Frequently Asked Questions

The Tru-Cool Advantage

What are the benefits of a Tru-Cool cooler over traditional tube & fin designs?

Tru-Cool coolers feature a number of plates, so automatic transmission fluid can flow more efficiently. In addition, you get more live surface area, which delivers even greater cooling power. And Tru-Cool coolers are designed and manufactured to ensure greater durability than you get from tube & fin coolers.

Why does a smaller Tru-Cool cooler work better than larger tube & fin models?

Compared to Tru-Cool, tube & fin coolers are far less efficient, with more dead space that does not add to their cooling power. Tru-Cool coolers are built with a stacked plate design, which puts most of the oil close to surfaces that are in contact with passing air. That’s why Tru-Cool coolers are up to 30% more efficient than tube & fin designs.

Tru-Cool Installation

Where will the Tru-Cool cooler deliver the best results?

If possible, locate the cooler in an area where it will be exposed to ram air and help maximize cooling. Install the cooler in series and downstream of the radiator in-tank oil cooler. This maximizes the heat transfer and decreases transmission warm-up times in colder weather. Most OEM installations are plumbed this way.

How should I mount the oil cooler fittings?

Fittings can be located up, down or sideways. Combine that flexibility with a compact design and it’s clear that Tru-Cool offers distinct advantages that enable quick, easy design.

Which cooler should I use for a diesel application?

The cooler’s fittings should not be smaller than the transmission line, which are often large in diesel applications. Using smaller lines will restrict the transmission’s fluid flow.

Should I disconnect the radiator in-tank oil cooler when I install a Tru-Cool cooler?

Do not disconnect the in-tank oil cooler if you can avoid it. Your in-tank cooler offers additional cooling and helps preheat the transmission. In colder climates the in-tank cooler should never be disconnected from the system.

Additional Tru-Cool Questions

Will installing an oil cooler affect my customer warranty?

It could, depending on which cooler you install. Tube & fin coolers are very flow-restrictive, so vehicle manufacturers usually do not approve of them. LPD coolers, however, are the only coolers currently being used in OEM factory installations. Contact your local dealer for more information.

The fittings supplied do not work with my application. What should I do?

Tru-Cool has supplied fittings for the four most common applications. Compression fittings can be purchased separately from your local distributor. Refer to the following part numbers:

  • 735-9139 for 5116 lines
  • 735-9140 for 318 lines

Will installing an oil cooler in front of the radiator increase the engine’s operating temperature?

Not normally. An auxiliary oil cooler will decrease the temperature in the radiator in-tank cooler, which in turn puts less load on the radiator. From a total system standpoint, the engine’s operating temperatures should vary little from what they were before the oil cooler was installed.