Steve especially, Your test verified that coolant is circulating, your new fan switch works, and that your temperature gauge seems OK. However, in an earlier post, you mentioned a running temperature of 160 degrees F. That's too cool. In fact, that is why I rambled on before about either an engine thermostat (not fan thermostat) problem, or, since you have a transplant, an error in the plumbing of the heater and coolant hoses. I believe that you still have a problem. Greg especially, The temperature gauge reports the engine temperature. As long as the water in the circuit is below the thermostat temperature, the engine runs at its usual 190 degrees F. However, at a prolonged idle, the whole cooling circuit just keeps getting hotter because there is no cool water available from the radiator part of the circuit. No airflow, no cool. Eventually, when the whole system gets to 200+ degrees F, the fan thermostat on the radiator turns on and hopefully prevents any further increase in temperature. However, after a few degrees cooling, the fan shuts off because the radiator temperature has fallen below the fan thermostat's off temperature, and the cycle starts over. Thus, the way to bring the engine back down to normal is to turn it off, or to drive. That's the design. Mike
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