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Old 08-08-2012, 05:14 PM   #31
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Originally Posted by SilverSport View Post
Ok, I have to ask. With the engine cold is the radiator full of coolant and with the engine hot is the coolant in the overflow reservoir at the "maximum" mark?
When it's cold the radiator is full. When the engine is hot the coolant might not be at max. Depending upon where it is cold; my 10 was approx. 1-1.5 inches above the min. line from the factory cold and has stayed that way since. Mine goes about half way up to max. It only expands so much. Anywhere between min. and max. hot is fine for range. If you've topped it off too much it's only going to push thru the overflow.

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Old 08-09-2012, 02:25 AM   #32
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WTF do you mean "as well"? The words electric and waterproof do not go well together.

I am in the engineering industry and a waterproof electric motor is not difficult to get.
I know of other manufactures that have no issue with theire electrical fans.

And I thought the Rubicon is trail rated!!

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Old 08-10-2012, 03:12 PM   #33
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Jeep Tested the Rubi today. Tempreture at Normal operating is at 104 degree C and goes up to 115 degree C with a little up hill (3/4 position).

They also saw that it is leaking a bit on the coolent bleed screw. They still want to check if the thermostat is not sticky and at what tempreture the fan kicks in.

Will keep you posted.
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Old 08-10-2012, 05:41 PM   #34
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Our 2012 Rubicon JKU has never overheated. It warms up fast but doesn't go over where it shouldbe. We weigh in at 5,120 lbs with all the armor on it and the tall Warn Powerplabnt winch on a Rockhard front bumper doesn't impeed airflow through the radiator. We can wheel all day in 108 degree heat in Moab while running the air without worrying about overheaqting. The closest I've come to overheating was with my 4.0 TJ. It would percolate after a long climb at high altitude once I shut it off. The 2012 Rubi has no issues. If your's is overheating then it's time for the dealer to fix it. Could well be something as simple as a thermostat.
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Old 08-11-2012, 09:58 AM   #35
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I had this problem when wheeling in Colorado. In a at 100 Plus degrees and a hill climb temp gauge would read to 3/4. then drop to 5/8th onthe temp gauge.

I determioned it was a temp control issue hot a radiator capacity issue. The Jeep Dealer in Montrose CO changed the thermostat housing assembly and the problem went away. I tested it on the exact same road with 100 degrees plus temps and never went above 1/2 on the gauge at that time nor on wheeling thereafter. Always 1/2.

A friend has a '12 Rubicon and even with a front winch which block the radiator a little never has a problem in Southern Arizona in the summer.

Hope this helps.
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Old 08-11-2012, 12:54 PM   #36
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Originally Posted by azpics View Post
I had this problem when wheeling in Colorado. In a at 100 Plus degrees and a hill climb temp gauge would read to 3/4. then drop to 5/8th onthe temp gauge.

I determioned it was a temp control issue hot a radiator capacity issue. The Jeep Dealer in Montrose CO changed the thermostat housing assembly and the problem went away. I tested it on the exact same road with 100 degrees plus temps and never went above 1/2 on the gauge at that time nor on wheeling thereafter. Always 1/2.

A friend has a '12 Rubicon and even with a front winch which block the radiator a little never has a problem in Southern Arizona in the summer.

Hope this helps.
Thanks for the information. Can you please tell me what they changed on the thermostat housing?

I will inform the Jeep Dealer on Monday and actaully going to insist that they change the housing as what you will recommend.
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Old 08-13-2012, 02:05 PM   #37
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Originally Posted by azpics View Post
I had this problem when wheeling in Colorado. In a at 100 Plus degrees and a hill climb temp gauge would read to 3/4. then drop to 5/8th onthe temp gauge.

I determioned it was a temp control issue hot a radiator capacity issue. The Jeep Dealer in Montrose CO changed the thermostat housing assembly and the problem went away. I tested it on the exact same road with 100 degrees plus temps and never went above 1/2 on the gauge at that time nor on wheeling thereafter. Always 1/2.

A friend has a '12 Rubicon and even with a front winch which block the radiator a little never has a problem in Southern Arizona in the summer.

Hope this helps.
Showed your post today to JEEP and they agreed that they will changed my thermostat housing assembly.
It will take 15-20 days as they have to order it from the USA.

Will give feedback when the part is changed.

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