> I was hoping someone could help me with an Auto Check problem. I had the
> coolant warning signal come up recently. It's supposed to indicate low
> coolant or coolant too hot. I have neither of these conditions. It
> happened yesterday and comes on consistently after starting the car up.
>
> So far I've checked the coolant level sensor, and that checks out okay.
> However I can't seem to locate the coolant temperature switch for the
> Auto Check. I have the Bentley, but I can't seem to make sense of the
> coolant sensor location. So far I've located two single wire sensors
> (one on drivers side by front cylinder and one on the thermostat
> housing), one two wire sensor on the thermostat housing, and the
> thermotime switch. Any idea which it is, if any?

The auto check on your model gets its coolant temp info from the
multi-function thermo sensor, located under the upper radiator hose
flange of the cylinder head.

-Ti
2003 A4 1.8T multitronic
2001 S4 biturbo 6-sp
1984 5000S turbo
1980 4000 2.0 5-sp
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