ok guys I really need your help. Heres the background: I have a 93 cherokee with a brand new motor i put in with only the 2000 miles I have put on it since I got it. Its a 4.0 ho with a 5.5in lift on 33's and SYE and about 500 or more pounds of added metal from the front, rear bumper, exo cage, rock sliders spare tire and tools. i also have the stock 3.55 gearing.
I'm having a problem with the engine getting above normal opporating temperatures when im climbing any hill no matter what gear I'm in. I have a new radiator and water pump and fluid and i even vented the hood and put a switch on the electric fan so i can keep in running all the time. there are no coolent leaks or oil leask at all.
My thought is that its my gearing. I was thinking of changing it to 4.10 cause i want to pull my small tent trailer with it as well. I was looking into a high volume water pump but those dont help that much in the higher RPM's. What should I do?

 

If it get hot at lower speeds or idling or climbing hills at slower speed it is commonly caused by a failing fan clutch. Also when you installed you new rad and water pump did you put in a new t-stat? If not you may also want to put in a new one the recommended temp for the 4.0 is a 195 t-stat. Change those 2 things out and it should take care of your problem that is when you changed out all of the other part you gave the entire cooling system a good flushing too. Let us know if this takes care of your problem.

 

I already replaced those things. everything on the motor is brand new. from the fluid to the block to the motor mounts. it doesnt get hot at idle. only when im going up something.

 

R u positive about the fan clutch being new? Is the fan shroud intact/in place?

 

fan clutch is new and shroud in all there.

 

A/C condensor,if you have one,clogged?

 

I replaced my clogged heater core and that seemed to solve my overheating problems. You might consider that.

 

when i turn my heater on i can bring down the engines temp. So thats telling me the heater core is working. I have a lot of added medal on the jeep like my exo cage, slides, and front and rear bumper and my skid plates. comes out to be like an added 500+ lbs. whould my stock gearing and all the added weight be an issue?

 

Okay let's see a list of all the items you HAVE replaced. Heater cooling your Jeep downs mean something is clogged or not moving enough air.

A transmission cooler is strongly recommended for the AW4, as is regearing.

 

x2. Your transmission hates you. 500+lbs of extra weight, 33" tires, and stock gears... I would consider getting the biggest transmission cooler you can fit in front of the mech fan and bypass the radiator cooler.

 

A lot of the guys i wheel with have all that extra weight also and do fine with 3.55 gears. I dont think its your gearing. Try replacing your heater hoses, the bottom rad hose has a tendency to collapse when it gets older.

If you plan on towing, i would definately regear, will be tough on the freeway with all the added weight. Also tranny cooler!

Check your trans fluid, I have heard of people having low trans fluid and it getting to hot, heating the radiator fluid up as it passes through to cool.

 

I just replaced my radiator hoses and the new lower one didn't have a spring inside so I put the old one in. Not 100% sure that is right but thats what I did. Maybe your problem in addition to all that weight and tires.