Motorad 576-189 Engine Coolant Thermostat Housing Assembly

Integrated Housing Thermostat for Audi Cooling Systems

Motorad 576-189 is an engine coolant thermostat housing assembly built to OE specifications for select Audi applications. It combines the thermostat, housing, and seal in an integrated design for 2005-2010 Audi A4 Quattro and 2005-2008 Audi A4 models with a 189°F opening temperature.

The Motorad Integrated Housing Thermostat line focuses on OE-style fit and cooling-system accuracy. This assembly uses OEM-quality materials and processes, with a copper case and wax compound for quick response to coolant temperature changes. The black plastic housing includes a rubber seal and an offset design with an air relief valve where applicable.

• Part number: 576-189
• Engine coolant thermostat housing assembly with integrated thermostat and housing
• 189°F start-to-open temperature
• Black housing with plastic, stainless steel, and copper construction
• Rubber gasket/seal included
• 2 bolt holes and 3 outlet ports
• OE-style seals and air relief valve design where applicable
• Compatible with 2005-2010 Audi A4 Quattro and 2005-2008 Audi A4

Detailed Product Overview

Motorad 576-189 is engineered for Audi A4 and Audi A4 Quattro cooling-system service where the thermostat and housing are serviced together. The 189°F calibration supports factory-style coolant temperature control, while the integrated housing design helps simplify replacement on applications that use a combined thermostat assembly. This part cross-references Dorman - HELP 57618 and 57689 for the same application.

Common Cooling System Issues Addressed

• Engine running hotter than normal due to a thermostat that no longer opens at the correct temperature
• Coolant leaks at the thermostat housing or seal interface
• Temperature fluctuation caused by worn thermostat internals
• Service issues on Audi A4 and Audi A4 Quattro models that require an integrated housing thermostat
• Fitment concerns when replacing an OE-style 189°F thermostat housing assembly

Installation Notes and Tips

Verify the OE-style 189°F specification before installation and confirm the housing matches the vehicle’s outlet-port and bolt-hole layout. Replace the seal during service, clean the mating surfaces thoroughly, and refill and bleed the cooling system according to factory procedure to reduce trapped air. Confirm fitment for 2005-2010 Audi A4 Quattro and 2005-2008 Audi A4 before ordering.

Quality Assurance

Motorad manufactures this integrated housing thermostat with OEM-quality materials and OE-supplier standards. The design follows OEM specifications and processes for consistent cooling-system performance in Audi A4 and Audi A4 Quattro applications.