i have a 1999 grand cherokee i have replaced the rad . fan the temp sensor amd fan relay , the fan runs all the time and temp gage is at bottom has code po118 please help

Asked by wart69 Dec 26, 2016 at 01:07 PM about the 1999 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

i have a 1999 grand cherokee i have replaced the rad . fan the temp sensor amd fan relay , the fan runs all the time and temp gage is at bottom has code po118 please help

3 Answers
103,435

KenF answered 7 years ago

You might need to flush the old coolant and replace with new coolant. http://repairpal.com/obd-ii-code-p0118

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wart69 answered 7 years ago

at the temp sensor it has 9 volts when I unplug the fan it goes down to 5 volts an the temp gage comes back I have changed the coolant all ready ????

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103,435

KenF answered 7 years ago

Check all your wiring and connectors, look for shorts, bad grounds or high impedance or other faults.

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