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Old 10-23-2010, 01:38 AM
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engine running cool?

It sees like most wranglers run hot if anything, however mine wants to stay cool apparently. My problem is that my gauge says that it is only running at around 140 degrees, so I changed the thermostat and radiator cap while doing a coolant flush which cured it for about a week and now it is back to running cool, Could it possibly be the temp gauge giving me a wrong reading? Any suggestions are welcome and encouraged.

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Old 10-23-2010, 02:21 AM   #2
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hmm good question. mine runs at 210 exactly. i will do some looking for ya and see if i can help

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Old 10-23-2010, 02:31 AM   #3
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I believe theres a mode you can test your instruments see if the needles are working fine.
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Old 10-23-2010, 02:56 AM   #4
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Quote:
Originally Posted by jasonwrangler View Post
I believe theres a mode you can test your instruments see if the needles are working fine.
yes you put your key in and hold down the trip reset button and cycle the key from off to run '3 times" and then release the trip button and watch the show.
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Old 10-23-2010, 03:42 AM   #5
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What kind of shape is your fan clutch in? Has it seized up?
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Old 10-23-2010, 04:06 AM
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I will try that mode idea later. ohh and the fan clutch is new and working perfectly, good thinking though. Thanks for the help so far guys.
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Old 10-23-2010, 08:01 AM   #7
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The fan clutch would not be the problem. Even if it were to sieze up and run at higher speed than necessary, the thermostat regulates the coolant. It will sound like a prop plane. The thermostat remains shut until its setpoint. No coolant would be going into the radiator. I've had fan clutches sieze up and you will know as it will result in a lot of fan noise.

I'd suspect that dash gauge reading. If it actually was that cold, there is an OBDII code for excessive warm up time. Do you have a check engine light?
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Old 10-23-2010, 08:34 AM   #8
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Quote:
Originally Posted by caleb-97 View Post
It sees like most wranglers run hot if anything, however mine wants to stay cool apparently. My problem is that my gauge says that it is only running at around 140 degrees, so I changed the thermostat and radiator cap while doing a coolant flush which cured it for about a week and now it is back to running cool, Could it possibly be the temp gauge giving me a wrong reading? Any suggestions are welcome and encouraged.
Thermostat........

Did you buy an oem style thermostat with the bleeder hole in it? (If so, did you clock the hole to the 12 o'clock position?) I recently changed my Jeep's thermostat with one with no bleeder hole. I had the same problem. The temp wouldn't get much above 150*. It was a 195* thermostat so it didn't jive. I changed out that after market thermostat for one with the bleeder hole. Worked first time out...

Thermostat for 2.5L & 4.0L
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Old 10-23-2010, 03:20 PM
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All good thoughts, but yes its the right thermostat and it has a vent hole and I put it at twelve o clock, and no the check engine light hasn't come on. I will go do the key turning method described above in about an hour because I thing there is no other explanation other than a faulty reading. Thanks for the help all!
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Old 10-23-2010, 04:02 PM
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Ok I did the trip/turn key method described above and at the end it gave me a 55 and the check engine light flashed for a phew seconds. What does this mean?

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