Gates CO34955 Engine Coolant Filler Neck

Coolant Outlet for Mitsubishi Applications

The Gates Coolant Outlet CO34955 is an engine coolant filler neck built for select Mitsubishi cooling system applications. It is a plastic coolant filler neck with a 16 psi radiator cap and OE-style fitment focus for Mitsubishi Outlander, Outlander Sport, and Lancer models.

Gates Coolant Outlet line parts are engineered to address common material and design issues seen in many aftermarket cooling components. CO34955 is built to match original fit and function while supporting long service life in everyday cooling system use.

Key Features

• Brand: Gates Coolant Outlet
• Part number: CO34955
• Engine coolant filler neck / coolant outlet design
• Plastic construction
• Includes 16 psi radiator cap
• Two-bolt mounting design
• OE-style fit and performance focus
• Cross-reference: 1350A015

Detailed Description

CO34955 is a Gates coolant filler neck assembly designed for Mitsubishi cooling system service where the original coolant outlet has worn, cracked, or no longer seals correctly. The part is listed for 2007-2015 Mitsubishi Outlander, 2014-2019 Mitsubishi Outlander Sport, 2011 Mitsubishi Outlander Sport, 2019 Mitsubishi Outlander, 2020 Mitsubishi Outlander Sport, and 2008-2017 Mitsubishi Lancer. If you are searching for a Mitsubishi Outlander coolant outlet or a Mitsubishi Lancer coolant fill flange replacement, this part number is a direct fitment reference for those applications.

The Gates Coolant Outlet product line covers water outlets through complete thermostat housing assemblies, giving technicians a focused replacement option for cooling system repairs. CO34955 follows that approach with a filler neck assembly built to perform like the original component and support dependable coolant system operation.

What It Helps Fix

• Cracked or brittle coolant filler neck housing
• Leaking coolant outlet at the neck or cap sealing area
• Damaged radiator cap interface on Mitsubishi cooling systems
• Cooling system service issues caused by worn plastic outlet material
• Fitment problems from incorrect aftermarket coolant outlet replacements

Installation Notes

Verify the vehicle application and cooling system configuration before installation. Confirm the 16 psi cap specification, bolt-hole layout, and outlet dimensions against the original part. Inspect the mating surfaces, hoses, and seals during service, and replace any damaged cooling system components as needed to restore proper sealing.

Quality Assurance

Gates positions this coolant outlet program as an OE-style replacement line focused on fit, function, and durability. CO34955 is built to address common aftermarket material and design concerns while maintaining original-equipment-style performance for Mitsubishi cooling system repairs.