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Unread 05-20-2012, 12:53 PM   #1
Brandon210210
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1997 TJ Wrangler 
 
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Overheating help!!

Have a 4.0L 97 jeep wrangler on a 4in lift on 35" tires. Recently it's been hot outside so I started using the air conditioner. I've been noticing while driving with the air on my temp gauge will go a little over the half mark? What could be the issue?

Also when I was here in the beach in corpus I was going through some Sand dunes for a while and started to over heat bad. But has not over heated like that since.

Let me add I have replaced the thermostat with a fail proof before the issues and had no problem with loosing coolant.

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Unread 05-20-2012, 01:44 PM   #2
chero123
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It appears that your radiator can't get rid if all the heat you are producing. Either your fan/fans are not woring as they should, ir the radiator has clogged passages. If the radiator fans are working good, u need a new radiator.
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Unread 05-20-2012, 04:54 PM   #3
jnicewan
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Check between the radiator and condensor too for debris like leaves or mud etc. When its running hot can you hear the fan pulling air? You should hear the fan mainly above 1500 RPM, but with the hood open at idle you should feel a lot of air moving from the fan. If not then it could be the fan clutch.
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Unread 05-20-2012, 04:59 PM   #4
Brandon210210
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That fan is perfect I hear it turn on and feel the air
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Unread 05-20-2012, 05:53 PM   #5
BleepinJeep
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Quote:
Originally Posted by Brandon210210 View Post
Have a 4.0L 97 jeep wrangler on a 4in lift on 35" tires. Recently it's been hot outside so I started using the air conditioner. I've been noticing while driving with the air on my temp gauge will go a little over the half mark? What could be the issue?

Also when I was here in the beach in corpus I was going through some Sand dunes for a while and started to over heat bad. But has not over heated like that since.

Let me add I have replaced the thermostat with a fail proof before the issues and had no problem with loosing coolant.

If it is very hot out and you have the A/C on I would expect the temp to go "just a little past the halfway mark".

When you replaced the thermostat, did you make sure it was burped real good?

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Unread 05-20-2012, 06:33 PM   #6
Brandon210210
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Quote:
Originally Posted by BleepinJeep

If it is very hot out and you have the A/C on I would expect the temp to go "just a little past the halfway mark".

When you replaced the thermostat, did you make sure it was burped real good?

Video Link: http://www.youtube.com/watch?v=MrBI1hRTgx4
I had mechanic do it. Why do you think the temp shot up to red in the sand?
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Unread 05-20-2012, 08:05 PM   #7
chero123
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The temp went higher in the sand because the engine works hard but you are moving very slow and don't have enough air flow. Kind of like driving on the highway with a panel in front of the radiator. In order for the heat to go away, you need to have a good radiator with air flowing, cooling it down. On a new car, the fans are doing a good enough job, but as the system ages, it looses efficiency.
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Unread 05-20-2012, 09:06 PM   #8
Brandon210210
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Quote:
Originally Posted by chero123
The temp went higher in the sand because the engine works hard but you are moving very slow and don't have enough air flow. Kind of like driving on the highway with a panel in front of the radiator. In order for the heat to go away, you need to have a good radiator with air flowing, cooling it down. On a new car, the fans are doing a good enough job, but as the system ages, it looses efficiency.
So what should I do?

Sorry for all the questions I'm still learning.
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Unread 05-20-2012, 09:32 PM   #9
BleepinJeep
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if its only a little past the middle I wouldn't fiddle Especially with the A/C on. if it starts creeping up towards the red and doesnt come back down then shut it off cause you have a problem. And maybe stay out of the sand.
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Unread 05-20-2012, 09:45 PM   #10
Brandon210210
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Quote:
Originally Posted by BleepinJeep
if its only a little past the middle I wouldn't fiddle Especially with the A/C on. if it starts creeping up towards the red and doesnt come back down then shut it off cause you have a problem. And maybe stay out of the sand.
Dam but I love the sand lol any other solution I see other jeeps out there with no problem.
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Unread 05-21-2012, 06:42 AM   #11
chero123
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Then you need to fix it, or maybe even considering upgrading. Or you could take lots of breaks when you go to the sand dunes. Just don't run it if it gets to red, you will ruin the engine.
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Unread 05-21-2012, 09:12 AM   #12
Brandon210210
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Up grade the radiator?
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