Dorman 667-645 Turbocharger Coolant Line - Return

Turbocharger Coolant Line for OE Fit

Dorman 667-645 is a turbocharger coolant line built to match the fit and function of the original line on specified vehicles. It uses carbon steel construction and molded-assembly shaping to support reliable coolant routing in turbocharged applications. This OE-style replacement is a direct option for Buick Regal and Buick Verano models with return-line fitment.

Key Features

• OE-style turbocharger coolant line for specified applications
• Carbon steel construction with silver finish
• Molded assembly shape for factory-style routing
• Threaded hollow bolt inlet and outlet fittings
• 14 mm threaded fitting diameter at both ends
• Centerline length: 285 mm
• Inside diameter: 7.5 mm; outside diameter: 9.5 mm
• Fits return position applications on Buick Regal and Buick Verano

Detailed Description

This Dorman turbocharger coolant line, part number 667-645, is engineered as an OE replacement for vehicles that use a return-position turbo coolant line. The carbon steel tube and molded assembly design help maintain the original routing and connection points, while the threaded hollow bolt fittings support a factory-style installation layout. It is a direct-fit solution for 2011-2013 Buick Regal, Return, and 2013-2016 Buick Verano, Return. This part cross-references GM OE 12626640 for the same application.

Common Problems It Can Address

• Coolant leakage at the turbocharger line connections
• Corrosion or fatigue in the original coolant line
• Improper routing caused by a damaged or bent line
• Loss of coolant flow through a restricted return line
• Fitment issues from using a non-OE-style replacement

Installation Notes and Tips

Verify the vehicle’s turbocharger coolant line position before installation. This part is specified for return applications only, so confirm the original line routing, fitting style, and 14 mm threaded connection points match the vehicle. Inspect adjoining seals, bolts, and mating surfaces for wear or contamination before assembly. For best results, compare the removed line to Dorman 667-645 before final installation on Buick Regal or Buick Verano applications.

Quality Assurance

Dorman designs this coolant line to match original fit and function using quality materials for durability and dependable performance. The OEM-grade construction supports a factory-style repair on 2011-2013 Buick Regal and 2013-2016 Buick Verano turbocharger return-line applications.