Motorad 941-203 Engine Coolant Thermostat Housing Assembly

Integrated Thermostat Housing for Audi and Volkswagen

Motorad 941-203 is an integrated engine coolant thermostat housing assembly built for OE-style replacement on select Audi and Volkswagen applications. It combines the thermostat, housing, and seal in one service part to support accurate coolant temperature control in demanding cooling systems.

Fits 2007-2010 Audi A8 Quattro, N/A; Fits 2007-2010 Audi Q7, N/A; Fits 2007-2010 Audi S8, N/A; Fits 2007-2011 Audi S6, N/A; Fits 2009-2011 Audi A6 Quattro, N/A; Fits 2007-2009 Volkswagen Touareg, N/A; Fits 2011-2017 Volkswagen Touareg, N/A.

Key Features

• Integrated housing thermostat assembly for simplified cooling system service
• OE supplier construction using OEM-quality materials and manufacturing processes
• Copper case and wax compound for responsive temperature regulation
• Offset design with air relief valve where applicable
• Plastic, metal, and copper construction with black finish
• Disk valve type with blade terminals and mechanical actuator
• Gasket or seal included and pre-installed with rubber O-ring sealing design
• Start-to-open temperature: 203°F / 95°C

Detailed Description

Motorad Integrated Housing Thermostat 941-203 is a standard replacement engine coolant thermostat housing assembly engineered to meet OEM specifications. The integrated design helps restore proper coolant flow control in Audi A6 Quattro, Audi S6, Audi A8 Quattro, Audi Q7, Audi S8, and Volkswagen Touareg applications. Its copper thermostat case and wax compound are selected for quick reaction to coolant temperature changes, while the housing uses OEM-style sealing features for a precise service fit. This part cross-references 203-149 for the same application.

Common Cooling System Issues Addressed

• Engine running too cool or too warm due to thermostat control problems
• Coolant leaks at the thermostat housing or seal interface
• Temperature fluctuations caused by worn thermostat internals
• Service issues from cracked or aging plastic housing components
• Cooling system warning lights related to thermostat performance

Installation Notes and Tips

Replace the thermostat housing assembly on a cold engine and drain coolant before removal. Inspect the mating surfaces, hoses, and connectors for wear or contamination before installation. Use the correct gasket or seal during service, and follow the vehicle manufacturer’s coolant fill and bleed procedure to remove trapped air.

Quality Assurance

Motorad manufactures this integrated thermostat housing assembly to OEM specifications and safety standards as an OE supplier. The design is built to withstand demanding automotive cooling system conditions while maintaining consistent temperature control.