Question about 2004 Jeep Wrangler

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2004 Jeep wrangler 4.0 - 6cyl overheating

My 2004 jeep wrangler was overheating, so I replace the thermostat...thought there might have been a leak in my radiator but it turned out to be just a faulty radiator cap...however with the new thermostat the engine still overheats...when I remove the thermostat completely the engine runs perfectly fine at normal temperature...could have been just a faulty thermostat...should I try installing a new thermostat once again? Any insight would be helpful

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  • thereitis Sep 02, 2008

    Is there way to trouble shoot the water pump without replacing it?

  • eleets1 Feb 09, 2009

    I have a 04 wrangler as well Ive gone through several thermostats and changed the water pump twice im baffeled

  • cranz1 Mar 11, 2009

    i have a 2002 wrangler with the same problem, i replaced the thermostat twice, put a new 3 core radiator in and replaced the clutch and fan with an electric fan, the only thing left is the water pump, which i dont think is bad. i did hear that you have to burp the system after replaceing such items, but have no idea what this means to burp the system.........

  • Anonymous Mar 19, 2014

    new radiator new thermostat

  • Anonymous Mar 25, 2014

    faulty code p0218

  • Anonymous Mar 27, 2014

    replaced thermostat overheated again

  • Matthew J Corbett May 13, 2017

    my jeep does the same. my radiator fan does not spin but spins freely coil and up to temp. it's the radiator fan relay. see if your fan spins when car up to temp or close to overheat. good hunting my friend



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I had the same overheating problem in my jeep ! My problem was finaly found out to be the clutch in my fan its a different kind of clutch system it work as this. When your jeep gets warmer the tighter your fan clutch gets .While cool your fan moves slowly. now to test your clutch just warm up your jeep and rev it up a bit if your fan dose not pick up speed then it is sliping.What will come out of this is that you fan will the seez and run full all the time. if you jeep dose not overheat wile moving then it is not your thermo stat period.

Posted on Oct 14, 2008

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Try replacing the radiator fan relay

Posted on Jul 17, 2013

  • paulhellyar
    paulhellyar Jul 17, 2013

    try replacing the radiator fan relay


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Yes, for the price of a thermostat and the real possibility of getting a faulty one (that won't open or won't open fully) out of the box, I'd try another one...

If it still overheats, the water pump might be a probable culprit. It might not be sending enough water flow to cool the engine. Even with the thermostat fully open, it still restricts the water flow compared to no thermostat at all... When you take it out, it might flow enough that the engine does not overheat anymore.

Posted on Sep 02, 2008

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Hello, jilluptain and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your
2006 Jeep Wrangler, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating
2006 Jeep Wrangler

Get more great money saving tips and tricks about your vehicle from:

Thanks for the vote, and good luck!

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