my engine doesn't even really seem to be getting too hot - i mean i let the car idle and it goes up to 100c pretty quick, cold air blaring out the vents. any other ideas? where does the temperature gauge take its reading in the system?

i am losing coolant somewhere, but i don't see it leaking out anywhere. its possible the reservoir contents blew out through the overflow on that short trip home a few days ago.

what else could it be?

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1984 300D "Brown (and Blue) Betty" Over 200k but the odometer isn't counting