Transmission Cooler Recommendation to Replace a Faulty Cooler in a 2006 Nissan Xterra  

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Expert Reply:

Aftermarket transmission coolers are typically marketed as supplemental coolers, not replacement coolers. If you are looking to replace your OEM transmission cooler due to a leaky or damaged cooler, then you will want to install the largest transmission cooler that will fit in the space available. The ideal place to install this cooler would be in front of the AC condenser or radiator to allow for adequate air flow.

I would recommend looking at the Derale Series 9000 Plate-Fin Cooler, # D13613. This transmission cooler is 11 inches wide by 11-3/8 inches tall by 1-1/4 inches deep and features the efficient plate-fin design. You will want to measure the space that you have available to determine if this transmission cooler will fit.

I have attached a link to all of the transmission coolers that we carry for you to check out if you have less space available to install a cooler.

To connect your transmission lines to the transmission cooler, I recommend using compression fittings. Choosing the correct compression fitting will depend on the size of your transmission lines. If you have 3/8 inch lines, then you can use fitting # D13032. For 1/2 inch lines, use fitting # D13033 and for 5/16 inch lines, use # D13031. Be sure you plug the holes on the OEM transmission cooler to keep fluid from leaking.

You will also want to install a temperature gauge so you can monitor the transmission fluid to ensure the fluid remains under 200 degrees Fahrenheit. I recommend installing the Derale Remote Transmission Filter Kit, # D13091. This kit includes the temperature gauge and will install inline with the line that carries the fluid to the cooler to monitor the temperature of the fluid leaving the transmission. This is typically not much of an issue in colder climates, but you will need to be cautious in warmer weather. Overheating is a leading cause of transmission failure.

I have attached two FAQ articles on transmission coolers

expert reply by: John H

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