Original BMW Trans Cooler Return Line – 3 Series

Replace the factory trans cooler return line on BMW 3 Series from 1999–2006 with this Original BMW part. It returns cooled transmission fluid from the cooler to the transmission. The supported range includes 323Ci, 323i, 325Ci, 325i, 328Ci, and 328i, plus additional listed variants. As an Original BMW component, it is produced within BMW’s own vehicle-specific design and testing program.

Technical Details

• Component: Trans Cooler Return Line
• Manufacturer part number: 17-22-7-577-623
• Primary function: returns cooled transmission fluid from the cooler to the transmission
• Vehicle applications: BMW 3 Series
• Production range: 1999–2006
• Manufacturer: BMW
• Listed models: 323Ci, 323i, 325Ci, 325i, 328Ci, and 328i, plus additional listed variants

Fitment & Compatibility

Check the fitment table below against the vehicle’s model, production year, and submodel. Verify transmission type, drivetrain, linkage configuration, and production range. PMB Performance has worked with European vehicle parts and fitment for more than 20 years; contact us with the VIN when the application is uncertain.