Motorad 951-180 Engine Coolant Thermostat Housing Assembly

Integrated Thermostat Housing for Honda and Acura

The Motorad 951-180 integrated housing thermostat is an OE-style engine coolant thermostat housing assembly built for select Honda and Acura applications. It combines the thermostat, housing, and seal in one service part for a direct replacement on vehicles such as the Honda Pilot, Odyssey, Passport, Ridgeline, and Acura MDX.

Motorad’s Integrated Housing Thermostat line focuses on OE specifications and materials for consistent coolant temperature control. The 180°F thermostat uses a copper case and wax compound for quick reaction to coolant temperature changes, helping maintain stable engine operating temperature in demanding cooling systems.

Key Features

• Part number: 951-180
• Integrated engine coolant thermostat housing assembly
• 180°F thermostat rating
• Material construction: plastic, steel, and copper
• Black housing finish
• Gasket/seal included with O-ring style seal
• Rubber gasket/seal material
• Bleeder hole included for service bleeding
• 3 bolt holes and 2 outlet ports
• Bypass diameter: 1.10 in; bypass length: 1.85 in
• Outlet diameters: 0.55 in and 1.26 in

Detailed Description

Motorad 951-180 is built as an integrated thermostat housing assembly for cooling system service on 2022-2025 Acura MDX and 2022-2025 Honda Odyssey, Passport, Pilot, and Ridgeline, plus earlier 2016-2021 Honda Pilot, 2018-2021 Honda Odyssey, 2018-2021 Honda Ridgeline, and 2019-2021 Honda Passport applications. This part cross-references Dorman - OE Solutions 902-5836 for the same application. The OE-supplier manufacturing approach, copper thermostat case, and wax compound are used to support responsive coolant flow control and consistent operating temperature.

Common Cooling System Issues Addressed

• Engine running too cool or too hot due to thermostat wear
• Coolant leaks at the thermostat housing or seal area
• Temperature fluctuation from a sticking thermostat
• Service issues caused by a damaged or aging integrated housing
• Bleeding concerns after cooling system repair

Installation Notes and Tips

Verify engine fitment by year, make, and model before installation. Inspect the mating surfaces, replace worn coolant as needed, and confirm the O-ring seal seats correctly during assembly. Because mounting hardware and installation tools are not listed as included, reuse or source the required service hardware separately if needed. After installation, bleed the cooling system according to the vehicle service procedure and check for leaks at the housing and outlet connections.

Quality Assurance

Motorad manufactures this thermostat housing assembly with OEM-quality materials and OE-supplier processes to meet factory-style cooling system requirements. The integrated design, 180°F calibration, and OE-spec construction are intended to support reliable temperature regulation in Honda and Acura cooling systems.