Motorad 860-203 Engine Coolant Thermostat Housing Assembly

Integrated Housing Thermostat for GM Cooling Systems

Motorad 860-203 is an engine coolant thermostat housing assembly built to OE specifications for vehicles that use an integrated housing design. It combines a mechanical disk-style thermostat with an aluminum, stainless steel, and copper housing to help maintain stable coolant flow and operating temperature.

Compatible With Cadillac XT6, Cadillac XT5, Chevrolet Blazer, GMC Acadia, Buick Regal Sportback, and Buick LaCrosse applications that call for this integrated housing thermostat design. The Motorad Integrated Housing Thermostat line focuses on OE-style fit, correct sealing, and temperature response for modern cooling systems.

Key Features

• Engine coolant thermostat housing assembly with integrated housing design
• OE supplier manufacturing standards and OEM specifications
• Copper case and wax compound for quick response to coolant temperature changes
• Mechanical disk valve type with bleeder hole and jiggle pin included
• Offset design with air relief valve and OEM-style seals where applicable
• Aluminum, stainless steel, and copper construction
• Gasket or seal included and pre-installed rubber O-ring seal
• Mounting hardware included

Product Details

Motorad part number 860-203 is a standard replacement thermostat housing assembly engineered for direct service on select GM vehicles. It opens at 203°F (95°C) and uses an integrated housing layout with a 1.23 in. inside diameter, 1.36-1.38 in. outlet port outside diameter, and two mounting holes. The housing is finished in silver and built to support consistent coolant regulation in demanding automotive cooling systems.

This part cross-references Genuine 12623519 for the same application.

Common Cooling System Issues It Can Address

• Engine running hotter than normal due to thermostat sticking
• Slow warm-up or unstable operating temperature
• Coolant seepage at the thermostat housing seal surface
• Temperature fluctuation caused by worn internal thermostat components
• Service replacement for a damaged integrated housing assembly

Installation Notes

Verify the OE-style integrated housing layout, outlet size, and mounting-hole spacing before installation. Replace the thermostat housing assembly only after the cooling system has cooled completely, and inspect the mating surfaces, hoses, and coolant condition during service. Use the included seal and hardware as specified for the application, and follow the vehicle manufacturer’s bleed procedure to remove trapped air.

Quality Assurance

Motorad manufactures this thermostat housing assembly using OEM-quality materials and OE-supplier processes to meet standard replacement requirements. The copper case and wax compound are selected for responsive temperature control, and the design includes OE-style sealing features for service fitment.

Fits 2020-2025 Cadillac XT6, N/A. Fits 2017-2024 Cadillac XT5, N/A. Fits 2019-2025 Chevrolet Blazer, N/A. Fits 2017-2023 GMC Acadia, N/A. Fits 2018-2020 Buick Regal Sportback, N/A. Fits 2017-2019 Buick LaCrosse, N/A.