Hello Everyone. I have been reading though threads and threads about the Transmission Coolers in the WJ's. Well I have come to the conclusion that there really have not been any definitive answers because of the variety of different setups. Depending on what engine, what year, and if you have a tow package or not, can determine your setup.
For Example: My 2004 WJ with the 4.0 and the Factory Tow package (Including: The Mechanical Fan, 3.73 Gears, The Tow Bar, and the 7-Pin Harness). As for the transmission cooler from the 2003 and 2004 years according to the FSM there was no Auxiliary cooler because it was determined that one was not needed. BUT my transmission oil cooler is in the A/C CONDENSER and is NOT in the Radiator. (have pictures to prove below). While some o
So to my question. I am adding an auxiliary cooler because I am going to be towing and use my WJ harder the its "Grocery Getter" name. I planned on installing the Aux Cooler AFTER the factory cooler as recommended. BUT, for what ever reason, I can not decide or figure out for the life of me, which line is the RETURN line from the transmission cooler, back to the transmission. There is one line with a "check" or back-flow preventer valve. To me that would logically be on the line coming FROM the transmission and too the cooler to keep the radiator "full" so no priming is needed in the system.
Here are the transmission cooling lines going to the AC Condenser. (Driver Side)
These are the AC lines going to the AC Condenser. (Passenger Side)
You can see here that the bottom line has the "valve" on it. (Next to the oil pan, looking up towards the bottom of the engine
Then up to the AC Condenser Connection:
So finally, does anyone know which line is the return line, specifically on the 2004 and possible 2003 WJ with the 4.0? Thanks