Question about 1997 Pontiac Sunfire

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Have a 95 Pontiac Sunfire. Bought car with blown headgasket (replaced) in the process aqua locked an injector (replaced) and also replaced the thermostat. Currently have cooling far wired to a Toggle switch as it didnt seem to kick on properly. Here is my problem. While driveing the car the temp reads about half, normal zone but then after a while of driveing and with the heat range still in the normal i stop the car and it shuts down from overheating (the temp gague never rises over half way) thinking either clog in radiatior or water pump might be bad as with the temp sensor. what do you think?

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Keep it simple, try flushing out the cooling system with Preston radiator flush, just follow the instruction on the bottle and replace the coolant with a 50/50 mix. Note that the orange antifreeze are know to crystallize if the concentration is to high and will plug up the water jackets and radiator so a good radiator flush will fix the poor circulation problem, also try to keep the coolant to a 50/50 mix, to much antifreeze will gel up when heated and to much water will boil over.  As for the temperature sensor, it's not that expensive and can be replaced with simple tools, also check the wire harness to ensure that there are no damages or corrosion that would cause a false reading.

Posted on Jul 27, 2009


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