The Mud Pit > Wrenching

01 XJ 4.0L auto check engine light

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CnoteTJ:
My buddy started up his XJ this morning and immediately got the check engine light.  After allowing it to warm up for 5 minutes he came back and it was already starting to overheat!  Anyone have any experience with this, also, anyone have a code reader so we dont have to limp-it to advance auto!  Preesh the help homies.

mallcrawl:
my bet would be the electric fans not spinning, not sure why it would have triggered the check engine light instantly though.

Axle:
Could be a bad thermostat.

CnoteTJ:
i was thinking thermostat, i just want to get more opinions if thats not it and the check engine light is throwing me off

reg:
not to be too obvious, but to my knowledge XJ's have mechnical fans (at least mine did 2000)  I had similiar problems.  how hot did it get.  fluid level good?  try pulling the thermo and running it.  does it still overheat?  I upgraded to this: CSF heavy duty 3-row for $165.


I loved it, never had problems again.  Mine would overheat anytime there wasn't air moving over the radiator. I tried everything, but finally it came down to the radiator.  EASY INSTALL.

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