YJ overheats in 4-Low ONLY - JeepForum.com

 
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post #1 of 14 Old 09-01-2011, 12:18 AM Thread Starter
digizure
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YJ overheats in 4-Low ONLY

I can't figure this out. My Jeep keeps overheating when it is in 4-Low. It would not overheat in 2 wheel drive. I replaced the thermostat, water pump and even had the head resurfaced. The radiator is a year old so I'm thinking, it is either the radiator or the block. What do you guys think?

M

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post #2 of 14 Old 09-01-2011, 12:21 AM
Desert_Rampage
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Possible fan clutch getting weak??
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post #3 of 14 Old 09-01-2011, 12:38 AM
moonshinefuel
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Quote:
Originally Posted by Desert_Rampage View Post
Possible fan clutch getting weak??
Beat me to it. That was my first thought.
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post #4 of 14 Old 09-01-2011, 12:48 AM
Desert_Rampage
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A simple Fan Clutch test is to: Take a piece of tape between one of the fan blades and the shroud. (Masking tape works great.) Start the engine. If the fan can break the tape, clutch is good. If not, then it's time for a new one.
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post #5 of 14 Old 09-01-2011, 01:01 AM
mike_breaker_5
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clean your radiator. lol

just another guess but if your in 2wd ima guess your driving on the road. if your in 4lol then your not moving very fast at all. lol

so my first step would be to spray the mud and leaves out of the radiator fins (or ac condenser if it's still there), and try again. if that fails to help, maybe a simple flush would help also.

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post #6 of 14 Old 09-01-2011, 05:12 AM
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I agree with all these guys, fan clutch. I had the same issue as you and I ended up putting a Taurus electric fan in after going through 4 fan clutches. I also found out I had no wire in my lower radiator hose to keep it from collapsing under high rpms, so I made one out of a stainless steel welding rod and now my engine runs cool.

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post #7 of 14 Old 09-01-2011, 08:11 AM Thread Starter
digizure
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Thank you for bringing up the fan. I should have mentioned this in my first post... I do have an electric fan. I believe it's a 16 inch.
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post #8 of 14 Old 09-01-2011, 08:28 AM
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4wd low isn't any different then 4wd hi or 2wd as far as cooling goes. It's about how hot the motor is getting and how much cooling capacity you have. Since you have gone through so much I assume you have been having the issue for a while and have started throwing everything at it. Is the electric fan you are using a Taurus fan? Is it on low speed setting? Does it run hot in the 4wd high? I would flush the cooling system with a flush kit to start with.
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post #9 of 14 Old 09-01-2011, 08:50 AM
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Quote:
Originally Posted by digizure View Post
Thank you for bringing up the fan. I should have mentioned this in my first post... I do have an electric fan. I believe it's a 16 inch.
Is this in addition to or instead of the belt driven fan?

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post #10 of 14 Old 09-01-2011, 09:05 AM Thread Starter
digizure
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I removed my mechanical fan. My electric fan is from Flexlite (I think that's what they're called) and there is only one speed.
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post #11 of 14 Old 09-01-2011, 09:24 AM
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Quote:
Originally Posted by digizure View Post
I removed my mechanical fan. My electric fan is from Flexlite (I think that's what they're called) and there is only one speed.
Probably not a high enough CFM. Add another or put the mechanical fan back on, they work.

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post #12 of 14 Old 09-01-2011, 09:34 AM
Que89YJ
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Pull the flex and put a Taurus on. It moves more air then any aftermarket or a mechanical and you are already setup for the electrical fan anyways. Is the fan running on full when you over heat? I would still start with a good flush but as mentioned you could just not be pushing enough air and the Taurus fan can be found in any scrap yard for under $50.
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post #13 of 14 Old 09-01-2011, 10:24 AM
mike_breaker_5
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i have read a thread or 2 about e-fans from flex-a-lite. most common problem is they spin at 10.4 million rpms but have little to no pitch to the blades moving little air over the motor.

also is it spinning the right direction? you can actually make an e-fan spin the wrong way by wiring it in backwards.

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post #14 of 14 Old 09-01-2011, 03:59 PM
Louie4
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Quote:
Originally Posted by Que89YJ
...and the Taurus fan can be found in any scrap yard for under $50.
$16.00.

Lou

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