Dorman 902-5873 Engine Coolant Thermostat Housing Assembly

Dorman 902-5873 Thermostat Housing Assembly

Dorman 902-5873 is an engine coolant thermostat housing assembly built for specified Audi applications. It matches the stock housing’s fit and durability requirements while using a plastic housing with an integrated thermostat, gasket, and sensor connection points for a direct replacement approach.

Compatible with 2008-2012 Audi S5, 2011-2012 Audi A8 Quattro, 2011 Audi RS5, and 2013-2016 Audi RS5, this thermostat housing assembly addresses cooling-system service needs on select Audi models. The Dorman 902-5873 design is made to handle repeated temperature swings in normal engine operation.

Key Features

• Engine coolant thermostat housing assembly for select Audi vehicles
• Plastic housing with black finish
• Thermostat included with 221 degrees F opening temperature
• Gasket included for sealing at installation
• Sensor included in the package contents
• Two outlet ports and three mounting holes
• Direct-fit replacement for the original housing assembly

Detailed Description

This thermostat housing assembly is engineered for OE-style fitment on Audi RS5, Audi A8 Quattro, and Audi S5 applications listed above. The housing is designed around the original mounting layout and flange dimensions, with integrated cover construction that supports proper coolant routing and thermostat control. Dorman 902-5873 also cross-references Motorad 948-221 and OE part number 079121115AA for the same application.

Common Cooling-System Issues It Can Address

• Coolant leaks at the thermostat housing
• Cracked or heat-aged plastic housing surfaces
• Thermostat sticking open or closed
• Temperature control problems that affect engine warm-up
• Fault codes related to coolant temperature or thermostat performance

Installation Notes and Tips

Confirm engine code and vehicle fitment before installation. Inspect the mating surfaces, replace worn seals as needed, and verify that the coolant system is properly bled after service. Because mounting hardware is not included, reuse or source the required fasteners separately if needed for the application.

Quality Assurance

Dorman designs this replacement thermostat housing assembly to match the fit and durability of the original part on specified vehicles and to withstand extreme temperature changes for extended service life.