Motorad 447448 Engine Coolant Thermostat - Cylinder Head

OE-Style Engine Coolant Thermostat

Motorad 447448 is a standard engine coolant thermostat built for OE-specified temperature control in demanding cooling systems. It uses OEM-quality materials and manufacturing processes, with a copper case and wax compound for quick response to coolant temperature changes.

Compatible With Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, GMC Sierra 3500 HD, and related heavy-duty applications, this thermostat is built for cylinder head mounting locations and direct-fit service.

Key Features

• Start-to-open temperature: 185°F, with temperature range references of 180°F and 185°F
• Standard thermostat design for OE-style cooling system service
• Copper case and wax compound for responsive temperature regulation
• Offset design with air relief valve
• OEM-style seals included where applicable
• Gasket/seal included with rubber O-ring sealing
• Jiggle pin weep hole for air bleeding during service
• Fits cylinder head applications on select Chevrolet, GMC, and Hummer models

Detailed Description

Motorad Standard 447448 is engineered as an OE supplier thermostat for vehicles that rely on stable coolant control under load. The copper case and wax element are designed to react quickly as coolant temperature changes, helping maintain proper operating temperature in heavy-duty cooling systems. The offset design and air relief valve support consistent coolant flow and easier air management after service. This part cross-references Walker Exhaust 54748 for the same application.

For fitment-based searches, this part is commonly selected for Chevrolet Silverado 2500 HD thermostat replacement, GMC Sierra 3500 HD engine coolant thermostat service, and other cylinder head-mounted OE-spec applications. Motorad 447448 is also a relevant search match for Silverado 3500 HD and Sierra 2500 HD cooling system maintenance.

What It Helps Address

• Engine running too cool or too hot due to thermostat wear
• Delayed coolant temperature regulation after startup
• Cooling system temperature instability under towing or heavy load
• Air trapped in the cooling system after thermostat service
• OE-spec thermostat replacement needs on cylinder head applications

Installation Notes and Tips

Install Motorad 447448 at the cylinder head location specified for the vehicle application. Verify the housing surface is clean and free of old seal material before installation. Use the included seal as specified, and confirm the thermostat orientation matches the offset design and air relief valve position. Always refill and bleed the cooling system according to the vehicle service procedure to remove trapped air.

Compatible With 2021-2024 Chevrolet Silverado 2500 HD, Cylinder Head; 2021-2023 Chevrolet Silverado 3500 HD, Cylinder Head; 2022-2024 GMC Sierra 2500 HD, Cylinder Head; and 2021-2024 GMC Sierra 3500 HD, Cylinder Head. Additional coverage includes select 2001-2020 Silverado 2500 HD, 2001-2015 Sierra 2500 HD, 2001-2006 Silverado 3500, 2001-2006 Sierra 3500, 2006-2016 Express 2500/3500, 2006-2016 Savana 2500/3500, and 2006 Hummer H1 applications.

Quality Assurance

Manufactured to OEM specifications and processes by an OE supplier, Motorad 447448 is built with OEM-quality materials and safety standards for service in demanding automotive cooling systems.