Finding Transmission Cooler Return Line on a 2011 Chevy Silverado 1500 4.8L

Question:

from the radiator witch line is the return/cool line the one on top or the one on the bottom thanks

asked by: Myron

Expert Reply:

When we installed a transmission cooler on a very similar Chevy Silverado we found that the return line was the one that was on the driver side of the factory cooler. We tested this by starting the vehicle when it was cold and feeling the lines as someone in the driver seat of the truck put the transmission in drive (with brakes firmly applied), and then slightly raised the RPM. The cooler line is the return line.

See the install video I attached for more info.

expert reply by: Jameson C