Motorad 946-189 Engine Coolant Thermostat Housing Assembly

Integrated thermostat housing for OE cooling control

The Motorad 946-189 integrated housing thermostat is built for precise coolant temperature control in demanding cooling systems. It combines the thermostat and housing in one OE-style assembly for select Audi applications, including Audi S4, Audi A6 Quattro, Audi RS4, and Audi Allroad Quattro.

Motorad’s Integrated Housing Thermostat line focuses on OE-spec fit and temperature response, using OEM-quality materials and manufacturing processes. This 189 degree thermostat uses a copper case and wax compound for quick reaction to coolant temperature changes.

Key features

• OE supplier construction with OEM quality materials and safety standards
• Integrated thermostat and housing design
• Opening temperature: 189 Deg. F
• Bleeder hole and jiggle pin included for air purge during service
• Aluminum, stainless steel, and copper construction
• 4 bolt holes and 2 outlet ports
• Outlet diameters: 0.79 in and 1.50 in
• Silver finish

Detailed product description

The Motorad Integrated Housing Thermostat 946-189 is an OE-style engine coolant thermostat housing assembly engineered for accurate temperature regulation and reliable sealing performance in compatible Audi cooling systems. The 189F calibration matches OE-specified operating temperature requirements for applications such as 2004-2009 Audi S4, 2005-2008 Audi A6 Quattro, 2007-2008 Audi RS4, and 2003-2005 Audi Allroad Quattro. This part cross-references Genuine 079121113F for the same application.

As part of Motorad’s Integrated Housing Thermostat product line, this assembly is manufactured to OE specifications and processes to help maintain stable coolant flow and proper engine operating temperature. The copper case and wax compound are selected for fast response as coolant temperature changes, while the bleeder hole and jiggle pin support air removal during service.

Common issues this part addresses

• Engine running too cool or too hot due to thermostat control problems
• Coolant temperature fluctuations during driving or idle
• Housing wear or sealing concerns at the thermostat assembly
• Delayed warm-up from a thermostat that no longer opens at the correct temperature
• Air trapped in the cooling system after thermostat service

Installation notes and tips

Verify the 189 Deg. F temperature rating and match the vehicle application before installation. This assembly does not include bolts, gasket or seal, hardware, or mounting hardware, so reuse or replace related service parts as needed. Clean the mating surfaces thoroughly and follow the vehicle service procedure for coolant refill and air bleeding.

Compatible With 2004-2009 Audi S4, 2005-2008 Audi A6 Quattro, 2007-2008 Audi RS4, and 2003-2005 Audi Allroad Quattro. Use part number 946-189 when confirming fitment for Audi cooling system service.

Quality assurance

Motorad manufactures this thermostat housing assembly with OEM-quality materials and OE-supplier standards to meet the demands of modern automotive cooling systems. The 946-189 is built to OE specifications for consistent temperature control and service fit.