Question about 1988 Jeep Wrangler

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Temp Guage Issue

I have a 1988 Wrangler and last week the Temp Guage started acting up (After 5 minutes, it pegs past 260). I have replaced the sensor, the sending unit and the guage itself. No luck! Help! any Ideas?

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  • tmfeldt Dec 19, 2008

    No, runs fine....

  • tmfeldt Dec 19, 2008

    Changed that too.....

  • tmfeldt Dec 19, 2008

    The Gauge actually starts out at about 100 then in less than 5 minutes becoms pegged???? The engine doesn't overheat. When I unplug the Sending unit (Left rear of the Head) the needle drops back down...

  • Marvin
    Marvin May 11, 2010

    well I think the engine is overheating, the chances are zero both the guage and the sender are defective, u can use the signal from the ECT (engine coolant temp) sensor to verify the actual engine temp, this is not the same as the guage sender, it is much more precise, but u need a scan tool with live data capabilities, they are about $75 on ebay.

  • Marvin
    Marvin May 11, 2010

    is the engine overheating?



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  • Jeep Master
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If it's not overheating (you did'nt mention any oh) remove the wire from the sensor. if gauge still remains pegged, you have a short to ground in the wiring. First though, On some engines there are two sensors. One is near or on the thermostat housing, another can be found at the left rear corner of the cylinder head. Find out if yours has two before driving yourself nuts following wires!!

Posted on Dec 19, 2008

  • Richard Scordino Dec 19, 2008

    I'm outta here... Only doing this to keep my mind excercised. I stand by my comments and trust the owner to know if their vehicle is overheating or not!!!
    Bye guys!!!


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  • Contributor
  • 32 Answers

Could b thermostat....when car warmed up check hoses from radioator if not hot change thermostat

Posted on Dec 19, 2008


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