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post #1 of 19 Old 09-06-2014, 05:14 AM Thread Starter
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Engine over heated

I own jk 2011 3.8 it has ripp super charger on it
When I climbing off road slowly the engine is over heated
Is it normal.
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post #2 of 19 Old 09-06-2014, 06:30 AM
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Auto or manual? If it's an auto, do you have a tranny cooler? Were you in 4lo?
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post #3 of 19 Old 09-06-2014, 06:45 AM
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Slow driving with an auto in 4Hi will cause over heating.

Apparently so will fast driving on dirt roads with traction control still enabled...


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post #4 of 19 Old 09-06-2014, 07:01 AM
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Ive had my transmission give the hot oil warning but Ive never had the engine get hot. I dont have a supercharger though. Even in 100 to 110F weather the gauge never goes above the half way mark. So I would say no its not normal.
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post #5 of 19 Old 09-06-2014, 07:38 AM Thread Starter
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Quote:
Originally Posted by ALASHA View Post
Slow driving with an auto in 4Hi will cause over heating.

Apparently so will fast driving on dirt roads with traction control still enabled...
It's automatic and I add transmission cooler
In 4h & 4lo
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post #6 of 19 Old 09-06-2014, 10:09 AM
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Quote:
Originally Posted by Robnoxious1 View Post
Ive had my transmission give the hot oil warning but Ive never had the engine get hot. I dont have a supercharger though. Even in 100 to 110F weather the gauge never goes above the half way mark. So I would say no its not normal.
Same with mine. Stay out of 4H if you are crawling along. The trans will get hot, it's also a good idea to leave in drive and lock out overdrive. I have a Rubi crawler most often I run the factory t case in 4H and the Rubi crawler in low. This set up gave me a gear ratio that works great on the forest service rds without using 4L
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post #7 of 19 Old 09-06-2014, 10:35 AM
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Weight. Engine over heating while climbing (assuming you are running the right gears, your thermostat works right, your radiator isn't plugged, your tranny is working properly) is about most likely about weight.

If you can't cut weight, then a bigger radiator can help.

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post #8 of 19 Old 09-06-2014, 08:16 PM
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Would louvers help at all?
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post #9 of 19 Old 09-06-2014, 11:10 PM
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Heat reduction hoods can help. It depends on how big the heat problem is.

The fundamentals are about weight and the work to climb. Get rid of weight.

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post #10 of 19 Old 09-07-2014, 09:21 AM
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Quote:
Originally Posted by ALASHA View Post
Slow driving with an auto in 4Hi will cause over heating.

Apparently so will fast driving on dirt roads with traction control still enabled...
I should have been more clear. I meant trans overheating is normal. Engine over heating is not. As LeftHandRubi mentioned, check to make sure everything is working properly.

Do you have a big winch blocking air flow to the radiator?


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post #11 of 19 Old 09-07-2014, 09:27 AM
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If it was me I would make sure the thermostat was opening. I am not sure if they make a lower temp thermostat for Jks or not but that may help. Then I would do a rad flush and add some Waterwetter to the coolant. Then go up a tad on the radiator cap psi. Install some Daystar hood louvers and see what happens then. If I needed more then I would look into installing a manual fan switch.

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post #12 of 19 Old 09-07-2014, 02:19 PM Thread Starter
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Quote:
Originally Posted by ALASHA View Post
I should have been more clear. I meant trans overheating is normal. Engine over heating is not. As LeftHandRubi mentioned, check to make sure everything is working properly.

Do you have a big winch blocking air flow to the radiator?
The supercharger cooler is in front of the radiators I it probably blocking the air flow
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post #13 of 19 Old 09-07-2014, 02:21 PM Thread Starter
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The super charger cooler is in front of the radiator
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post #14 of 19 Old 09-07-2014, 02:44 PM
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I had that set up a few years ago. Yeah if the radiator is plugged it can be a problem. Wash it and see if it is better.

The root problem for me back then was too much weight.

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post #15 of 19 Old 09-07-2014, 06:45 PM
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Quote:
Originally Posted by Doronk View Post
The supercharger cooler is in front of the radiators I it probably blocking the air flow
Shouldn't block it enough to cause overheating. You need to ensure everything is working properly.


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post #16 of 19 Old 09-12-2014, 04:24 AM Thread Starter
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Quote:
Originally Posted by ALASHA View Post
Shouldn't block it enough to cause overheating. You need to ensure everything is working properly.
I found the problem
The radiator fan have 2 speed and have to different relay
Hi speed and low speed
The hi speed relay burn so the fan doesn't got to second speed
Thank you for your help
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post #17 of 19 Old 09-15-2014, 03:37 PM
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Quote:
Originally Posted by Doronk View Post
I found the problem
The radiator fan have 2 speed and have to different relay
Hi speed and low speed
The hi speed relay burn so the fan doesn't got to second speed
Thank you for your help
We have come across this before - as JK's get older the fan relays have burned out. We typically tell people to check this item when they call or email our tech line.

RIPPTECH
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post #18 of 19 Old 09-23-2014, 02:54 PM
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My JK 2011 overheated a couple weeks ago.
details..
2011 JKUR with a RIPP, larger injectors, a tranny cooler, and a 2010 PCM tuned by RMP extreme.
4 people and the dog in the JK on a 96 degree day climbing up big bear mountain at about 35 mph
38" toyo MT's with 5:13 gears on an auto, hard doors, hard top. sunken mount winch not in front of the radiator.
the high/ low speed fan relay works. I replaced it a year ago and I pulled over to make sure the fan was spinning hard when it started getting hot.
We put the heater on and didn't run the A/C at all but I still had to pull over and let it idle for a few min to cool down.
I know it runs hot often because the stock exhaust manifolds didn't last a year.
I ordered some hood vents and opened up the inner fenders. I've had the supercharger for about 30000 miles now. it gets hot every time I do long climbs with the temps above 90 (3 times now).
I think it's just the weight. not just the loaded down JKU but the tires are crazy heavy and I know from the effort required to stop them that the poor 3.8 hamsters are struggling.
On this same trip I got stuck in 2 hours of barely moving traffic on the freeway where it was above 100 degrees and it never got hot at all with the AC blasting
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post #19 of 19 Old 09-23-2014, 03:00 PM
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Weight and grade. Going slower would have cooled it me thinks.

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