Dorman 66236 Automatic Transmission Oil Cooler Line Connector O-Ring

Automatic Transmission Line O-Ring Seal

Dorman 66236 is an automatic transmission oil cooler line connector O-ring for Ford, Lincoln, and Mercury applications that use a serviceable line seal. It provides a direct replacement for the original O-ring when the transmission cooler line is disconnected during service, helping restore a secure seal without replacing the entire line assembly.

Built from rubber with a round profile, this black O-ring is sized for the specified connector applications and is commonly used on Ford F-150, Expedition, and Mustang models, along with select Lincoln Navigator and Mercury Milan vehicles. If you are searching for a Ford transmission cooler line O-ring replacement, Dorman 66236 offers an OE-style service part solution.

Key Features

• Automatic transmission oil cooler line connector O-ring
• Direct replacement for serviceable transmission line seals
• Rubber construction with round seal profile
• Black finish
• Inside diameter: 0.489 in.
• Outside diameter: 0.635 in.
• Thickness: 0.07 in. / 0.103 in.
• Universal fit within the listed Ford, Lincoln, and Mercury applications

Detailed Description

Ford does not always offer the original cooler line O-ring separately, which can leave technicians with limited options after disconnecting a transmission line for maintenance. Dorman 66236 addresses that service issue by supplying a direct replacement seal for the affected connector applications. This helps you replace the worn O-ring itself instead of replacing the complete transmission line assembly.

This part cross-references Ford service numbers such as 2L1Z7D273BB and 8C3Z7R081C for the same application. It is a practical choice for transmission cooler line service on vehicles including the Ford F-150, Ford Expedition, and Lincoln Navigator, as well as select Ford Escape and Mercury Mariner models.

What It Helps Solve

• Transmission fluid seepage at the cooler line connector
• Damaged or flattened O-rings after line disconnection
• Need to replace a seal without replacing the full line assembly
• Service delays caused by unavailable OE O-rings
• Leak concerns after transmission cooler line maintenance

Installation Notes and Tips

Inspect the connector and sealing surface before installation. Clean the mating area thoroughly, and replace the O-ring if it shows cuts, flattening, or hardening. Lightly lubricate the seal with the correct transmission fluid before reconnecting the line to help prevent pinching and improve seating. Verify proper engagement after installation and check for leaks once the system is back in service.

Fits 2001-2014 Ford F-150, N/A; Fits 2008-2019 Ford Expedition, N/A; Fits 2010-2014 Lincoln Navigator, N/A; Fits 2010-2012 Ford Fusion, N/A; Fits 2009-2012 Ford Escape, N/A; Fits 2009-2011 Mercury Mariner, N/A; Fits 2010-2011 Mercury Milan, N/A; Fits 2011-2014 Ford Mustang, N/A; Fits 2008-2016 Ford F-250 Super Duty, N/A; Fits 2008-2016 Ford F-350 Super Duty, N/A; Fits 2011-2016 Ford E-350 Super Duty, N/A; Fits 2012 Ford E-250, N/A; Fits 2001-2005 Ford Expedition, N/A; Fits 2001-2004 Lincoln Navigator, N/A; Fits 2004 Ford F-150 Heritage, N/A; Fits 2002 Lincoln Blackwood, N/A.

Quality Assurance

Dorman OE FIX parts are engineered to address common service problems with direct replacement solutions. Dorman 66236 is built to match the sealing needs of the listed applications and support reliable transmission line service on compatible Ford, Lincoln, and Mercury vehicles.