Dorman 800-604 Automatic Transmission Oil Cooler Line Connector

Dorman 800-604 Transmission Cooler Line Connector

The Dorman 800-604 automatic transmission oil cooler line connector is built to restore the connection between the transmission and the oil cooler. Made from steel with a straight fitting design, it is engineered to match the fit and function of a damaged original connector for leak-free performance.

Compatible with a wide range of Chevrolet, GMC, Buick, Cadillac, Pontiac, Oldsmobile, Hummer, and related GM applications, this connector is a direct-fit solution for transmission cooler line repair. It includes thread sealer and uses a quick disconnect on one end with a male thread on the other.

Key Features

• Steel construction for transmission cooler line service
• Straight fitting design for a direct replacement layout
• Quick disconnect end and 1/4-18 male thread end
• Includes thread sealer for the threaded connection
• Matches OE fit and function for cooler line repair
• Dorman 800-604 replacement connector for GM transmission oil cooler lines

Detailed Description

This transmission oil cooler line connector is designed to restore the sealed connection between the transmission and the oil cooler where the original connector has failed, cracked, or begun leaking. The steel body and OE-style dimensions support proper line routing and secure attachment in applications that use a 3/8-inch tube quick connect and 1/4-18 thread interface. The Dorman 800-604 is a practical repair part for vehicles such as Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Tahoe when the factory connector needs replacement.

This part cross-references Dorman - OE Solutions 905-203 and Airtex Fuel Pumps 4208 for the same application.

Common Repair Issues

• Transmission fluid leaking at the cooler line connector
• Damaged or worn quick-connect fitting at the transmission
• Loose threaded connection between the line and cooler circuit
• Corrosion or cracking in the original steel connector
• Poor sealing at the oil cooler line to transmission junction

Installation Notes and Tips

Verify the vehicle’s cooler line style before installation, since fitment notes vary by application. This connector is listed for oil cooler line to transmission use and is specified for vehicles without a ball check in the noted applications. Clean the mating surfaces, confirm the quick disconnect seats fully, and apply the included thread sealer to the threaded end before tightening to specification.

Fits 2008 Chevrolet Avalanche, N/A; Fits 2008 Chevrolet Colorado, N/A; Fits 1996-2008 Chevrolet Express 1500, N/A; Fits 1996-2008 Chevrolet Express 2500, N/A; Fits 2005-2008 Chevrolet Express 3500, N/A; Fits 1996-2002 Chevrolet Express 3500, N/A; Fits 2003-2008 Chevrolet Silverado 1500, N/A; Fits 2001-2008 Chevrolet Silverado 2500 HD, N/A; Fits 2007-2008 Chevrolet Silverado 3500 HD, N/A; Fits 2008 Chevrolet Suburban 1500, N/A; Fits 2008 Chevrolet Suburban 2500, N/A; Fits 2008 Chevrolet Tahoe, N/A; Fits 2008 GMC Canyon, N/A; Fits 1996-2008 GMC Savana 1500, N/A; Fits 1996-2008 GMC Savana 2500, N/A; Fits 1996-2008 GMC Savana 3500, N/A; Fits 2008 GMC Sierra 1500, N/A; Fits 2001-2008 GMC Sierra 2500 HD, N/A; Fits 2007-2008 GMC Sierra 3500 HD, N/A; Fits 2008 GMC Yukon, N/A; Fits 2008 GMC Yukon XL 1500, N/A; Fits 2008 GMC Yukon XL 2500, N/A.

Quality Assurance

Dorman manufactures replacement components engineered to match original equipment fit and function. Part number 800-604 is built as a direct replacement for the transmission oil cooler line connector used in the listed GM applications.