Question about 1999 Jeep Wrangler

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Coolant and temp sensor location

Temp sensor location on engine, I have found the one that controls the temp gauge on the dash but can't find the one that sends to computer ( supposed to be on the back somewhere

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  • Greg Booth Apr 15, 2009

    cheers mate I'll go have a look,when I remove the one on the thermostat housing the gauge in Dash dies but reads normal temp when hooked up. when jeep gets hot it starts running rough and goes through heaps of fuel , any Ideas ???

  • Greg Booth Apr 15, 2009

    normal hot, fan is mechanical not electric,does the sensor on the thermostat housing also send info to computer as well as dash gauge , have had a good look for another one at rear of engine but can't find one there anywhere

  • Greg Booth Apr 15, 2009

    na no elecrtic fan just the mechanical viscous fan behind the radiator,and no A/C although there is a space for one.Yes it is a 4.0 straight 6, it got a dunking in the river and got a bit wet and since then it runs ok when cold but like **** when it warms up , using heaps of fuel(running rich) lots of carbon blowing out of exhaust, am picking the computer is not backing of fuel supply when it gets to running temp, so suspect temp sensor

  • Greg Booth Apr 15, 2009

    well through it, got stuck in it then went under it and got towed out of ithad to remove spark plugs to blow out some water that entered through crack in exhaust header when it conked out



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4.0 sometimes has one on left rear of cyl head Usually the front one does both ...goes to computer, then to fan relay then fan.

Posted on Apr 15, 2009

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  • Richard Scordino Apr 15, 2009

    Hot as in overheating hot or just normal hot? Is the fan coming on?
    Normal is a bit over 200. You could check the manifold air temp sensor...should be about 4000ohms warm and decreasing as air temp rises. coolant temp, map and mat all work together to regulate fuel mixture. There are tests for all of them.

  • Richard Scordino Apr 15, 2009

    Yup...goes to computer, then fan relay, then fan. (also to temp gauge)A '99 should have an electric fan aside from one on engine??? Electric fan should also come on with A/C. It is a 4.0???

  • Richard Scordino Apr 15, 2009

    Didn't think they even came without A/C anymore! You need to do some testing on those sensors...Unless you have lots of $ just plugging in a bunch of new stuff won't help unless you get lucky. Did you drive through a river or under it? (if you watch the TV commercials you'd believe they can fly and swim...electronics don't like water at all.)



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