Engine Oil Cooler

First thing is do you have the second transmission oil cooler? It goes in line with the radiator cooler and sits in front of the radiator on the left. If you don't I'd go with OEM, it just plugs in. I'm not a fan of the ones that use plastic connectors through the radiator.

Oil cooling is another matter. Apart from a remote filter adapter and all the plumbing, you might be better off with a three core radiator to replace the two core your Jeep probably came with (double check the build sheet)

I already installed a three core radiator, it didn't seem to help much, but some. Is the transmission cooler easier to install, and does it help much? If so where would I get a inline transmission cooler? Thanks a ton!

Doug, Where can one access the build sheet ! I believe someone on this n/g mentioned a Jeep website that had this information available, quite recently ?

Thanks, BMC

Neither a transmission oil cooler nor an engine oil cooler is going to reduce excessive temperature on towing. They might prevent the transmission and engine from burning up due to thermal breakdown of the oil, but neither one will make the temperature gauge needle go down. Is there an aftermarket heavy duty fan available, and is your current fan clutch in good shape?

Earle

You can either take your VIN into a Jeep dealer and have them print it out

A link is on this forum thread for making an online request.

The transmission cooler is a bolt-in. It basically fits in line with the tranny cooler that is built into the radiator. I think the only source is OEM. you could try the folks at chryslerpartsdirect.com

Thanks Doug, BMC

The 4.0 GC shouldn't overheat at all when towing, even with stock equipment. If you've installed a larger radiator and heat is still a problem, look elsewhere for the problem.

Is the load too heavy? Tires properly inflated? Wrong RPM range? (when towing, drop a gear to add 10-15% more RPM than normal and stay out of OD with an automatic transmission.) Is the cooling system well maintained? Is the water pump internally damaged? Drive belt slipping? If the fan is electric, is it functioning properly? Turning on at the proper temp? Is the A/C on, accidentally or purposely? Excessive vehicle speeds? Thermostat problem?

Well I have replaced the thermostat about a year ago with a OEM 195 degree, and then I have just recently replaced the OEM 2 core radiator with a three core, I also replaced all my supentine belt not to long ago either and it still has problems sometimes, not as much, but I do understand that its usually about 100 degrees outside, and of course I run the A/C. I only tow two things, a small Scamp 1000 lbs travel trailer, or a trailer with 2 wave runners on them. I guess my water pump could be getting worn out, seeing that the car is 8 yrs old, but is there a way to check if it is becoming worn?? Thanks for all the help!

Brian Colwell proclaimed:

and click on the for owners link. When you get to the place where you can enter a request, give your VIN and ask for a build sheet

>

McNick proclaimed:

How hot does it get?

How fast are you driving when towing?

If you are not towing, how hot does it get?

Hills or flat?

The i-6 runs hot, but even in 100 degrees as long as you are moving at reasonable speed and not towing a tank up a mountain, it doesn't really get much hotter.

A higher core radiator would only cool as much as the thermostat and water pump allow. An oil cooler is never a bad idea and neither is a transmission cooler. Dunno if you could find the tow package pieces at a recycle yard or not, or as a kit online at a mopar parts dealer.

In hot weather and pulling the wave runners from the lake, it will get between 210 and the maximum that the gauge will go, so 3/4 the way up...Typically flat land, seeing that I live in kansas...ha.

I think I would check the thermostat for proper function (drop in a pan of hot water - should open shortly before boiling) or just replace it as they are real cheap.

When was the cooling system last back-flushed?

Have the radiator fins been checked to make sure it isn't clogged by bugs, leaves, debris?

Does the temperature go down when you turn the heater up?

What brand coolant?

What condition is the coolant in?

Is there a layer of slime coating the expansion tank?

How old is the radiator cap? Any signs of damage, corrosion, or age?

Have the function of the fan clutch been checked? (hot and cold)

How is the heater output? (Warm, hot, shades of Hades)