1. Safety First:
* Cool Down: Let the vehicle cool completely. The transmission fluid will be hot and can cause serious burns.
* Gloves & Eye Protection: Wear gloves to protect your hands from the transmission fluid (it's messy and can irritate skin) and eye protection to shield from any potential splashes.
* Drain Pan: Have a drain pan ready to catch the fluid that will spill from the lines. Transmission fluid is harmful to the environment, so proper disposal is crucial.
2. Preparation:
* Locate the Lines: The transmission cooler lines are typically connected to the radiator's top tank near the other coolant lines. They're usually smaller in diameter than the coolant lines.
* Identify the Lines: Some vehicles have labels or markings indicating which line is the "in" and "out" for the transmission fluid. Note their position before disconnecting. If you can't identify them, it's best to photograph them before disconnecting to help with reassembly.
* Gather Tools: You'll likely need a socket wrench and possibly a pair of line wrenches (especially if the lines are tight). A rag or shop towels are essential for cleaning up spills.
3. Removal Procedure:
* Disconnect the Lines: Using the appropriate wrench, carefully loosen and remove the retaining clamps holding the transmission cooler lines to the radiator. Work slowly and carefully, as the lines may be brittle or seized. If they're particularly stubborn, consider using a penetrating lubricant (like PB Blaster) beforehand, allowing it time to soak in.
* Support the Lines: As you loosen the connections, support the lines to prevent them from dangling and potentially damaging the radiator or other components.
* Catch the Fluid: As you loosen the connections, be prepared for a small amount of fluid to spill. The drain pan is essential here.
* Remove the Lines: Once the lines are loose, carefully separate them from the radiator fittings.
4. Clean Up:
* Wipe up Spills: Clean up any spilled transmission fluid immediately.
* Dispose Properly: Dispose of the used transmission fluid responsibly according to your local regulations. Auto parts stores often accept used oil and transmission fluid for recycling.
5. Reassembly (When reinstalling):
* Clean the Fittings: Before reconnecting the lines, clean the radiator fittings and the ends of the transmission cooler lines to remove any debris.
* Reconnect the Lines: Carefully reconnect the lines to the radiator fittings, ensuring a secure connection.
* Tighten Clamps: Securely tighten the retaining clamps.
* Check for Leaks: After reconnecting everything, check for leaks.
Important Considerations:
* Line Condition: Inspect the condition of the transmission cooler lines while they're disconnected. If they are cracked, kinked, or severely corroded, they should be replaced.
* Radiator Condition: Inspect the radiator connections for damage. If the radiator fittings are damaged, the radiator may need to be replaced.
If you're not comfortable performing this task yourself, it's best to take your vehicle to a qualified mechanic. Working with transmission fluid can be messy and improper handling can lead to further problems. Remember, safety and proper disposal are paramount.
