External Auto Transmission Cooler
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External Auto Transmission Cooler
External Auto Transmission Cooler
External Auto Transmission Cooler - View 2
External Auto Transmission Cooler - View 3
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External Auto Transmission Cooler
External Auto Transmission Cooler
External Auto Transmission Cooler - View 2
External Auto Transmission Cooler - View 3

Product Description

Extend the life of your Automatic Transmission with this high capacity external cooler.

This external cooler will keep your transmission fluid temperature cooler and prevent premature breakdown of the ATF.

From the manufacturer some Nissan models with automatic transmissions had a small transmission fluid cooler incorporated into the radiator.  One of the main problems with the ATF cooler in that is in side the lower part of the radiator is that it's design with internal cooling fins means that debris and metal particles from the transmission get stuck inside and can't be flushed out.  If you have a problem with your transmission the cooler int he radiator often gets clogged up or contaminated.  If you rebuild or replace the transmission the cooler must be replaced to prevent damage to the fresh transmission.  Nissan dealerships know this and often just charge customers for an entire new radiator.  We feel that adding an external cooler and bypassing the contaminated cooler in the radiator is more practical option.  The deign of the external cooler is such that it doesn't have to be replaced in the event of a transmission problem as long as the lines and the external cooler are thoroughly flushed out.

Transmission Cooler dimensions

  • 6" Tall
  • 11" Long
  • 1" Thick

External Auto Transmission Cooler

Brand: Hayden
Fits models: 300ZX / 350Z / 370Z / 2000-2003 Maxima / 2004...
External Auto Transmission Cooler
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$79.99

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External Auto Transmission Cooler
$79.99
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Nissan Matic-S Automatic Transmission Fluid (ATF)
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Questions our customers have asked

Does it use the oem cooler hose ?
These cores use 3/8" cooler hose, we recommend replacing with new when installing.
Do i close up the ports on the radiator since im going to be running those lines to the cooler instead ?
Yes we generally cap them but it is not required.

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What our customers say

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May 13, 2026
This setup is a must for the 7AT and it was simple to install and significantly lowers the temperature.
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May 3, 2025
Works as advertised for my 2010 Armada! For those wondering, I got a mounting bracket from amazon and attached it on the hood latch mount point. Got the trans hoses from autozone and used worm clamps.
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August 20, 2024
Had to custom mount this, but it works perfectly
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March 12, 2023
Best investment to keep transmission temps steady as possible when it comes to banging through gears. Also to eliminate the risk of coolant mixing with the Tranmission fuild if the radiator ever fails/crack.
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April 26, 2021
this was eazy to install. i added a transmission temp. sensor and it has kept mine at 180 drgrees.