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Old 07-24-2012, 07:17 PM   #1
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Overheating

I recently purchased a 2002 Jeep Wrangler Sport but it's overheating. I've replaced the thermostat as well as flushed the cooling system but it's still overheating; especially when it gets warm outside. Any help/insight would be greatly appreciated. Thanks

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Old 07-24-2012, 07:29 PM   #2
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Quote:
Originally Posted by triley6511
I recently purchased a 2002 Jeep Wrangler Sport but it's overheating. I've replaced the thermostat as well as flushed the cooling system but it's still overheating; especially when it gets warm outside. Any help/insight would be greatly appreciated. Thanks
Sounds like a bad water pump

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Old 07-24-2012, 08:47 PM   #3
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When is it overheating (highway, idle)? Check the radiator front and back for any debris. Check the upper and lower hoses for collapsing...you'll have to remove them and look inside to be 100% sure. Did you do a chemical flush or just ran the hose through it? Spin the fan by hand...it should only spin around half a turn after you let go. Do you see any leaking from the water pump weep hole...another sign of a bad pump is the shaft connecting the fan will wobble or you'll hear a not so normal sound. They usually just leak like a bastard though.
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Old 07-24-2012, 08:53 PM   #4
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what temp is it going up to.. 210-215 is normal...
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Old 07-24-2012, 09:51 PM   #5
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Thanks for the tips; I'll check them out. It typically runs about 220 or so but when it's warm out (80+) it's not uncommon for it to spike (max out the gauge). I also replaced the sending unit to make sure it wasn't faulty. You can hear the water boiling in the overflow container.
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Old 07-24-2012, 10:41 PM   #6
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Pressure test the system also (you can rent the gauge from chinazone) and put a new radiator cap on...I think stock psi is 18. Boiling is bad that means it's getting into the 260*+ range. One pound of pressure raises the boiling point (212*) by 3*...so that's like 266* unless you're losing pressure which I think you are.
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Old 07-25-2012, 06:03 AM   #7
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Could also be air in the system. But a common issues was the plastic and metal tank leaking at the crimp together locations. Usually takes place over 100k miles.
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Old 07-25-2012, 06:29 AM   #8
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My 02 rad had a small crack on the top tank in the seam. It was under the serpentine belt sticker and I like to have never found it. I replaced the rad with no issues. Even losing coolant I never overheated. You may want to do the water pump and the rad at the same time, if it's not circulating to cool in the radiator then that could bring about your overheat issue.
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Old 07-26-2012, 05:08 PM   #9
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Must be the overheating time of year.

97 Wrangler with the 4.0 and 130k. Wife's buggy that I just put $1300 into for starting issues (sending unit in the gas tank. OUCH), intermittent spark issue and other things I probably didn't need.

I replaced the water pump last year after a leakage, but skipped the radiator. It made it into the red today and then backed off while the wife was driving it down the freeway more than once. That seems to me like a thermostat but I don't think those things are in there like the old days.

Sounds like the stock radiators don't do a great job of cooling. I have the issue from other threads on the low oil pressure also.

What should I try besides waiting for the weather to cool off?
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Old 07-26-2012, 05:24 PM   #10
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I'm not a big fan of the plastic tank radiators but they do work on the jeep, don't hate on them. Mine lasted almost 11 years so I put the factory replacement back in. You can buy an all metal one but not sure if it's cost effective based on cash layout. If you do proper maintenance and replace the coolant regularly it should last.
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Old 07-26-2012, 11:32 PM   #11
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Originally Posted by Pfunky View Post
Must be the overheating time of year.

97 Wrangler with the 4.0 and 130k. Wife's buggy that I just put $1300 into for starting issues (sending unit in the gas tank. OUCH), intermittent spark issue and other things I probably didn't need.

I replaced the water pump last year after a leakage, but skipped the radiator. It made it into the red today and then backed off while the wife was driving it down the freeway more than once. That seems to me like a thermostat but I don't think those things are in there like the old days.

Sounds like the stock radiators don't do a great job of cooling. I have the issue from other threads on the low oil pressure also.

What should I try besides waiting for the weather to cool off?
It couldn't hurt to replace the stat if that's what you think it is. You might as well flush the system while it's out and then throw a OE stat in there.
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Old 08-13-2012, 03:44 PM   #12
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1998 w/106k miles on it, I picked up the Jeep and drove it for the first time home from Auburn, CA to Reno, NV, I thought it was running a bit hot (215-225ish), but I haven't owned this type of Jeep ever (lifted with 35" tires). Didn't over heat until 2 days later tried crawling a few hills in BLM land nothing big at all and it overheated on me twice. The overflow was boiling over. Got it home and swapped out the thermostat and put in a 180 degree one. Drove fine for a few days, even took it on an easy 1 hour trail twice with no problems. Then next day drove it to the store and the temp hit the red again.
All the tests I did from suggestions, passed with flying colors, except... having the Jeep running and when the thermostat is supposed to open the bottom radiator hose never heated up at all...
Frusterated, I call a few people and search this forum and start looking at all the peices I can swap out. Fan clutch (put a nice heavy duty one in) and new rad cap 18lb, still over heated. Then this last weekend I was bound to fix it. Before I even start, new thermostat 195 (recommended by everyone on these forums), new temp sending unit, and water pump, along with flushing the heatercore and radiator. Unbolting everything down to the pump I see the old pump is completely rusted out on the inside, no pinwheel with edges to help the thing circulate, just a rusty blender star in its place. I'm overwhelmed with joy, this is it!!! bolted everything back on and drove around in 100 plus temps today with the A/C on max and before it even hits the 210 mark it starts going back down. THANK YOU all for the tips, it really helps having a great fourm to reference.
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Old 05-27-2013, 11:28 AM   #13
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Hi guys. I have a problem. My brother has an 02 wrangler sport 4.0 L that's running hot. He says it only does it while driving. Usually the temp sits slightly above 210 but it will quickly spike until he presses the clutch. Also his water appears to be rusted. He put a new thermostat on it (I'm not sure what temp though) and a new radiator cap. I'm no mechanic but I'm thinking it might be the water pump due to all the rust, even though it's not leaking. But again, I'm not a mechanic so i don't know. Any help any of you guys could give would be greatly appreciated.
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Old 07-22-2013, 12:10 PM   #14
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If water is boiling to overflow. You dnt have enough mix of coolant. Water cools better then antifreeze. But water boils turns to steam. Steam does not cool. Also its cheap to replace radiator cap. If its not holding at 18 psi it will allow overflow. I recently had a overheating battle. Resolved all mecanical issues w cooling system. Including all new gaskets just because 177,xxx miles. Ended up going w Drake aluminum 2 row RADIATOR. a 195 hi flow thermostat frm action auto parts. A $26 dorman 9 blade fan. Now jeep holds all day. At 200° idle or driving regardless of how hot it is outside

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