Transmission Cooler Line Identification for Line Replacement

Question:

I have a weeping transmission cooler line on my 2005 Dodge Durango, limited. 5.7L engine. How do I tell if the problem hose is the pressure line or not? It is the Drivers side line at the Radiator. I am assuming the calling it the supply line would be synonymous with calling it the pressure line. But Id rather not take that chance and be wrong when Im half way through the job and have to wait for the right part. photo included.

asked by: Caleb J

Expert Reply:

The best way to determine which line on a transmission cooler is the return line from the radiator is to use the following procedure:

1. Start engine while engine is cold
2. Place transmission shift lever in drive for no more than 10 seconds
3. Place in Park, stop engine, and remove keys
4. Identify the oil return line by feeling both oil lines. The coolest line is the oil return line.

On the aftermarket transmission cooler the ports are not input specific or output specific. It is not directional so you can choose either port for either function. You will want to choose the inlet or outlet port location by what will make your installation easiest.

I tried looking up your vehicle specifically but got conflicting info.

expert reply by: Jameson C