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I replaced the coolant-temp switch that controls the after-run coolant pump and radiator fans (circulates coolant through the turbos and runs the electric radiator fans slowly to circulate air through the engine compartment after engine shutdown) with one that closes at a lower temperature.
Before the conversion, the pump almost never ran. Now it runs for a minute or two after almost every shutdown. I noticed after the switch that the coolant temp doesn't rise after shutdown. Previously if I restarted the car after a few minutes, the coolant temp would be higher than operating temperature. Now it stays at operating temperature.
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