allmost over heating

[y-townxj]

Ok so i just, got finished, installing my xj's 4.5 lift and 32's after wheeling it stock for two years ''so i cant wait to cut it loose'' and on my way home from my bro's place it starts to get hot, After driveing for a while. It got hot on the way there aswell, but it was because one of my calipers were frozen....Where should I start, ''could this be teh fan clutch'' and if so how can i tell, so i can just weld it..''Sorry if this information, is hard to understand'', I just need help asap, so i can get out and WHEEL this thing THANKS

[87manche]

did you regear?
I suspect that if you never had problems until the tire change that your trans is now dumping a lot of extra heat into the cooling system.
This is of course assuming you have an auto.
So more information.
What year? There's 2 different cooling systems.
What motor?
Does it overheat on the higway or just slow speed?
does the fan freewheel when it's up to operating temp and you turn the fan by hand?
did you do anything to the cooling system recently that could cause it to have air in it?

[y-townxj]

ok sorry about the confusion, its 1990 4.0 auto, but I have disconected the shifting wire from the trany computer because, it was shifting wierd and this was a ez fix. I just shift, it manually like ''1 3 4 skipping 2 because its controlled by trans computer. Any way the only thing i have dun under the hood recently is change the oil and filter, and it over heats when its climbing hills ''on road'' and when at a stand still.. Keep in mind the xj is not over heating its just gets right to the red and stops.. thanks for helpin

[langer1]

I have seen that happed when the splash shields are missing. When you raise it up the air gets trapped under the front. If the front is up just a little higher than the rear it's worse.

[87manche]

electric fan working?

[y-townxj]

I have seen that happed when the splash shields are missing. When you raise it up the air gets trapped under the front. If the front is up just a little higher than the rear it's worse.

I did just take the splash sheild off, and the rear is slightly lower, then the front are you shure this is possible because it sound to easy to be true..thanks

[y-townxj]

electric fan working?

I dont now, how can i figure out if its working, does it turn on a cetrain temp...thanks

[ODXJ97]

I dont now, how can i figure out if its working, does it turn on a cetrain temp...thanks

Turn on your A/C and it should come on... if it does not come on then either the fan is bad or the aux. fan relay is bad.

[langer1]

I did just take the splash shield off, and the rear is slightly lower, then the front are you shure this is possible because it sound to easy to be true..thanks
I am sure It can cause the problem your having or at the very least Add to it.
That little narrow opening where the air goes in needs all the help you can give it.
With the front down just a little and the shields in place you create a vacuum under the front that helps pull air through the radiator.
With the front up and the shield missing your create high pressure under the front that the fans must overcome.
Get it level or slightly nose down first, make sure you still have the spoiler and the rubber under the radiator.
Old conveyor belt makes great splash shields and at the very least can save you a alternator.

[desertrandy]

I would look into re-gearing. By putting on bigger tires you throw your torque curve off. In effect it is like putting taller gears in. For example, if you have 3.55 gears, by running taller tires it is like running 3.42 gears or something similar. Now your jeep has to work harder to get into the proper rpm range to make power. First, the tranny is going to shift down into lower gears more often and the engine will have to be at higher rpms thereby creating more heat. My guess is if you put lower gears like 3.90 or 4.10 ratios it will probably fix both problems.

[lawsoncl]

ok sorry about the confusion, its 1990 4.0 auto, but I have disconected the shifting wire from the trany computer because, it was shifting wierd and this was a ez fix. I just shift, it manually like ''1 3 4 skipping 2 because its controlled by trans computer. Any way the only thing i have dun under the hood recently is change the oil and filter, and it over heats when its climbing hills ''on road'' and when at a stand still.. Keep in mind the xj is not over heating its just gets right to the red and stops.. thanks for helpin

This also means the torque converter is not locking up so you're generating more heat in the tranny. Also check the tranny cable as gross misadjustment can cause some shifting problems. The TPS sensor is a good candidate for shifting wierdness.

[y-townxj]

ok so me and my dad were, just loking at it trying to get it to run HOT, ''not just almost'' and it wouldnt. When the engine was warm, and running we felt the rad hoses and they were soft and didnt feel like, there was any flow through them at all, could this be that the rad is clogged or somthing..........thanks

[rstarch345]

I am sure It can cause the problem your having or at the very least Add to it.
That little narrow opening where the air goes in needs all the help you can give it.
With the front down just a little and the shields in place you create a vacuum under the front that helps pull air through the radiator.
With the front up and the shield missing your create high pressure under the front that the fans must overcome.
Get it level or slightly nose down first, make sure you still have the spoiler and the rubber under the radiator.
Old conveyor belt makes great splash shields and at the very least can save you a alternator.

Thanks for confirming what I have suspected. I've made a similar argument on another board and was told I was FOS. I've had my guard on and off with experiementation and noticed a considerable difference in generated heat. I'm saving this link and I'll be quoting this next time.

[langer1]

ok so me and my dad were, just loking at it trying to get it to run HOT, ''not just almost'' and it wouldnt. When the engine was warm, and running we felt the rad hoses and they were soft and didnt feel like, there was any flow through them at all, could this be that the rad is clogged or somthing..........thanks
Could be its just not over heating, just running hotter than if was before the lift.
Call Car Talk on 570 wkbn Sat morning I'll be listening for you.