Dorman 800-743 Automatic Transmission Oil Cooler Line Connector

Automatic Transmission Oil Cooler Line Connector

Dorman 800-743 is an automatic transmission oil cooler line connector built from steel for a direct-fit repair at the transmission-to-radiator cooler connection. It restores the line connection point on select Chevrolet Express and GMC Savana vans when the original connector is damaged or leaking.

Key Features

• Steel construction for a durable replacement connection
• Straight fitting design
• Quick disconnect end on one side for OE-style line attachment
• Male thread end on the other side for secure cooler connection
• 0.75 in. fitting size at both ends
• Matches fit and function of the original connector for leak-free performance

Detailed Description

This Dorman transmission oil cooler line connector is engineered to restore the connection between the automatic transmission and the oil cooler on 2004-2005 Chevrolet Express 1500, 2004-2005 Chevrolet Express 2500, 2004-2005 GMC Savana 1500, and 2004-2005 GMC Savana 2500 models with the listed configuration. The steel body and straight layout support a secure replacement for the original equipment connector, helping maintain proper fluid routing through the cooler circuit. Dorman 800-743 is a practical repair choice when the factory connector is cracked, corroded, or no longer sealing correctly.

This part cross-references Monroe Shocks & Struts (e.g., 4225, 29541729) for the same application.

What It Helps Fix

• Transmission fluid seepage at the cooler line connection
• Damaged or worn quick-disconnect fitting at the radiator side
• Loose or unreliable cooler line attachment
• Corrosion-related failure at the transmission oil cooler connector
• Loss of proper fluid transfer between the transmission and cooler

Installation Notes and Tips

Verify the vehicle’s RPO code C42 and the 3/4 in. x 19 mm connection details before installation. Confirm the existing line end type and thread engagement match the connector design. Clean the mating surfaces and inspect the cooler line and radiator port for wear or damage before reassembly.

Quality Assurance

Made from quality materials and built to match the original connector’s fit and function, this part is intended to restore leak-free performance in the transmission cooler line circuit.

• Fits 2004-2005 Chevrolet Express 1500, N/A
• Fits 2004-2005 Chevrolet Express 2500, N/A
• Fits 2004-2005 GMC Savana 1500, N/A
• Fits 2004-2005 GMC Savana 2500, N/A