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928 S4 cooling:

Engine

Vehicle Information: Year: ss; Engine (size, modifications): ss; Total Mileage: ss;

My 1987 928 S4 seems to be running a bit hotter, in similar conditions, than it used to. Ive replaced the coolant using the proper phosphate-free long life formula, and the water pump, pressure cap and radiator checked out favorably, yet the cooling capacity seems to still be getting a little worse. What could this be?

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