Hold your Audi's V8 at its proper operating temperature with the Motorad engine coolant thermostat, an integrated housing assembly (P/N 946-189). It installs as a direct-fit replacement for the 2003-2005 Audi Allroad Quattro, 2004-2009 Audi S4, 2005-2008 Audi A6 Quattro, and 2007-2008 Audi RS4, all with the V8-4.2L.
- Multi-metal construction: built from stainless steel, aluminum, and copper for durability under demanding cooling-system conditions.
- Rapid response: a copper case and wax compound react quickly to coolant temperature changes, opening at approximately 189°F (87°C).
- Integrated housing: features four mounting holes, two outlet ports (0.81 in / 20.57 mm and 1.5 in / 38.1 mm), and a bleeder hole.
- Ready to install: 100% tested and calibrated, with a mechanical disk valve for consistent, precise operation.
This Motorad thermostat housing regulates coolant flow: it stays closed during warm-up, then opens as coolant reaches its rated temperature to circulate flow to the radiator and hold a steady operating temperature. If a stuck thermostat is behind engine overheating, a too-cold running temperature, gauge fluctuations, or weak heat output, this assembly replaces it. A gasket or seal is required but not included, and mounting hardware is not included — source both separately. Country of origin: China.
Interchange: 079 121 111 F · HT189-469 · 902-5162
079121111F · HT189469 · 9025162 · 079121111J · 94689 · P94689 · 50349 · 079121113F
This part cross-references / interchanges with the following part numbers:
079 121 111 F, 079121111J, HT189-469, 94689, 902-5162, 946-189, 59458, P94689, 50349, 079121113F, 9946189
