[urq] Sensor P/N that triggers the coolant warm-up light?

[Renneisen, Eric 475]

I'd like to get the green warm-up light working on my car. The two-pin
switch in the upper coolant flange when I bought the car was black, and
the light never came on. I verified the wiring and bulb by grounding the
wire.

So, ETKA said I needed 049 919 501B (white). I ordered one and installed
it. Now, the green light begins to glow as the engine temp rises,
exactly opposite of what it's supposed to do.

I don't see any other P/N options in ETKA. Is this the right number? Did
I just get a bad one?

Eric R.
'93 S4
'86 urq

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