About Used Auto Transmission Coolers
The transmission cooler keeps the automatic's fluid from overheating, and heat is the number one transmission killer. A used cooler restores protection after damage or clogging, and it is critical insurance when towing.
What an Auto Transmission Cooler Does
The auto transmission cooler removes heat from the transmission fluid, either in a tank inside the radiator, as a separate small radiator in front of it, or both. Hot fluid from the transmission circulates through the cooler and returns, keeping temperatures in the safe range that preserves the fluid and clutches.
Signs Your Auto Transmission Cooler Is Failing
- Overheating transmission, especially towing or in traffic
- A leaking or road-damage-crushed cooler
- A clogged cooler starving the transmission of flow
- Coolant-contaminated fluid from a failed in-radiator cooler
What to Check When Buying a Used Auto Transmission Cooler
- Check the fins and tubes for crush damage and leaks
- Flush any used cooler thoroughly before install, debris kills transmissions
- Match the fittings and line connections to yours
- Consider upsizing if you tow, more cooling is cheap insurance
Common Applications
Every automatic has some cooling, and trucks and tow vehicles add auxiliary coolers. Road debris, corrosion, and clogging take them out, and since heat destroys transmissions, a sound used cooler pays for itself many times over.
Related Parts
Frequently Asked Questions
Why is transmission heat such a big deal?
Heat breaks down the fluid, and degraded fluid glazes clutches and varnishes valve bodies: it is the leading cause of automatic transmission failure. Every bit of extra cooling extends the transmission's life, especially under towing loads.
Where is my transmission cooler?
Most vehicles cool the fluid in a tank built into the radiator, and many trucks add a separate small cooler in front of it. Follow the two steel lines from the transmission and they lead to your cooler or coolers.
What is the milkshake failure?
When the in-radiator cooler tank fails internally, coolant and transmission fluid mix into a pink milkshake that destroys both systems. It is why a failed radiator cooler means flushing the transmission immediately and replacing the radiator.
Why flush a used cooler before installing?
If the donor transmission ever shed debris, it is sitting in the cooler, waiting to flow into your transmission. A thorough back-flush before install is mandatory, cheap, and protects everything downstream.
