Dorman 800-603 Automatic Transmission Oil Cooler Line Connector

Automatic Transmission Oil Cooler Line Connector

The Dorman 800-603 automatic transmission oil cooler line connector restores the connection between the transmission and the oil cooler with a steel, straight-body design. It matches the fit and function of a damaged original equipment connector to help return the cooling circuit to leak-free operation.

• Steel construction for durable service in transmission cooling applications
• Straight SAE connector with quick disconnect and male threaded ends
• Metric threaded end 2 with hex shape for service access
• Direct replacement for select GM trucks, vans, and SUVs
• OE-style fit for transmission oil cooler line repair

Fitment and Application Details

Compatible With select Chevrolet and GMC applications, including Fits 1996-2002 Chevrolet Express 1500, N/A; Fits 1996-2002 Chevrolet Express 2500, N/A; Fits 1996-2002 Chevrolet Express 3500, N/A; Fits 1996-2002 GMC Savana 1500, N/A; Fits 1996-2002 GMC Savana 2500, N/A; and Fits 1996-2002 GMC Savana 3500, N/A. This Dorman 800-603 connector also covers many 1990s and early 2000s Chevrolet Tahoe, GMC Yukon, C/K-series, Suburban, and P-series applications with the listed cooler-line configurations.

This part cross-references Dorman OE Solutions 905-202 for the same application.

What It Helps Fix

• Transmission oil cooler line leaks at the connector
• Damaged or worn quick-disconnect fittings
• Threaded connection issues between the line and engine block or cooler circuit
• Loss of transmission fluid from a compromised cooler line joint
• Poor sealing caused by a failed original connector

Installation Notes and Tips

Verify the line style, thread size, and vehicle-specific notes before installation. This connector uses a straight fitting layout with a quick disconnect on one end and a male threaded connection on the other, so matching the original routing and end types is important. No mounting hardware is included, and no thread sealer is present.

Quality Assurance

Dorman manufactures this connector from quality materials to match original equipment fit and function. The steel construction and OE-style design support a reliable repair for transmission oil cooler line service on select Chevrolet Express, GMC Savana, and related GM applications.