Dorman 800-5604 Automatic Transmission Oil Cooler Line Connector

Automatic Transmission Cooler Line Connector

Dorman 800-5604 is an automatic transmission oil cooler line connector made from steel for a direct-fit repair at the transmission-to-radiator cooler line connection. It restores a secure, leak-resistant connection where the original fitting has worn, cracked, or corroded.

Built for 2004-2005 Chevrolet Express 1500, Chevrolet Express 2500, GMC Savana 1500, and GMC Savana 2500 applications with the listed cooling setup, this connector matches the original fit and function for service work on the transmission oil cooler line to radiator connection.

Key Features

• Steel construction for durability in transmission cooling system service
• Straight fitting design for a direct connection path
• Quick disconnect end on one side for OE-style line attachment
• Male thread end on the other side for secure mating
• 0.75 in. fitting size on both ends
• Matches the fit and function of the original connector
• Dorman 800-5604 for targeted replacement service

Detailed Description

This automatic transmission oil cooler line connector is engineered to restore the connection between the transmission and the oil cooler after the original part fails. The steel body helps provide a dependable replacement for the OE connector, while the straight layout and mixed quick-disconnect/male-thread design support the factory-style routing used on the listed Chevrolet Express and GMC Savana vans. Dorman 800-5604 is a practical choice when the original cooler line fitting is damaged, leaking, or no longer sealing properly.

This part cross-references 4225 and 29541729 for the same application.

What It Helps Fix

• Transmission fluid leaks at the cooler line-to-radiator connection
• Loose or damaged quick-disconnect attachment points
• Corrosion or wear at the original cooler line connector
• Poor sealing between the transmission and oil cooler line
• Service issues caused by a failed OE-style fitting

Installation Notes and Tips

Verify the vehicle’s RPO code C42 and the 3/4 in. x 19 mm cooler line connection before installation. Confirm the fitting style, thread engagement, and line routing match the original connector on the vehicle. Thread sealer is not present, so use the correct sealing method specified for the application. For best results, inspect the cooler line, radiator port, and surrounding seals for wear before reassembly.

Quality Assurance

Dorman manufactures this connector from quality materials to match original equipment fit and function for the listed applications. It is intended to restore leak-free performance at the transmission oil cooler line connection on compatible Chevrolet Express and GMC Savana models.