How to Install Transmission Cooler Lines to Radiator

1. Begin by disconnecting both the transmission cooler line and radiator fitting from their respective sides of the engine bay. Use a wrench to loosen them, then pull the lines away from each other until they are fully disconnected. 2. Once this is done, use a pair of pliers or an adjustable wrench to remove any clamps that may be present on either end of the old lines if necessary.

3. Now fit one end of your new transmission cooler line onto where it was previously attached on the transmission side and tighten with a wrench or an adjustable wrench as needed to secure it in place. 4. Place the other free end into its intended spot located at the backside of your radiator and hold it firmly in place before you begin tightening it down with a wench or adjustable wench as required for proper installation . 5. After this has been done, reconnect all hoses that were removed during disassembly earlier as well as any clamps which may have also been taken off beforehand before you move onto attaching new ones if necessary .

  • Step 1: Start by disconnecting the negative battery terminal
  • Doing this will prevent any electrical shocks or potential damage to your vehicle from occurring while you’re working on it
  • Step 2: Locate and remove the existing lines connected to the radiator, making sure that all of the fluid is drained out before doing so
  • Step 3: Install new transmission cooler lines into place, being careful not to cross thread them as you do so
  • Make sure they are tightened down securely, but be gentle and don’t overtighten them either as this could cause leaks in the future
  • Step 4: Connect one end of each line to their respective ports on the radiator and then fasten them in place with a wrench or screwdriver if necessary
  • Step 5: Use an appropriate type of hose clamp for sealing both ends of each line onto its corresponding port on the radiator, making sure that it is tight enough without over-tightening it (which can lead to cracks)
  • Step 6: Reattach your transmission fluid reservoir back onto its mounting position after installing all new hoses and clamps correctly around both sides of your radiator core support area
  • Step 7 : Recharge your system with fresh coolant before starting up your engine again once everything has been installed properly and secured tightly in place

The ‘Right’ Way To Install a Transmission Cooler

How Do Transmission Cooler Lines Connect to Radiator?

Transmission cooler lines connect to the radiator in two ways. The first connection is through a metal or rubber hose that runs from the transmission’s oil pan to an adapter on the radiator. This line helps cool down hot transmission fluid as it passes through the system.

The second way is with an additional set of steel lines that run from the transmission to each side of the radiator core support, allowing for even better cooling efficiency and heat transfer. To ensure a proper seal between these components, clamps are often used to secure them tightly together at both ends. Additionally, some vehicles may require specialized fittings such as O-rings or gaskets in order for everything to be connected properly.

What Transmission Line Goes to the Radiator?

The transmission line that goes to the radiator is typically a rubber hose. It carries hot, pressurized coolant from the engine to the radiator, where it can be cooled by air passing through the fins of the radiator core before returning back to circulate throughout the system and absorb more heat from other components. Over time, this hose can become brittle or cracked due to extended exposure to high temperatures and pressures, so checking for any signs of damage should be part of your regular maintenance routine.

Does a Transmission Cooler Go before Or After the Radiator?

A transmission cooler should always be placed after the radiator in order to ensure optimal cooling. This is because the transmission fluid has already been heated by the engine, and placing a cooler before the radiator would not allow it to cool off efficiently. The transmission cooler works best when it is placed downstream from the radiator, so that it can receive coolant which has already been cooled by passing through the radiator.

This allows for maximum efficiency of heat transfer between components and ultimately results in better performance of both essential systems.

Does It Matter Which Way You Mount a Transmission Cooler?

Yes, it does matter which way you mount a transmission cooler. If the lines are run horizontally and against gravity, then air can become trapped in the cooler and cause a reduction of cooling performance. It’s best to mount your transmission cooler vertically with the fittings at the top so that any air pockets will be eliminated from the system and coolant will flow freely throughout.

Additionally, mounting your transmission cooler in this manner also prevents oil starvation by preventing air pockets from forming around vital components such as bearings or gears. Properly mounting your transmission cooler is an important part of ensuring optimal performance for both safety and longevity purposes.

How to Install Transmission Cooler Lines to Radiator


Bypass Radiator Transmission Cooler Or Not

If you’re considering whether or not to install a bypass radiator transmission cooler on your vehicle, it’s important to understand the pros and cons of doing so. A bypass radiator transmission cooler can help prevent heat-related damage by providing additional cooling capacity for your vehicle’s transmission fluid, but it also increases the amount of time and money spent on maintenance due to its complexity. Ultimately, whether or not you decide to install a bypass radiator transmission cooler should be based on an assessment of your individual needs and preferences.

Transmission Cooler Installation near Me

If you’re looking to have a transmission cooler installed, it’s best to find an experienced professional that can provide quality work. Fortunately, there are many reputable mechanics and auto shops in your area that specialize in transmission cooler installation. Be sure to research the shop beforehand through online reviews or recommendations from family and friends, so you know you’ll be getting the highest quality service possible.

External Transmission Cooler Only

An external transmission cooler is an important component of any vehicle with an automatic transmission. It helps to keep the vital fluids in your car from overheating by transferring heat away from the engine and transmission, thus helping to extend its life. Not only does this help improve the performance of your vehicle, but it can also save you money on costly repair bills down the road.

Many experienced mechanics recommend installing an external transmission cooler for optimal protection and longevity of your car’s most important components.


Installing transmission cooler lines is an important maintenance step that should be done regularly to keep your car running smoothly. By following the steps outlined in this blog post, you can easily install the lines yourself and help ensure your car’s performance. With a few simple tools and some basic knowledge of automotive mechanics, you can have your transmission cooler lines installed quickly and efficiently.

Taking care of these important components will help maintain the longevity of your vehicle for years to come.


  • Alex Gearhart

    Alex Gearhart, an automotive expert specializing in transmissions, has over a decade of hands-on industry experience. With extensive knowledge in manual and automatic systems, Alex is passionate about educating car enthusiasts on vehicle maintenance. As the chief author at, Alex simplifies complex concepts for readers, helping them make informed decisions about their vehicles. Outside of work, Alex enjoys road trips, restoring classic cars, and exploring new automotive technologies.

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