Hayden 679 Automatic Transmission Oil Cooler

Hayden 679 Trans Oil Cooler Overview

The Hayden 679 Trans Oil Cooler is a plate-and-fin automatic transmission oil cooler built for vehicles that need added fluid temperature control. With an 11" x 11 5/8" footprint, aluminum construction, and a black finish, it is a performance-rated Rapid-Cool unit for direct auxiliary cooling support.

It is a strong fitment match for a wide range of trucks, SUVs, and performance vehicles, including Toyota 4Runner, Tacoma, Tundra, and Ford F-150 applications. If you are replacing or adding an external transmission cooler, Hayden 679 gives you a compact hose-barb connection layout and bracket mounting for straightforward placement.

Key Features

• Part number: Hayden 679
• Rapid-Cool plate-and-fin transmission oil cooler design
• Aluminum core with black finish
• Overall size: 11" x 11 5/8"
• 30-core-row construction
• 3/8" male hose barb connector
• Bracket-style mounting with mounting hardware included
• Performance rated for transmission fluid cooling

Product Details

Hayden Trans Oil Cooler 679 is designed as an automatic transmission oil cooler for vehicles that benefit from lower transmission fluid temperatures under towing, hauling, stop-and-go driving, or performance use. The plate-and-fin layout promotes efficient heat transfer, while the compact 11-inch by 11 5/8-inch size helps it fit a broad range of front-end packaging layouts. This part cross-references Four Seasons 53008 for the same application.

Compatible With 2003-2021 Toyota 4Runner, 2005-2021 Toyota Tacoma, 2005-2021 Toyota Tundra, 2010-2015 Ford F-150, and 2008-2021 Toyota RAV4 applications, among many others listed in the fitment data. The Hayden 679 part number is also associated with a wide interchange network, making it a practical replacement reference when matching an existing cooler by size and connection style.

Common Uses

• Helps address elevated automatic transmission fluid temperatures
• Supports towing and hauling duty in trucks and SUVs
• Helps reduce heat load in stop-and-go driving
• Supports transmission cooling on performance-oriented vehicles
• Replaces a damaged or restricted auxiliary transmission cooler

Installation Notes

• Verify cooler dimensions, inlet/outlet style, and available mounting space before installation.
• Use the 3/8" hose barb connection with properly sized transmission cooler hose.
• Mount the cooler securely using the included bracket hardware.
• Confirm line routing clears moving parts, hot exhaust components, and sharp edges.
• Flush the transmission cooler circuit as needed before placing the unit into service.

Quality Assurance

Hayden manufactures this transmission oil cooler as a performance-rated cooling component for automotive use. Part number 679 is built with aluminum construction and a plate-and-fin core design to support consistent fluid cooling in demanding driving conditions.