Temp gauge
02-19-2021, 01:16 PM
#1
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Year: 1988
Model: Comanche (MJ)
Engine: 1991 inline 6 4.0
Temp gauge
Any ideas on why temp gauge is jumping from 150-250 rapidly and bounce around? Will sometimes jump from 100 to 250 very quick and will never show actual temp. Jeep is cold and just started . Also electric fan is not kicking on. Already changed temp sensor and did not work. I checked if electric fan works and it does. So it’s clearly not getting power.
Forgot to mention just changed radiator for a faulty one with a hole in it. Temp gauge was broke before I changed radiator though. I burped the system for a good while and no change.
Forgot to mention just changed radiator for a faulty one with a hole in it. Temp gauge was broke before I changed radiator though. I burped the system for a good while and no change.
02-21-2021, 06:44 AM
#2
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Follow the wire from the temp gauge sending unit on the back of the head. It could have a bare spot or be pinched.
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