I have 2015 Silverado LTZ 4 door, 4 X 4. I have RPO code KNP Transmission Cooler. Now the "cooler" most automatics have is a pipe in the radiator tank and there is no code for that; it's part of the Transmission standard equipment. Can I assume this is a separate cooler (like a little radiator?) Where is it? I see nothing like a GM tranny cooler I have seen on the '04 S 10s... I looked through the grill....