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Have a 98 Saturn DOHC 5 speed. Radiator fan will not come when hot but comes on when AC is used. I replaced the temperature sensor and connector but still no help. The “check engine” warning does not come on. I replaced the temperature sensor and connector. I also verified that there was 5.0 Volts measured at the sensor connector. I allowed the engine to idle until the temperature gauge was somewhat past mid range and coolant (now water) started bubbling out the tank. I turned the AC on and in less that 2 minutes, it had cooled down to near normal. What next?

Response:

Try using a paperclip to short the two terminals of the coolant temp sensor together. If the fan then comes on the problem is with the sensor or the coolant is not contacting the tip of the sensor.

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