Dorman Transmission Oil Cooler Lines
Transmission lines leaking? Fix them right for less.
Dorman Transmission Oil Cooler Lines
Dorman offers hundreds of transmission oil cooler lines to help repair leaking, rusted or clogged lines and keep transmissions running properly. Our corrosion-resistant lines pass a dozen different validation checkpoints and seamlessly replace the most current OE cooler line features, such as barbed hose crimp connectors and thermostatic bypass valves. Get the original fit and performance your transmission requires - without the original equipment costs.
Covering 2/3 of US Vehicles
Features and Benefits
Aftermarket firsts
Dorman regularly releases exclusive solutions for a wide range of vehicles
Rigorously tested
120-hour salt spray-tests and twelve validation checkpoints ensure corrosion-resistance and long-term reliability
Latest OEM technology
Dorman reverse-engineers the newest OE cooler lines to include the most current factory features
Durable designs
Fix it right with a longer-lasting repair with Dorman solutions featuring upgraded plated-steel hoses and barbed hose crimp designs that resist separation under pressure
Built to last
Backed by a limited lifetime warranty
More Durable Materials for Better Performance
Transmission oil cooler lines fail from corrosion and separation at connection points, especially in regions where lines are exposed to harsh elements. Dorman transmission cooler lines feature premium materials to provide better and longer-lasting protection for transmissions.
Aftermarket-First OE Technology
Dorman lines for specified vehicles include thermostatic bypass valves, the newest technology that optimizes flow and operating temperature of transmission fluid.
Barbed Hose Crimp Connections
Our cooler lines use more secure connection designs to resist hose separation and leaks, and help prevent transmission overheating and damage.
Performance-Tested
All Dorman transmission oil cooler line designs are fit- and function-tested in a 12-step testing process, and must pass a grueling 120-hour salt spray test to prove corrosion resistance of the lines’ zinc and clear chromate coating.