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  #13  
Old 08-25-2011, 02:26 PM
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Re: 4.0 still running hot...

That fan was barely spinning, like I could have stopped it with my hand but didn't of course lol so I'm gonna replace it asap! Thank you all!
I'm confident it isn't the radiator because it only heats up over 210 once in a great while
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Old 08-26-2011, 01:48 PM
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Re: 4.0 still running hot...

Mike, if you haven't replaced the cap with a new one yet, I'd highly recommend you do that too brother...it's super cheap insurance. I can't tell you how many people have spent hours chasing problems when all it needed was a new friggin cap. If you decide later to put in a lower temp stat, that can only help. I did it in my 4.0L TJ. Just took a little longer for the heater to get hot in the winter. Time for some hood louvers!!!!!!!!!!!!!!!!! They add 20hp at least you know...
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Old 08-26-2011, 01:56 PM
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Re: 4.0 still running hot...

Thanks Tony ill get a new rad cap as well!
As for the hood louvers.. No thanks ill pass on that lol
Hopefully the new fan clutch and rad cap will keep da bitch cooler lol
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Old 08-26-2011, 03:01 PM
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Re: 4.0 still running hot...

If the radiator cap gets bad, you can feel it on the upper hose going from the radiator to the engine. If you can easily squeeze the hose when the engine is hot (use gloves to prevent burns), your radiator cap needs to be replaced. Normally the cap should keep an 18 PSI pressure in the cooling system, raising the boiling point of the cooling liquid.
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  #17  
Old 08-26-2011, 08:45 PM
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Re: 4.0 still running hot...

That makes sense...I never considered "testing" it that way. Good tip!

Mike, go squeeze your hose and see if it feels firm...hahahahhaha.
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  #18  
Old 08-26-2011, 08:59 PM
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Re: 4.0 still running hot...

I had this issue with my 98 GC as well as BOTH of my 2003's. The problem was the module that operates the electric cooling fan would overheat, and the connector would get damaged. We would replace the connector, and the module, and all problems went away!
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