Gates CO34945 Engine Coolant Filler Neck

Gates Coolant Outlet for Mini Cooper

The Gates Coolant Outlet CO34945 is an engine coolant filler neck built for 2002-2006 Mini Cooper models. It is a plastic coolant outlet assembly with a 3-bolt design, integrated bypass passages, and OE-style fitment for the cooling system service needs of this application.

Gates Coolant Outlet line components are engineered to address common material and design issues seen in many aftermarket cooling parts. The Coolant Outlet program covers water outlets through thermostat housing assemblies, giving technicians a direct replacement option for cooling system repairs on the Mini Cooper.

Key Features

• Part number CO34945
• Engine coolant filler neck / coolant outlet assembly
• Plastic construction
• 3 bolt holes for mounting
• By-pass holes included
• Outlet dimensions: 1.25 in and 0.41 in outside diameter; 1.01 in and 0.29 in inside diameter
• Includes a 16 psi radiator cap and 196 degree F thermostat with integrated seal
• OE-style fit and performance target

Detailed Description

Gates CO34945 is a coolant filler neck designed for the cooling system on 2002-2006 Mini Cooper models. It is built to match the original layout with the correct outlet sizing, bypass features, and 3-bolt mounting pattern. The plastic construction supports a direct replacement approach for service work where the original coolant outlet has aged, cracked, or begun to leak. This part cross-references Dorman OE Solutions 902-5113 for the same application.

As part of the Gates Coolant Outlet line, CO34945 is intended to provide a practical replacement for common coolant outlet and thermostat housing service needs. It is a strong match for Mini Cooper coolant outlet replacement searches, Mini Cooper coolant filler neck replacement, and 2002-2006 Mini Cooper thermostat housing service.

Common Problems It Can Help Solve

• Coolant leaks at the filler neck or outlet housing
• Cracked or brittle plastic coolant outlet components
• Improper sealing at the thermostat housing interface
• By-pass passage wear or mismatch during cooling system repair
• Cooling system service issues on 2002-2006 Mini Cooper models

Installation Notes and Tips

Verify the outlet diameter, bolt-hole count, and bypass configuration against the original part before installation. Inspect the mating surfaces, hoses, and seals for wear or contamination, and confirm the thermostat and cap specifications match the vehicle’s cooling system requirements. For best results, bleed the cooling system carefully after service to remove trapped air.

Quality Assurance

Gates designs its Coolant Outlet line to address common aftermarket fit and material concerns while maintaining OE-style function and long service life. CO34945 is built for direct replacement use on the listed Mini Cooper applications.