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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
  • 44,210 Answers

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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SOURCE: engine running hot after thermostat installed

you have a bad water pump the water isnt circulationg as it should so you need to replace the water pump and soon before it causes damage

Posted on Jan 22, 2009

oldfishead
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SOURCE: Why is it overheating?

Sorry but its common for this year to have a hyd cooling fan motor to go bad along with the coolant degas tank breaking...you'll need ford pn# XW4Z-8K621-AA motor and a # 388898S washer to replace, along with the degas tank..don't forget p/s fluid to refill the system...BESURE you totally PURGE the cooling or it will O/Heat in 2 blocks ....hope this helps you...GL

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SOURCE: northstar engine new waterpump&thermostat

my engine smokes a little bit while running in my 97 deville

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SOURCE: The thermostat does not work and the fan stays on

YOU FAULTY COOLANT SENSOR OR PCM.

Posted on Mar 28, 2010

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SOURCE: I have a 1994 Buick Regal Gran Sport. It will not

it could be as simple as drilling holes in your catalytic converter or replacing them. Alot of these symptoms show up because of a plugged cat. converter or fried o2 sensors

Posted on Apr 09, 2010

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