Motorad 758-185 Engine Coolant Thermostat Housing Assembly

Integrated Thermostat Housing for OE Cooling Control

The Motorad 758-185 integrated housing thermostat is built for vehicles that use a combined thermostat, housing, and seal assembly. With a 185 Deg. F opening temperature, it supports stable coolant regulation for Audi, Porsche, and Volkswagen applications that require OE-style temperature control.

Motorad’s Integrated Housing Thermostat line focuses on direct-fit cooling system service parts with the thermostat and housing engineered as a matched assembly. This helps simplify replacement on vehicles such as the Audi A4, Audi Q5, Porsche Cayenne, and Volkswagen Touareg where the factory design uses an integrated unit.

Key Features

• Part number 758-185 integrated thermostat housing assembly
• 185 Deg. F start-to-open temperature for OE-specified cooling control
• Includes thermostat, housing, and rubber seal
• Constructed from plastic, stainless steel, and copper materials
• 7 bolt holes and 1 outlet port
• 1.36 in outlet diameter
• Black housing finish
• Manufactured to OEM specifications and processes
• Copper case and wax compound for quick response to coolant temperature changes

Detailed Description

The Motorad 758-185 is an engine coolant thermostat housing assembly designed for direct replacement in OE-style cooling systems. Its integrated design combines the thermostat and housing into one service part, helping restore proper coolant flow control in applications that call for a 185 Deg. F thermostat. This part cross-references Dorman OE Solutions 902-5218 and Stant 49688 for the same application.

Compatible With 2011-2019 Porsche Cayenne, 2013-2017 Audi Q5, 2012-2017 Audi S5, 2014-2017 Audi SQ5, 2014-2017 Volkswagen Touareg, 2015-2016 Audi A5, 2013-2016 Audi S4, 2015-2016 Porsche Panamera, 2012-2013 Porsche Panamera, 2015 Audi A4, 2013 Audi A4, 2009-2015 Audi A6 Quattro, 2012-2015 Audi A7 Quattro, 2011-2015 Audi Q7, 2013-2014 Audi A4 Quattro, 2012-2014 Audi A5 Quattro, 2012-2014 Audi A8 Quattro, 2014 Porsche Panamera, and 2010-2012 Audi S4.

Common Cooling System Issues It Can Address

• Engine running too cool or too warm due to thermostat wear
• Coolant temperature fluctuation from a sticking thermostat
• Leaks at the thermostat housing or seal interface
• Service issues on integrated thermostat housing designs
• Cooling system performance concerns tied to an aging OE assembly

Installation Notes and Tips

• Verify the 185 Deg. F temperature specification before installation.
• Inspect the mating surfaces and replace any damaged coolant hoses or connectors during service.
• Use the included rubber seal and confirm proper seating before refilling the cooling system.
• Bleeding the cooling system after installation helps remove trapped air and restore normal circulation.
• Confirm vehicle-specific fitment by year, make, and model before ordering.

Quality Assurance

Motorad manufactures this thermostat housing assembly with OEM-quality materials and safety standards as an OE supplier. The copper case and wax compound are selected to respond quickly to coolant temperature changes, and the part is produced to OEM specifications and processes for consistent cooling system service.