Heater Cores and Blower Fans
Mazda Millenia

What causes a 1998 Mazda Millenia 2.5L to overheat and run rough while driving but at idle it overheats after a period of time but not when the blower fan is on high and the radiator fun is on?



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The problem you seem to be having is the cooling temp sensor. It controls the fan speed which has two speeds. Try that.