Vemo V15-99-0004 Engine Coolant Thermostat Housing

Engine Coolant Thermostat Housing for Audi and Volkswagen

The Vemo V15-99-0004 is an engine coolant thermostat housing made from plastic for select Audi and Volkswagen applications. It is listed without thermostat and matches OE reference 078121121K for direct replacement use on covered vehicles.

Key Features

• Engine coolant thermostat housing for the cooling system
• Plastic construction
• Listed without thermostat
• Dimensions: 319 mm length, 117 mm width, 89 mm height
• Lightweight design at 0.255 kg
• VEMO product line identification: VEMO
• Cross-reference OE number: 078121121K

Detailed Description

Vemo V15-99-0004 is an aftermarket engine coolant thermostat housing for select Audi A6, Audi A6 Quattro, Audi Allroad Quattro, and Volkswagen Passat models. This housing is built from plastic and follows the OE reference 078121121K, making it a direct-match replacement for vehicles listed in the fitment data. The VEMO line focuses on application-specific cooling system components, and this part is cataloged for 2001-2005 Audi Allroad Quattro, 2001-2004 Audi A6 and A6 Quattro, and 2002-2005 Volkswagen Passat coverage.

This part cross-references Genuine 078121121K for the same application.

What This Part Helps Address

• Cracked or leaking thermostat housing
• Coolant seepage at the housing assembly
• Improper sealing at the cooling system connection point
• Housing damage from age-related plastic wear
• Cooling system service on OE-number 078121121K applications

Installation Notes and Tips

Verify the OE number and chassis breakpoints before ordering, especially on 2001 Audi A6, 2001 Audi A6 Quattro, and 2001 Volkswagen Passat applications with VIN-specific notes. This housing is listed without thermostat, so confirm whether your repair requires the thermostat to be transferred or sourced separately. Inspect mating surfaces, seals, and coolant condition during installation, and refill and bleed the cooling system according to factory procedure after replacement.

Quality Assurance

Vemo catalogs this thermostat housing as an OE-referenced aftermarket replacement for the specified Audi and Volkswagen fitments. Part number V15-99-0004 is matched to OE number 078121121K for application verification.