How to Replace a Transmission Cooler Line

If you have red fluid leaking from the front of your vehicle, chances are through transmission cooler line and needs to be replaced. Hi! I'm Barbara Terry with AutoMD.

If you had not replaced the transmission cooler line immediately, it will cause internal damage within your transmission.

Parts and tools needed:

For this project, you will need replacement transmission fluid lines and transmission fluid. You will also need a floor jack, jack’s stands, a set of sockets and ratchets, a flashlight, a drain pan and a screw driver. Your own vehicle’s components and parts may differ so always refer to your vehicle’s owner’s manual for details.

Always think safety first. I recommend using safety goggles, gloves and closed toed shoes whenever working on your vehicle. The use of an aftermarket jack can work much quicker than a manufacturer’s. In the case of this video, we are using a new hydraulic lift.

Park your vehicle on a level surface. This will ensure your car will not roll or lean when lifting it with a jack. Secure the vehicle with jack stands on both sides for safety before starting any work on the underside of your vehicle.

Do not rely solely on the jack to hold the car up while you are working. Locate the transmission cooler hard lines that run into the radiator and inspect them for leaks. Disconnect the transmission cooler lines at the transmission and drain the fluid into a drain pan.

Remove the damaged transmission cooler lines and replace them with new transmission cooler lines. Make sure the new lines are attached at the radiator the transmission and any other hangers that have been suspended from. Fill the transmission with the recommended fluid to the proper level.

Start the vehicle and check the transmission dipstick to make sure that the fluid is at its proper level and test ride the vehicle to make sure the leaks are repaired.

On behalf of AutoMD, I'm Barbara Terry with how to replace your transmission cooler line.