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Originally Posted by brently
I believe the coolant switch is the sensor on top of the housing, above the thermostat, facing the exhaust manny. check the wires coming out of it, there usually fried from being so close to the exhaust manny.
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EDIT: didnt read close enough. Im not sure when there supposed to turn on. I think they turn on after the t-stat opens up, and turns the cooling system into a completed loop. OEM stats open up at 180?? maybe.