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Originally Posted by j.fro
So 216 is not good. Any thoughts on the solution? Do I need to add a center radiator to the car? The car has 88k miles and I believe the water pump is original (and coolant). Is this a sign the impeller is going?
If this is dangerously hot, any thoughts on why Porsche didn't put the center radiator in all cars? Or why the idiot light doesn't come on until much hotter (250)??
FWIW, in my 986 which runs much cooler, I did an old V8 hot-rod trick: I drilled a 1/8" hole in the T-stat plate so that there is always some coolant flowing. I know the Porsche system already has a bypass in the heater system, but it seems to be part of the difference.
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Adding the center radiator will give you higher heat transfer capacity, which will change the rate at which the engine sheds heat, but not its steady state temperature. That is controlled by the thermostat.
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