Question about 1998 Jeep Grand Cherokee

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Temp guage does not work 1998 Jeep Grand Cherokee 5.9 LTD

All the other gauges in the cluster work fine, but the temp guage is not working; it just doesn't register anything. I asked a shop around here and they said that I'd have to have all the guages replaced in order to fix this issue and it would cost me over $500. Is this accurate?

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  • charlesm219 Jan 27, 2009

    Thaks for the help, but sorry, the extent of my auto fixing knowledge stops with changing a flat or the oil;)



    Are there manuals that would tell me how to do this?

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Have you had the temp sending unit tested or replace?

Posted on Jan 27, 2009

  • Mark Egan Jan 27, 2009

    Yes.

    Go to a local library, usually a larger library, one that is known as a repository library, and look into the Factory Service Manual (not Chiltons, or Motors or Haynes). These are the manuals used by the techs at the dealerships, produced by the manufacturer. They have troubleshooting charts, guides, pictures, etc, to help you work on your vehicle.


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I have a 1998 jeep grand cherokee. Recently the temp gauge has started acting up, sometimes it would work normally then it would drop then sometimes when I start the car it wont move, now my ac will only...


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second, the problem with the vents is most likely caused by either the vacuum line that controls the vent door..or more commonly, the blend door itself...there is a kit available for upgrading the blend door that consists of replacing the old plastic door with a metal one...if you do a general search on the internet using the words "98 jeep grand cherokee blend door problem" it will giuve you several site in which they sell the parts and the insructions to install

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Check this image...

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...in the Section ZJ-Secc-8D-Ignition-Systems (page 5, fig. 10 and 11).

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1 Answer

The temp guage


They are right on the gauge cluster, but is it the gauge, or is it the temperature sending unit, which is mounted on the engine block?

Two different components entirely. BTW - I have a '03 Jeep Cherokee, so I've looked at a lot of this before.

You might also go to the www.wjjeeps.com website and see what you can find there.

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1 Answer

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If you changed the coolant temperature sensor and it had a 5 volt ref signal to it then you replaced the wrong part. You need to replace the coolant temperature sending unit.  The coolant temp "sensor" is an input to the ECM for your fuel injection system. The coolant temp "sending unit" is for coolant temp reading at the gauge, It is an NTC switch (negative temperature coefficient) which means as temp increases/resistance decreases. 

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Your thermostat is stuck closed. It needs to be changed right away. By the way the operating temp on that motor is 160 degrees so you are running hot you have just been lucky so far. Good Luck

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