Motorad 5456-187 Engine Coolant Thermostat

Motorad UltraStat 5456-187 Thermostat Overview

Motorad UltraStat 5456-187 is an engine coolant thermostat built for OE-spec temperature control at 187°F. It is a direct replacement thermostat for a wide range of GM trucks, SUVs, and performance cars, including Chevrolet Silverado, Tahoe, Corvette, and GMC Sierra applications.

The UltraStat line focuses on durable stainless steel construction and controlled coolant flow. This thermostat includes a rubber seal and a jiggle pin weep hole for service-friendly installation and air bleeding during cooling system maintenance.

Key Features

• 187°F engine coolant thermostat for OE-specified operating temperature
• Heavy-gauge stainless steel construction for corrosion resistance and long service life
• BLVT valve technology helps reduce thermal shock to cooling system components
• Includes rubber gasket/seal for a proper housing seal
• Jiggle pin weep hole supports air purging during fill and service
• Bypass dimensions: 1.46 in diameter and 1.84 in length
• Sealing flange outside diameter: 2.13 in; flange thickness: 0.05 in

Detailed Description

Motorad UltraStat 5456-187 is an engine coolant thermostat designed for vehicles that require a 187°F opening temperature and a thermostat-only replacement. The stainless steel construction resists corrosion, while the valve design helps regulate coolant flow more smoothly as the engine reaches operating temperature. This supports stable warm-up behavior in GM cooling systems and helps maintain the factory temperature strategy.

This part cross-references 95456187 and MU545687 for the same application. It is a strong match for drivers searching for a 187 degree thermostat for Chevrolet Silverado 1500, GMC Sierra 1500, or Cadillac Escalade cooling system service. The Motorad 5456-187 also serves many Corvette, Tahoe, and Yukon applications listed in the fitment data.

What It Helps Address

• Engine running too cool or taking too long to reach operating temperature
• Temperature fluctuation caused by a worn thermostat
• Coolant flow control issues after thermostat housing service
• Corrosion-related thermostat failure in the cooling system
• Air trapped in the cooling system during refill or maintenance

Installation Notes and Tips

Install this thermostat only on the vehicles and model years listed in the fitment data. The gasket/seal is included, and the part is specified as thermostat-only replacement in many applications. Clean the housing sealing surface before installation, verify the bypass dimensions match the original setup, and follow the vehicle service procedure for coolant refill and air bleeding. The jiggle pin should be oriented according to the factory service method when applicable.

Compatible With 2004-2006 Chevrolet Silverado 1500, N/A; 2002-2006 GMC Sierra 1500, N/A; 2004-2006 Cadillac Escalade, N/A; 2004-2008 Chevrolet Corvette, N/A; and other listed GM applications. For buyers searching by part number, Motorad 5456-187 is the UltraStat thermostat used across multiple GM cooling system configurations.

Quality Assurance

UltraStat thermostats are built with stainless steel construction for corrosion resistance and consistent operation. Motorad’s BLVT valve technology is used to help moderate thermal shock in the cooling system, supporting controlled temperature regulation in demanding daily-driver and truck applications.