cooling problem - JeepForum.com

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post #1 of 19 Old 07-23-2012, 04:21 PM Thread Starter
yeti92
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cooling problem

ik the search does wonders but i cant seem to find an answer to this. i have a 96 xj and for some reason it runs about 210 give or take when driving say down a high way at 55, which seems to be ok to me. when in town going stop sign to stop sign, light to light, or not getting stuck at a light but just driving slow through town it like to go above the 210 and run between that and the line before the red zone on the guage. this also happens driving up large hills ( live in the poconos in Pa so up over the mountian to the next town). after getting back to high way speed it slowly goes back down or if i turn on the defroster i hear the fan kick on loudly and it slowly slowly goes back. i do hear the fan sometimes if im listening for it so it does come on by its self, the water pump and thermo stat are also newer. the wate pump went so it was replaced and i replaced the thermo stat to try and fix this issue and it has been happening for a long while now so any and all suggestions or other questions would help thanks

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post #2 of 19 Old 07-23-2012, 06:35 PM
tjwalker
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The #1 cause of temperature creep at idle is a bad fan clutch. Often ignored, inexpensive and easy to replace.

If the temp is GOOD down the highway, I'd pop in a new fan clutch.

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Without "data", all you have is an opinion!
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post #3 of 19 Old 07-23-2012, 07:55 PM
Carves
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X 2 on the fanclutch being the likely problem.
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post #4 of 19 Old 07-23-2012, 08:46 PM
david92xj
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x3 fan clutch
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post #5 of 19 Old 07-23-2012, 08:49 PM Thread Starter
yeti92
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I have replaced the clutch fan once before from the junk yard man you could spin real easy the one I got pretty much stops after u stop pushing on it
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post #6 of 19 Old 07-24-2012, 09:42 AM
buildin1XJ
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Heat creep at Idle almost allways is a bad fan Clutch
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post #7 of 19 Old 07-24-2012, 06:11 PM Thread Starter
yeti92
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Is there a way to determine its bad other than being easy to spin
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post #8 of 19 Old 07-24-2012, 07:29 PM
donthelegend
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Originally Posted by yeti92 View Post
Is there a way to determine its bad other than being easy to spin
No, and even that is not a definitive test. (Well technically I guess you could measure CFM across the radiator at different temperatures, but most people don't have access to that kind of equipment) Fan clutches are a wear item and if you are unsure of its condition and its more than a few years old, replace it. Additionally, your symptoms point directly to the fan clutch as the #1 culprit.
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post #9 of 19 Old 07-24-2012, 11:34 PM
Carves
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Originally Posted by yeti92 View Post
Is there a way to determine its bad other than being easy to spin

In the chrysler service manual theres a process using using a thermal probe, a timing light and sheets of plastic in front of the radiator ... but even that doesnt confirm the CFM rate - just the engager/disengage times according to the air temp behind the radiator.

The spin test, is at best ... indicative only.
Just because it feels locked up - doesnt mean its locked up as much as it should be.

as a general rule of thumb ... throw it away and replace at about 80k miles .... keeping in mind that some last longer and others fail sooner.

Its also a good idea to start out with a new one ... on a new to you vehicle ... as gawd knows what junkyard rubbish someone may have fitted before you bought it.
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post #10 of 19 Old 07-25-2012, 06:49 PM Thread Starter
yeti92
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Well I guess il try a new one and get back to yous but say that doesn't work what's next on the list thanks
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post #11 of 19 Old 07-25-2012, 11:21 PM
ltrail
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Flush cooling system lately? Did the water pump I see but how long ago? Was the system filled wirh the correct mix and properly bled?

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post #12 of 19 Old 07-25-2012, 11:30 PM
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Originally Posted by yeti92 View Post
Well I guess il try a new one and get back to yous but say that doesn't work what's next on the list thanks
Fan clutch seems the most likely, but if this doesn't work then next on the list would possible rad leak (are loosing coolant over time?) or bad rad cap.
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post #13 of 19 Old 07-27-2012, 08:00 PM Thread Starter
yeti92
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Well bought the clutch for the fan hopefully putting it in tomorrow
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post #14 of 19 Old 07-30-2012, 03:14 PM Thread Starter
yeti92
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Well fans in and it seems to have no to little effect on my temp seems like it took a little longer to go over but its been a tad cooler and raining and not 90 degrees out so any other thoughts
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post #15 of 19 Old 07-31-2012, 06:35 PM Thread Starter
yeti92
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Anybody
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