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post #1 of 9 Old 08-15-2009, 08:42 AM Thread Starter
Mudzilla6661
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overheating?

My girlfriend just got her wrangler its a 2002 tj 4 banger auto. anyway we were driving yesterday for a little bit when it suddenly started getting really hot. It did this the other day too we had to let it cool down before we drove it home. It has plenty of coolant, and the radiator looks fine. The other day when it got really hot and then we turned it off we could hear something boiling like the radiator fluid or something. any clue what this problem could be? I was thinking it could be the thermostat is just not working correctly so it wouldn't release coolant into the engine when it got hot? how do you tell if it is the thermostat? what else could it be?

thanks

Kyle


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post #2 of 9 Old 08-15-2009, 10:00 AM
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There's no test for a thermostst that I'm aware of. The part itself is cheap, but replacing the coolant isn't. Have you checked for any leaks?

Tom
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post #3 of 9 Old 08-15-2009, 10:00 AM Thread Starter
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i haven't seen any leaks anywhere yet. I will check again though

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post #4 of 9 Old 08-15-2009, 10:20 AM
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what color is the coolant? is there any brown mud in the overflow container? if so, its likely your coolant's pH is f'ed causing some rust inside the block, heater, etc and could be causing a clog in the system. you'll need to flush the fluid system completely with garden hose, then install new coolant. if you need to replace the thermostat anyway, this is the perfect time to flush the whole system.

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post #5 of 9 Old 08-15-2009, 11:43 AM
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Whatever you do, do not let it run hot until you find the cause. It could cause head warping issues, especially on a 4.

Tom
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post #6 of 9 Old 08-15-2009, 04:49 PM
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The intermittent aspect sounds like a thermostat. I'd replace that first.
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post #7 of 9 Old 08-15-2009, 05:02 PM
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If you are boiling, something is blocked up. I would replace the thermostat and check your hoses. You also will want to make sure you put 50/50 back in.


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post #8 of 9 Old 08-15-2009, 07:49 PM
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Quote:
Originally Posted by daggo66 View Post
There's no test for a thermostst that I'm aware of. The part itself is cheap, but replacing the coolant isn't. Have you checked for any leaks?
Actually, you can test a t-stat at home with a pan of water on the stove top, and a cooking thermometer.

It's even a good idea to test the new ones, plenty of folks have gotten brand new defective t-stats.

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post #9 of 9 Old 08-15-2009, 08:33 PM
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Quote:
Originally Posted by Mean Max View Post
Actually, you can test a t-stat at home with a pan of water on the stove top, and a cooking thermometer.

It's even a good idea to test the new ones, plenty of folks have gotten brand new defective t-stats.

Max
I have had two new ones fail in on the stove right out of the box.


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