Constant overheating

I have replaced 2 rad caps, 3 thermostats, a dye was used and none appears in the oil pan. A small amount was found on the underside of the hood but not a substantial amount. The water pump was replaced and found a wet gasket and trace corrosion. The gasket indicated seepage, but no substantial leakage. The heater core was checked and no leaks found. I park it in a garage and there are no indications of any fluid leaks.
It over heats at low speed and idling but not all the time. The temp. Gauge normal operating range is about 40% of the dial, when it is about to overheat the gauge either spikes or steadily progresses to the red line. The progression to the red line is never the same but occurs at low or reduced speeds. After reaching the red line, the fan remains or until the temperature goes below the red line. The heater in recent operations has taken some time to throw heat, I recently noticed since the temperature in my region has been in single digits at night.
Do you
have the same problem?
Monday, October 19th, 2009 AT 7:20 PM

1 Reply


It sounds like you might have an issue with the coolant temperature sensor.
A coolant temperature sensor essentially tells the computer how hot or cold the engine is, in return the computer triggers the fan when its hot and changes fuel map accordingly.

It is not sending the correct signal to the fan module for it to start on time.
Do check to what is the actual temperature of the engine while in operation. As you could have a faulty gauge.

I have attached the diagrams for your reference.

Please let me know of any questions.

Thank you.
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Monday, August 9th, 2021 AT 7:47 PM

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