Hey...

I just picked up my fathers new 1992 300D 2.5 turbo.
Two things that I see wrong with it and I need your opinions on it if possible.

When I preglow the car the glow plug light does not come on at all. It only comes on after the car is turned on. It will stay lit for about 1-2 minutes. Any suggestions ?

The car runs at 80 Celcious all the time except when I am at a stop. Air conditioning is off as well. Should I just flush the system or change the thermostat ?

Thanks

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Audi TT