Transmission Cooler Recommendation for 2005 Toyota Highlander V6

Question:

I am under the impression my Highlander already has a cooler built into the factory radiator, is this correct? No tow package Not planning to do any towing, maybe some mountain towing. Also, the fluid needs a minimum temp as well, any danger of overcooling in normal conditions?

asked by: David

Expert Reply:

Most modern vehicles do now have a transmission cooler incorporated into the primary cooling system which allows engine coolant to also lower the temp of transmission fluid. Heavy-duty vehicles and vehicles that are tow-rated may also have a secondary external supplemental cooler installed. It is not really possible to over-cool transmission fluid so any temperature reduction you can achieve will tend to add to the transmission's working lifespan.

If your 2005 Highlander has the 3.3L V6 engine I recommend the Derale # D13503. This kit includes everything needed for installation. The cooler you referenced, Derale # D13502, is also a good choice. The goal is to install the largest size cooler you can fit into the available space in order to get maximum cooling efficiency.

The linked install video and articles on transmission coolers may be of interest to you.

expert reply by: Adam R