over heating
At low RPM or idle, temp gauge goes up and heater goes cold. Once you bring RPM's up, it immediately cools and runs normal. This does not happen all the time. Car will run normal for a week, then all the sudden it happens. Fans seem to be cycling normal. It almost appears that the water pump stops pumping. Coolant levels are normal and the radiator exchanges with overflow as normal. Car has new radiator, thermostat and block has been flushed. No head gasket leak. Any ideas? Driving me nuts!