Silverado 1500 Transmission Cooler Lines Inlet and Outlet 85043951

This is a complete inlet and outlet transmission oil cooler line assembly for 2016-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 with the 4.3L V6, 5.3L V8 or 6.2L V8, plus 2016-2017 GMC Yukon and Yukon XL (5.3L, 6.2L) and Cadillac Escalade and Escalade ESV (6.2L). It carries reference numbers 85043951 and 5802112. The feed and return lines come as one formed assembly with steel tube sections and crimped hose sections, rated at 1,500 psi working pressure and 8,700 psi burst.

On these trucks the cooler lines rust at the crimped joints and along the frame, and the first sign is usually ATF dripping onto the crossmember or a wet line near the radiator. Keep driving on a leaking line and the transmission runs low on fluid, which leads to slipping, flare shifts and burned clutches. Replacing both lines together is faster than patching one and finding the other rusted the next time the truck is on the lift.

To install, catch the fluid, disconnect the lines at the transmission and at the radiator cooler fittings using the correct quick-connect release, and unclip them from the frame retainers. Route the new lines along the original path and push each quick-connect in until it clicks, then pull back on it to confirm it is locked. Top off the fluid to the correct level with the engine running at operating temperature and check every connection for leaks.