Motorad 456-180 Engine Coolant Thermostat

Engine Coolant Thermostat for GM Applications

Motorad 456-180 is a standard engine coolant thermostat built to OE specifications for consistent temperature control in demanding cooling systems. It includes a rubber seal and a jiggle pin weep hole for easier air bleeding during service.

Compatible With a wide range of Chevrolet, GMC, Cadillac, Buick, Pontiac, Saab, Hummer, Isuzu, and Corvette applications, this 180-degree thermostat supports common GM cooling system service needs across 1997-2009 model years.

Key Features

• 180°F thermostat calibration for standard cooling system operation
• OEM-quality materials and manufacturing processes
• Copper case with wax compound for responsive temperature changes
• Rubber gasket/seal included
• Jiggle pin weep hole for air purge during installation
• Sealing flange outside diameter: 2.13 in.
• Bypass diameter: 1.46 in.
• Bypass length: 1.84 in.
• Flange thickness: 0.05 in.

Detailed Description

Motorad Standard 456-180 is an engine coolant thermostat engineered for OE-style fit and function. The copper case and wax compound are used to react quickly to coolant temperature changes, helping the engine reach and maintain the intended operating range. This part cross-references Dorman Autograde 45680 and Four Seasons 55680 for the same application.

Fits 2008-2009 Buick Allure, N/A; Fits 2008-2009 Buick LaCrosse, N/A; Fits 2006-2009 Chevrolet Impala, N/A; Fits 2004-2009 Chevrolet Silverado 2500, N/A; Fits 2008-2009 Pontiac G8, N/A; Fits 2004-2008 Chevrolet Corvette, N/A; Fits 2005-2008 Pontiac Grand Prix, N/A; Fits 2005-2008 Saab 9-7x, N/A; Fits 2004-2007 Cadillac CTS, N/A; Fits 2006-2007 Chevrolet Monte Carlo, N/A; Fits 2004-2006 Chevrolet Silverado 1500, N/A; Fits 2004-2006 GMC Sierra 1500, N/A; Fits 1997-2003 Chevrolet Corvette, N/A; Fits 1998-2002 Pontiac Firebird, N/A.

Common Service Uses

• Engine running too cool or taking too long to warm up
• Temperature fluctuation during stop-and-go driving
• Cooling system service after thermostat housing work
• Replacement for a worn thermostat seal or leaking thermostat assembly
• Restoring proper coolant flow control in GM V8 applications

Installation Notes and Tips

Verify the 180°F temperature rating and match the thermostat dimensions to the original part before installation. The included rubber seal should be seated cleanly, and the jiggle pin weep hole should be positioned to help trapped air escape during refill. Inspect the housing and mating surfaces for corrosion or debris before reassembly.

Quality Assurance

Manufactured by an OE supplier using OEM-quality materials and safety standards, Motorad 456-180 is built to meet OEM specifications and processes for dependable cooling system service.