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Reply to "overheating"

what water pump is on the car, stock cast iron or an aftermarket alloy?

some of the aftermarket water pumps do not have the internal bypass pathway machined, this combined with a heater control valve may cause zero coolant flow until the T-stat opens

if there's no internal bypass in the water pump, or if the bypass is deliberately eliminated/blocked some other way the correct T-stat is a mute point
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