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  #1  
Old 07-07-2010, 12:45 PM
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Cool 03 overland overheating

Anyone have a idea why my 4.7 HO gets hot? While driving temp. stays 210 or below, but sit for for minutes temp goes up 220 plus. One day It did reach the redline and bubbled over. Checked all fluids, everything seems fine. It is 90 to 95 outside, but this is not right. Fan does run slowly at idle.
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Old 07-07-2010, 02:10 PM
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Re: 03 overland overheating

Check to make sure all fans are turning on. Let it idle and watch it heat up and make sure everything cycles on. If it does heat up...check the hoses for more heat then normal or expanding. If none of that shows, i'd replace the thermastat just in case. it is a easy and cheap fix, and is good to do anyway....if none of those work i'm out of ideas bro...

Ooooo....also check the sensor thats under the passanger headlight i think...replace that too maybe.
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Old 07-07-2010, 02:17 PM
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Re: 03 overland overheating

Yes I will put new thermostat in, but not until next week. I gotta work 3 days. Not sure what stock temp the thermostat is, but advance auto has a 195* one for 22 bucks.
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Old 07-08-2010, 12:36 PM
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Re: 03 overland overheating

Yeah bro, 195* is stock, and it's cheap and easy to do. The one thing I suggest is you check it every day to make sure nothing gets clogged in the hoses and makes your engine overheat for too long....
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Old 07-08-2010, 01:27 PM
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Re: 03 overland overheating

JET has a 180* T stat that i have in right now. It costs a little more then the standard one but well worth it in my opinion, especially on the HO motor.
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Old 07-08-2010, 03:10 PM
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Re: 03 overland overheating

Would you have a part number? Where can I find one at? 03 Grand Cherokee overland 4.7 HO.
The 180* sounds good, will put in as soon as I find one and let you all know how it goes.
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Old 07-08-2010, 04:55 PM
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Re: 03 overland overheating

If your jeep has the hydraulic fan feature, the problem could be the hydraulic control solenoid. This fan always runs when the engine is running, however quite low rev. It should run fast when the engine becomes hot.
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Old 07-08-2010, 07:14 PM
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Re: 03 overland overheating

Yes it has the hydraulic fan. Any way to test the relay? I'll see if the fan speeds up when temp. gets high, maybe Friday or Saturday. Will post back...
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Old 07-09-2010, 11:35 AM
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Re: 03 overland overheating

It seems that you can only control the fan using a DRB III scan tool. But if its hot outside, it should be enough to warm up the engine and let it idle for some time, to see if the fan speed increases. If not, most probably the solenoid is bad. You could try to clean the connector on the solenoid first.
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Old 07-09-2010, 12:30 PM
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Re: 03 overland overheating

The JET Stat is part # 10177 for their 180* T-Stat
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Old 07-09-2010, 03:35 PM
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Re: 03 overland overheating

Yes I will verify if the fan speeds up or not and let you know. Thanks for the part # and info, will get back to you all soon.
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Old 07-11-2010, 07:09 AM
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Re: 03 overland overheating

The fan only spins real slow, I let temp go up to 220 ish and fan is just barely turning, this leads me to think fan relay/solenoid. Dont know whether to take to dealer or try fixing myself.
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