The primary function of a transmission oil line is to carry hot transmission oil away from the transmission to the external cooler. The oil is cooled, then cycled back to the transmission through an outlet hose. Here are some steps on how you can install transmission oil lines on your vehicle.
Required skill level: Novice
Needed tools and materials
- Electrical drill
- Drip pan
- New cooler line
- Transmission fluid
- Floor jack
- Jack stands
- Flare-nut wrench
Preparing for the task
You will need at least two hours for the transmission if the vehicle has recently been operated. Once the transmission cooled, lift the car with a floor jack and place jack stands under the vehicle's frame. After that, place a drip pan under the transmission.
Removing the cooler lines from the transmission
The cooler lines are on the passenger side of the transmission on most vehicles; both lines are made of brass. Pull these lines out of the transmission underneath the vehicle and allow any fluid to drain into the drip pan, capturing any fluid that escapes from the lines. After that, loosen the integral nut on the end of each line with a flare-nut wrench and pull the lines away from the radiator.
Reconnecting the cooler lines
Place the tip of the oil cooler lines and their opposite ends against their fittings on the side of the transmission, then tighten the lines' integral nut with a flare-nut wrench. After these are done, you can now raise the vehicle with a jack, remove the jack stands from underneath the vehicle's frame, and lower the vehicle to the ground.
Final touch-up steps
Add transmission fluid to the cooler lines to complete the replacement. Turn the engine on, depress the brake pedal, and shift through gears. After that, turn the engine off, and then withdraw the transmission's dipstick tube. Finally, pour transmission fluid into the dipstick tube, and check the fluid level with the dipstick until the "Full" mark is reached.
Checking the installation
Start your engine, with the transmission selector lever in Park, letting it run at fast idle for one or two minutes. Stop the engine and check all connections for leaks; you might want to also check the transmission fluid level according to the manufacturer's instructions and add fluid if necessary.