Gates CO35043 Engine Coolant Thermostat Housing

Gates Coolant Outlet for Volkswagen and Audi

The Gates Coolant Outlet CO35043 is an engine coolant thermostat housing built for select Volkswagen and Audi applications. It is made from plastic and includes two integrated seals for a direct-fit cooling system repair on vehicles such as the Volkswagen Jetta, Volkswagen Golf, Golf SportWagen, Audi A3 Sportback e-tron, and Audi Q3.

Gates Coolant Outlet line products are engineered as OE-style replacements that address common material and design issues seen in many aftermarket cooling parts. The CO35043 is designed to match original fit and function while supporting long service life in the cooling system.

Key Features

• Engine coolant thermostat housing for cooling system service
• Plastic construction for OE-style fitment
• Includes two integrated seals
• Five bolt holes for secure mounting
• Outlet diameters: 0.77 in. and 1.25 in.
• Outlet inside diameters: 0.6 in. and 1.05 in.
• Direct replacement for OE part number 04E121116C
• Gates CO35043 coolant outlet for Volkswagen Jetta and Golf applications

Detailed Description

The Gates CO35043 thermostat housing is a coolant outlet assembly designed for vehicles that require a precise cooling system connection and stable thermostat housing performance. This part cross-references OE number 04E121116C for the same application. It is a practical replacement choice for drivers servicing a Volkswagen Jetta, Volkswagen Golf, Golf SportWagen, Audi A3 Sportback e-tron, or Audi Q3 cooling system.

As part of the Gates Coolant Outlet program, this housing is built to provide a cost-effective alternative to common aftermarket failures caused by poor material selection or inconsistent design. The CO35043 supports proper coolant routing and sealing at the thermostat housing interface.

Common Repair Uses

• Coolant leaks at the thermostat housing
• Cracked or warped plastic outlet housing
• Failed integrated seals at the coolant outlet
• Cooling system service on a Volkswagen Jetta or Golf
• Replacement of a worn OE-style coolant outlet assembly

Installation Notes and Tips

Verify OE number 04E121116C and compare the outlet diameters, bolt hole count, and housing style before installation. Inspect mating surfaces for residue or damage, and confirm the cooling system is properly bled after service. This part is listed for 2014-2021 Volkswagen Jetta, 2019-2021 Volkswagen Golf, 2019 Volkswagen Golf SportWagen, 2016-2018 Audi A3 Sportback e-tron, and 2016 Audi Q3.

Quality Assurance

Gates designs the Coolant Outlet line to fit and perform like the original component while addressing common aftermarket material and manufacturing concerns. The CO35043 is built for dependable cooling system service in confirmed Volkswagen and Audi applications.