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1992 Ford Tempo Coolant Fan

I have a check engine light on, when engine is running! The codes are 117&118 which is coolant temperture high&low circuit input! I've installed a new thermostat , housing and sensor but the light is still on. With the sensor plugged in the fan will not start until the engine is almost to the HOT with the sensor unplugged the fan comes on when the engine is started! This tells me that the circuit is a normally open circuit when the sensor closes the fan comes on, is this correct? Why is the fan running with the sensor unplugged? unplugged?

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  • Stephen Ryan
    Stephen Ryan Jan 04, 2013

    The PCM along with the sensor was bad Thank you for the help



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  • Ford Master
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The "sensor " near the thermostat should have 2 ,3 or 4 wires to it
if it only has one wire , that is the temp gauge sender unit and not the coolant sensor the coolant temp sensor reports to the ecm and that unit then switches on the fan relay that spins the fan
if you unplug the coolant sensor and the fan starts to run you have a serious coolant temp sensor circuit problem
take it to an accredited service center and have it sorted

Posted on May 01, 2017


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