I am about to drop my new 2 row radiator into my '91 XJ. I plan on buying a medium duty transmission oil cooler in the near future, and I also have a/c. My question is, will the tranny cooler, a/c condensor and two row rad be to crowded to allow sufficient airflow through the rad and cool the engine or will it cause too much heat?

 

nope mine came factory with a 2row rad, AC, and tranny cooler

 

Sweet. Thanks for the quick feedback. If I may ask one more q, the medium duty cooler I am getting is just to help keep the tranny cooler and the occasional hauling of 1000 pounds or less of stuff (hardly ever over 700 pounds). I should be more than covered right? Thanks again!

 

Yup. Just remember to splice the tranny cooler inline with the tranny lines coming from the radiator. Some people eliminate the radiator part that cools the tranny, but having both provides more cooling.

 

See, thats something I dont get.
The cooler is in the radiator, I dont think of it as a cooler. More of a heater, it will keep the trans temp ~200* witch to me seems pretty high (not sure what autos run at).

If its cold in the winter and medium hot (around 80 maybe) keep the radiator "cooler" and run your aftermarket cooler too. That way your fluid will be warmed quicker in the winter.

If its Hot where you live, get rid of the radiator cooler.

 

It's actually in the radiator? I thought it was tubes runnin beside it. I guess I was wrong. Anyways, I have been looking everywhere for the optimum running temp of the AW4 to no avail. I figured it would be around 200* since the engine runs around 210*. I wonder.. what if during the summer/spring I ran the lines through the seperate cooler and plug off the radiator cooler/heater/w.e it is, then during the winter block off the cooler and hook up to the rad? But then I guess gunk could build inside the one blocked off since it would just be sitting there.. I think I will just hook both up.

 

Remember the coolant stays in the radiator to cool down until the thermostat opens up. That's the whole point of having a thermostat, so the coolant has more time to cool off in the radiator.

Edit: Yes, the stock cooler is actually in the radiator, Driverside side cap.

 

Not to TJ, but I thought the thermostat was to help get the engine up to operating temp, then open up to allow it to maintain that temperature? Not to stay closed and keep the fluid in the radiator to keep the fluid cool.

The thermostat is a valve located in the cooling system of an engine, which is closed when the engine coolant is cold and opens gradually in response to the engine heating and thereby controlling the temperature of the coolant and rate of coolant flow through the engine block.

 

The thermostat has a temperature rating. The rating means it will open when it hits that certain degree. Like a 180 degree thermostat will open up when the coolant around it hits 180 degrees. So yeah it keeps your engine at the right running temp. by letting the coolant in the radiator cool down for a certain period of time.

 

From my 00 FSM 1991Jeep_Man

FLUID LEVEL CHECK PROCEDURE

(1) Transmission fluid must be at normal operating
temperature for accurate fluid level check. Drive
vehicle if necessary to bring fluid temperature up to

normal hot operating temperature of 82°C (180°F).

 

You are awesome! Thank you!

 

NP