Motorad 5456-187 Engine Coolant Thermostat

Reliable Engine Coolant Thermostat for Select GM and More

The Motorad UltraStat 5456-187 engine coolant thermostat is designed to maintain optimal engine temperature for a range of vehicles including Buick, Cadillac, Chevrolet, GMC, and more. Engineered with precision, this thermostat ensures efficient coolant flow and temperature regulation at 187 degrees Fahrenheit.

• Sealing flange outside diameter: 2.13 inches for secure fitment
• Includes a rubber gasket/seal for leak prevention
• Jiggle pin weep hole to prevent air lock and ensure proper coolant circulation
• Bypass diameter of 1.46 inches and bypass length of 1.84 inches for controlled coolant flow
• Flange thickness of 0.05 inches for durability and proper sealing
• Temperature rating of 187°F to maintain engine operating temperature
• One rubber seal included for installation

About the Motorad UltraStat Product Line

The UltraStat line by Motorad focuses on delivering thermostats that meet or exceed OEM specifications for temperature control and durability. This product line emphasizes precise temperature regulation and reliable sealing, making it suitable for a variety of GM vehicles and other makes. The 5456-187 thermostat is part of this line, offering consistent performance and compatibility with multiple models.

Detailed Product Description

The Motorad UltraStat 5456-187 engine coolant thermostat is engineered to regulate engine temperature by controlling coolant flow through the engine and radiator. Its 2.13-inch sealing flange diameter ensures a tight fit within the thermostat housing, while the included rubber gasket provides a secure seal to prevent leaks. The jiggle pin weep hole allows trapped air to escape, reducing the risk of overheating and improving coolant circulation. With a bypass diameter of 1.46 inches and a bypass length of 1.84 inches, this thermostat facilitates proper coolant bypass flow, essential for maintaining stable engine temperatures during warm-up and operation. The flange thickness of 0.05 inches adds to the structural integrity of the thermostat, ensuring long-lasting performance at the rated temperature of 187°F.

Compatible Vehicles and Common Applications

• Buick Allure, LaCrosse, and Lucerne models
• Cadillac CTS, Escalade, Escalade ESV, and Escalade EXT
• Chevrolet Avalanche 1500, Camaro, Corvette, Impala, Silverado 1500/2500/3500, Suburban 1500/2500, Tahoe, Trailblazer, and more
• GMC Envoy, Sierra 1500/2500/3500, Yukon, Yukon XL 1500/2500
• Hummer H2, Isuzu Ascender, Pontiac G8, Firebird, Saab 9-7x

Common Issues Addressed by This Thermostat

• Engine overheating due to thermostat failure
• Coolant leaks from worn or damaged seals
• Poor engine warm-up performance
• Air pockets causing coolant circulation problems
• Inconsistent engine temperature regulation

Installation Notes and Tips

This thermostat does not include an installation tool, so ensure you have the proper tools for removal and installation. Before installing, verify the gasket is properly seated to prevent leaks. The jiggle pin weep hole should be oriented correctly to allow air to escape. Always replace the thermostat housing gasket when installing this part. Follow vehicle-specific service manual instructions for torque specifications and installation procedures.

Quality Assurance and Warranty

The Motorad UltraStat 5456-187 thermostat is manufactured to meet OEM standards for fit and function. It includes a high-quality rubber gasket to ensure a reliable seal. While specific warranty details are not provided, Motorad products typically come with a limited warranty against defects in materials and workmanship. Verify warranty terms with the product documentation or supplier.