As you know, the transmission cooler lines play an essential role in controlling your vehicle’s transmission temperature, and prevent it from overheating by transferring hot fluid to the radiator for cooling. If you need to replace or Remove these transmission cooler lines, here’s a handy guide to help you do it with minimal hassle.
Why did you move the transmission cooler line?
A few reasons why you may need to remove your transmission cooler lines are:
Over time, transmission cooler lines can wear out and leak, causing low fluid levels and possible transmission damage.
If you are upgrading or replacing your radiator or transmission cooler, you will need to disconnect these lines.
For specific repairs, removing the transmission cooler lines provides better access to other parts.
Usually these reasons require you to remove the transmission cooler lines but you may find it difficult to remove these lines, but with the right methods and tools you can do it easily.
You will need tools to do this
Wrench set or line wrench (often 3/8 or 1/2-inch sizes work for most vehicles)
Drain pan (to catch any liquid that may spill)
Screwdriver (flathead or Phillips, depending on clamps or fittings used)
Pliers (to loosen any clips or clamps on the line)
Transmission fluid (to top off after reconnecting the lines)
Make sure you have these tools ready before you begin, as they will make the process smoother. So you definitely need these tools
Step-by-step guide to removing transmission cooler lines
Ensure safety first
Before starting any work on your vehicle, make sure it is parked on a level surface, turn off the engine and let it cool down. Transmission fluid can reach high temperatures, so it’s best to work on a cold vehicle to avoid burns or spills.
Locate the transmission cooler lines
The transmission cooler line runs from the transmission to the radiator or external transmission cooler. Typically, they are located on the underside of the radiator and can be seen as two metal or rubber hoses from the transmission.
Position the drain pan
Place a drain pan directly below the lines where they connect to the radiator or cooler. When you disconnect the lines, some liquid may come out and this will help keep things clean in a pan.
Loosen any clamps or fasteners
Using pliers or a screwdriver, loosen the clamps or fasteners holding the transmission cooler lines. Some lines have simple hose clamps, while others can be secured with special fittings that require a specific wrench size.
Note: For lines secured with metal fittings, a line wrench works best because it reduces the chance of tearing the fitting.
Disconnect the line from the radiator
Carefully disconnect or pull the transmission cooler lines from the radiator or cooler. If the line is clogged, apply gentle pressure or use a flathead screwdriver to pry it off. Be careful, because transmission fluid may start dripping as soon as you disconnect the line.
Note: Sometimes, transmission cooler line connectors can be difficult to release, especially if corroded. Spraying some penetrating oil and letting it sit for a few minutes can ease stubborn fittings.
Disconnect the lines from the transmission
Repeat the process to disconnect the other end of the line from the transmission. As with the radiator side, be prepared for some fluid leakage, and make sure the drain pan is positioned to catch any spills.
Remove the line carefully
Once both ends are disconnected, gently pull the cooling lines. Transmission cooler lines can be delicate, so avoid bending or twisting them excessively. Set them aside carefully, especially if you plan to reinstall them later
Follow our special extra tips
If the fittings are corroded, you may need to apply additional force. Applying penetrating oil before starting can loosen the rust and make removal easier.
Avoid excessive fluid loss If you are concerned about fluid loss, you can use rubber caps or plugs to seal off the transmission and radiator ends after temporarily removing the lines.
Check for Wear and Tear When the cooling lines are out, inspect them for any signs of wear or damage. Catching a leak before it starts can save you trouble down the road.
After removal: cleaning and reinstallation
Once you’ve removed the transmission cooler lines, you plan to replace or reinstall them. Then follow this:
You will inspect the fittings, clean the radiator and transmission fittings Removing any dirt or buildup when you reinstall the lines ensures a clean, secure connection
If you are replacing old lines with new ones, make sure they match in size and shape for a proper fit.
Reconnect and refill fluid As after reinstallation, check the transmission fluid level and top it off if necessary. Transmission fluid lost during the process must be replenished to keep the transmission running smoothly.
FAQ
How can I prevent liquid from spilling everywhere?
To catch any transmission fluid that may leak, place a drain pan under the cooler lines before disconnecting them. You can also use rubber caps or plugs to temporarily close the radiator and transmission end to reduce fluid loss after disconnection.
Can I drive my car without a transmission cooler line?
No, you should not drive without a transmission cooler line. Without these lines, the transmission fluid cannot be cooled, which will lead to overheating and potentially fatal damage to the transmission.
How much transmission fluid will I lose when moving the lines?
You may lose a small amount of transmission fluid during the process. Keep a bottle of transmission fluid handy to top up the fluid level after reconnecting the lines.
How can I avoid damage to goods?
Using the correct wrench size for the fittings and a line wrench (flare nut wrench) can help prevent tearing or damaging the fittings. These wrenches provide a strong grip and reduce the chance of the nuts going round.
How do I check that I reinstalled the cooler lines correctly?
After reinstalling, start your car and let it idle. Inspect connections at both transmission and radiator for signs of leaks. If you see fluid dripping, tighten the fittings until they are secure.
Conclusion
One weekend, a friend of mine decided to replace his radiator and found he had to remove the transmission cooler lines first. Since he didn’t have the right equipment, it quickly became a challenging project.
However removing transmission cooler lines may seem like a daunting task, but with the right tools, some preparation and patience, it’s a job that can be done at home.
