Transmission Cooler Lines Leaking at Radiator: What You Need To Know?


Have you ever encountered a case like the transmission cooler lines leaking at the radiator? What are the symptoms of such situation, and how are you going to deal with it?

For every car owner, transmission fluid acts as the lifeblood of their precious car. It doesn't only get rid of heat from the transmission's internal parts but activates gear changes with the use of hydraulic pressure.

When it comes to cooling the coolant or radiator fluid, the radiator of your engine plays an integral role. It keeps the engine functioning at the right temperature. In most cases, the radiator cools the automatic transmission fluid. 

Transmission Cooler Lines Leaking at Radiator

Transmission cooler lines leaking at the radiator puts car owners in a distressing situation. So, as soon as the transmission cooler lines at the radiator of your car are starting to leak, you should immediately take necessary steps to prevent a further issue from arising. 

What Are the Common Symptoms of A Leaking Transmission Cooler Line?

A small type of radiator, the transmission cooler is full of hot ATF or Automatic Transmission Fluid. To enable cooling, the ATF is pumped from the transmission to the car's front. As soon as the transmission cooler line in your car is starting to leak, you need to do initial stages to avoid risky situations in the long run.

Among the symptoms of a leaking transmission cooler line includes:

Automatic Transmission Shifting Hard

The fluid transmission can be low if the leak within the hydraulic transmission lines goes to the transmission cooler. Any transmission that has a lower amount of fluid than it needs to function correctly will potentially lead to a sharp shift in any equipment. If you left it unattended, transmission slippage may likely occur. 

Automatic Transmission Shifting Hard

Creates a Strawberry Milkshake Color

You can see a strawberry milkshake color when the transmission and coolant mix. Usually, the red automatic transmission fluid over powers the color of the coolant. The possibility of breakage or corrosion and coolant leakage into the ATF may be high if the ATF cooling system and the engine cooling system cross each other.

Fixing A Leaking Transmission Cooler Lines

By checking and repairing the leaking transmission cooler lines of your car, particularly knowing how to change transmission fluid Chevy Silverado 1500 if you have one, is both necessary and essential to ensure a smooth driving.

So, the lines to the transmission cooler on your vehicle are starting to leak quite a bit more than usual and you badly want to repair it as soon as possible. It is never a good idea to drive your car with the transmission fluid below the lowest level.

There are many products you can depend on to fix the problem easily and quickly, such as the Transmission Seal Stop Leak Product. Afterward, check the level of your transmission fluid. If you see the level has reduced below the minimum point specified by the dipstick, top it off by the transmission fluid indicated in the owner's manual. Now, you are completely ready to drive again.

You can watch the video below to get a clear idea on repairing the leaking transmission cooler lines.

It is advised to make fixing of a leaking transmission fluid a regular habit not just on times where you will experience problems, so that further issues can be prevented. 

Concluding Thoughts

Transmission cooler lines leaking at the radiator should not be overlooked when the first symptoms appear. Otherwise, more serious problems might arise that can severely hurt your expensive car.

Transmission Cooler Lines

Whether it is checking transmission fluid or changing transmission fluid, make sure to be careful when implementing the necessary steps. These processes can be done on your own, providing you have the tools needed and in-depth knowledge. Hiring an expert is still the safest option.

Like this article? Share with us your thoughts by leaving a comment below. We will be delighted to entertain your queries and suggestions. Also, share this post with your friends who have struggled checking and changing transmission fluid!


Hi there! I’m Jordan, chief editor of Crush the Road and I’m a self-confessed automative fanatic. Cars or vehicles has always been a passion of mine and will always be my favorite pastime. Now that I am married and has one adorable son, I have the time to write and share my personal experiences with other automative enthusiasts like me. Welcome to my fantastic blog!

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Andy - December 7, 2018

Your explanation of cooler line Transmission fluids leaks enabled me to logically determine where the leak was coming from and also the important reason for fixing it immediately. Thank you much.cool as a jewel.


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