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Old 08-19-2009, 06:34 PM   #1
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hot day+a/c=starting to overheat

I have a 2005 Jeep wrangler sport 4.0 my wife likes to have the a/c on when she is in the car. Normally there is not a problem with the temp going up but yesterday was about 95 degrees out, she wanted the a/c on and after a while in stop and go traffic the temp needle started to creep over the normal temp into what woud have been the danger zone if I didn't turn off the a/c. Then the temp wentback to normal. Any ideas what would cause this? This id the first time I have had an issue like this yet and I want to nip it in the bud if possible.

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Old 08-19-2009, 07:00 PM   #2
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i had the same problem in my 95 mustang, i ended up flushing the radiator and that worked it seemed but then 2 weeks later my tank sprung a leak so i ended up buying a totally new radiator and the problem never occured again...

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Old 08-20-2009, 09:40 AM   #3
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The first thing I would check is the coolant levels
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Old 08-20-2009, 05:33 PM   #4
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I would want to check the compressor cluch. Maybe it is locking up.
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Old 08-20-2009, 07:37 PM   #5
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I honestly don't know so I'll ask, wouldn't the compressor clutch locking up keep the A/C from blowing cold? The OP sounds like his AC was still cold.
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Old 08-21-2009, 08:28 AM   #6
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The a/c stayed cold. I don't think that is the issue.
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Old 08-21-2009, 05:13 PM   #7
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...coolant levels are also correct
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Old 08-21-2009, 05:22 PM   #8
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Smile air cond heat up

over time the tubes in the radiator will start to close up and get smaller due to corrosion and it will lose some of its cooling capacity- my guess is new radiator will fix problem also a new thermastat.
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Old 08-22-2009, 10:52 AM   #9
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Thanks first tmer, I'm gonna try a flush again since its been just about a year since the last time it was done(I only flushed it with water last time now that I recall not a flushinf solution) and hope for the best. the termastat was just changed so I'm not goint to replace that ...yet. this will be done tomorrow...I will report back my results
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Old 08-24-2009, 08:32 AM   #10
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You may want to check the fan clutch, It may be going bad and not locking up when the engine heats up.
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Old 08-24-2009, 09:04 AM   #11
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Quote:
Originally Posted by olivajcarmine View Post
the termastat was just changed so I'm not goint to replace that ...yet. this will be done tomorrow...I will report back my results
So the Thermostat was changed before the (first and only) overheating episode? if so me thinks you has bad thermostat...
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Old 08-24-2009, 10:14 AM   #12
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Agree with mrcarcrazy....all was fine then you changed the Thermo...now you are overheating!!!.put the old one back and see what happens!

Also if the cooling system is all rusty and funky again after just a year on fresh fluids pull the radiator get it to a pro for a real clean out and really flush the block. Good luck.

Bill J.
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Old 08-24-2009, 07:40 PM   #13
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I appreciate all the advice, here is what has been done lately, I ran a decent flush through the radiator(flushed out the system with water than ran an over the counter flush for the 3 hours specified in the directions) so far I seem to be OK, I'm just waiting for the next 95 degree day so can give it a real test. The Fan clutch is functioning according to my manuals tests. I appreciate everyone helping out. If this dosen't work I think I'll be checking out another thermostat

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