How to Repair Leaking Transmission Cooler Lines

Leakage of transmission cooler lines can be a big problem. Repairing the lines may solve your problem on temporary basis. However this may not stay for long. The best solution would be to replace the cooler lines with new ones. This is how you are going to fix things wisely. Transmission cooler lines are actually a collection of hoses. These lines start from the transmission and end at the radiator. The main role of these lines are to carry hot transmission fluid towards the radiator to make it cool. After cooling, the fluid is allowed to circulate through the engine. Leakage of transmission cooler lines results in inadequate transmission levels of fluid inside the car. This can result in heavy damage to the engine, due to overheating and grinding of the gears. Hence, it is important to fix these lines in a timely manner, to avoid any complications in future. The overall process of fixing these lines takes about 60 minutes. A little efforts made towards this task, saves you a lot of money on costly repairs in the long run. The procedure to repair the leaking transmission cooler lines are given below.

Things You Will Require

  • Socket wrench
  • 2 Jack stands
  • Flare nut wrench 
  • Collection pan
  • Transmission fluid
  • Funnel

Step 1: Raise the Car

You need an even surface for this. Park the car, and raise it up using 2 jack stands. If the engine is hot, you need to wait for about 30 minutes, to allow the engine to cool down before getting under the vehicle.

Step 2: Locate the Drain Pan

Next, locate the vehicle’s transmission drain pan. It is a large pan made of metal and bordered by bolts. Put a collection pan under this drain pan. Using a socket wrench, remove the drain bolt situated in the central part of the drain pan and let it drain for about 10-15 minutes for drainage. Replace the drain bolt.

Step 3: Locate the Cooler Lines

The transmission cooler lines in the vehicle have to be located first. They run from the transmission towards the bottom of the radiator. The actual number of cooler lines may vary from one vehicle to another, however, there are usually 1 or 2. Remove the nuts that link the hoses to the transmission and the radiator, using flare nut wrench.

Step 4: Replace old Transmission Lines

Replace the old transmission lines with new hoses. Attach these lines to the car using the old nuts.

Step 5: Locate Transmission Dipstick

Pop the engine hood to locate the transmission dipstick. Now, pull the dipstick out. Place a funnel inside the tube and pour in the appropriate quantity of transmission fluid. The quantity of fluid to be poured is specified in the owner's manual. 

Step 6: Replace Dipstick

The last step is to replace the dipstick and close the hood of your vehicle.

Tips And Warnings

  • If the fluid has acquired a dark brown color and a metal grit, it shows that there is a transmission problem.
  • Take extreme care when working with automobile fluids.