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Over heating in 4wd!

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Old 08-15-2009 | 12:25 PM
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Default Over heating in 4wd!

Ok. I got the Tank on a 4WD road covered in river rock last weekend, and put him in 4H then 4L and within 10/15 min of both, the temp light was on and the coolant reservoir was boiling over! But I had no problems going over passes at 70+ mph for 3 hours on the way home. What gives?

Any thoughts?
Old 08-15-2009 | 12:47 PM
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if you have no problems at 70,then either you have blockage on the inlet to the a/c cond,or the electric fan is not coming on,it is also possible the mechanical fan is not working good,it sounds like an air flow problem.
Old 08-15-2009 | 06:38 PM
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It just started smoking a little too, so I opened the air filter and there is oil in it. the fans seem fine though. would a radiator flush possibly clear out the blockage?
Old 08-15-2009 | 07:08 PM
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Plus it only has one fan. and the Vac. bottle is busted too.

New to me 93 lots to do!
Old 08-15-2009 | 07:15 PM
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Try checking air flow threw the A/C coil and radiator coil and fan clutch going bad. I am thanking like mixed89 it a air flow problem. Being it happen at very slow speeds
Old 08-15-2009 | 07:27 PM
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Originally Posted by frankthetank
Plus it only has one fan. and the Vac. bottle is busted too.

New to me 93 lots to do!
when you say you have one fan,you mean you have the mechanical fan right,and you do not have the electric fan? you are suppose to have both fans,if you do not,that is your problem.
Old 08-15-2009 | 07:50 PM
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X2 The electric fan will come on and give more cooling. Your mechanical fan only covers half of the long skinny radiator. It works OK at 70 mph because the air is pushed through uniformly at a higher rate than the fans can do anyway and all the way across the radiator. Make sure that when you are done, you have shrouds for both fans.
Old 08-16-2009 | 08:58 AM
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I figured the speed helped with the airflow but I wasn't sure about the second fan. The driver side half of the radiator does not have a fan.
Old 08-16-2009 | 09:41 AM
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Originally Posted by frankthetank
I figured the speed helped with the airflow but I wasn't sure about the second fan. The driver side half of the radiator does not have a fan.
that is definately your problem. go to the jy and pick up an e/fan. hopefully that's the end of the problem.
Old 08-16-2009 | 09:50 PM
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too bad myself and frank the tank couldnt find one here at our local jy. any suggestions on websites for buying a new one?
Old 08-16-2009 | 09:50 PM
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i am only asking because it was his 5 anniversary with his wife this past weekend and i need to get him a gift!
Old 08-16-2009 | 10:32 PM
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Originally Posted by frankthetank
Ok. I got the Tank on a 4WD road covered in river rock last weekend, and put him in 4H then 4L and within 10/15 min of both, the temp light was on and the coolant reservoir was boiling over! But I had no problems going over passes at 70+ mph for 3 hours on the way home. What gives?

Any thoughts?
did you get muddy, clean out rad?
Old 08-17-2009 | 07:03 AM
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I kept it dry but the fan (or lack of fan) seems to be the problem.
Old 08-17-2009 | 07:07 AM
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Originally Posted by zackwilliams
too bad myself and frank the tank couldnt find one here at our local jy. any suggestions on websites for buying a new one?
I found that some of the aftermarket fans did not have enough pulling power to keep the engine cool. I ended up replacing my bad e/fan after several attempts with different aftermarket fans with a stock e/fan from another XJ in the jy. I would just try and get a replacement stock e/fan. unless someone else knows of a good aftermarket fan??
Old 08-17-2009 | 01:53 PM
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try this http://rover.ebay.com/rover/1/711-53...Dp4506.c0.m245


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