Motorad 447448 Engine Coolant Thermostat - Cylinder Head

Reliable Engine Coolant Thermostat for Chevrolet and GMC Vehicles

The Motorad Standard 447448 engine coolant thermostat is designed to maintain optimal engine temperature for select Chevrolet, GMC, and Hummer models. Engineered with precision, this thermostat ensures efficient coolant flow and temperature regulation to support engine performance and longevity.

• Sealing flange outside diameter: 2.2 inches
• Height between flanges: 1.42 inches
• Overall height: 2.03 inches
• Start to open temperature: 185°F
• Includes rubber gasket/seal with O-ring seal type
• Features jiggle pin weep hole for pressure relief
• Bypass diameter: 1.18 inches
• Flange thickness: 0.05 inches
• Includes two seals for secure installation

About the Motorad Standard Product Line

The Motorad Standard line offers dependable engine cooling components designed to meet OEM specifications. This product line focuses on delivering consistent performance and fitment for a range of vehicles, including heavy-duty trucks and vans. The Standard 447448 thermostat is part of this line, providing a balance of quality and reliability for engine temperature control.

Detailed Product Description

This Motorad Standard 447448 engine coolant thermostat is engineered to open at 185 degrees Fahrenheit, allowing coolant to circulate through the engine and radiator at the correct temperature. The thermostat features a sealing flange with a 2.2-inch outside diameter and a height of 2.03 inches, ensuring proper fitment within the cooling system. The included rubber gasket with an O-ring seal type and two seals help prevent leaks and maintain system integrity. Additionally, the jiggle pin weep hole allows trapped air to escape, reducing the risk of overheating and improving coolant flow efficiency.

Compatible Vehicles and Common Applications

• Chevrolet Express 2500 and 3500
• GMC Savana 2500 and 3500
• GMC Sierra 2500 HD, 2500 HD Classic, 3500, 3500 Classic, and 3500 HD
• Chevrolet Silverado 2500 HD, 2500 HD Classic, 3500, 3500 Classic, and 3500 HD
• Hummer H1

This thermostat is designed to regulate engine temperature and prevent overheating, which can cause engine damage, poor fuel economy, and increased emissions.

Common Issues Addressed by This Thermostat

• Engine overheating due to stuck closed thermostat
• Poor heater performance from improper coolant flow
• Coolant leaks caused by worn or damaged seals
• Engine running too cool, affecting fuel efficiency
• Air trapped in cooling system causing hot spots

Installation Notes and Tips

Before installation, ensure the engine is cool and the cooling system is depressurized. Replace the old thermostat and gasket with the Motorad Standard 447448 unit, making sure the jiggle pin is positioned correctly to allow air to escape. Use the included rubber seals to prevent leaks and verify proper flange alignment. No special installation tools are required, but follow vehicle-specific service manual instructions for torque specifications and procedures.

Quality Assurance and Warranty

The Motorad Standard 447448 thermostat is manufactured to meet or exceed OEM standards for durability and performance. It includes two rubber seals and an O-ring to ensure a secure, leak-free fit. While specific warranty details are not provided, Motorad products typically undergo rigorous quality control to ensure reliability in demanding automotive applications.