Calorstat TH0963.80 Engine Coolant Thermostat

Engine Coolant Thermostat for 80 C Applications

The Calorstat TH0963.80 engine coolant thermostat is a standard replacement thermostat set to begin opening at 176 F (80 C). It helps regulate coolant flow so the engine reaches and maintains the proper operating temperature in a wide range of GM, Suzuki, Isuzu, Pontiac, Buick, and Oldsmobile applications.

Use this Calorstat TH0963.80 thermostat when servicing cooling systems on vehicles such as the Chevrolet S10, GMC Sonoma, and Chevrolet Camaro. The 1.71-inch sealing flange outside diameter and 0.9-inch height between flanges support a direct-fit style installation in the listed applications.

Key Features

• Standard engine coolant thermostat for cooling system temperature control
• Starts to open at 176 F / 80 C
• Sealing flange outside diameter: 1.71 in.
• Height between flanges: 0.9 in.
• Gasket or seal not included
• Calorstat TH0963.80 part number for ordering and cross-reference

Detailed Description

Calorstat TH0963.80 is an engine coolant thermostat built for vehicles that use an 80 C opening temperature. By regulating when coolant begins to circulate through the radiator, it supports stable engine temperature control in everyday driving and under load. This thermostat is listed for broad fitment across many older domestic and import platforms, including Chevrolet S10, GMC Sonoma, Pontiac Firebird, and Buick LeSabre applications. This part cross-references Stant 45848 and Four Seasons 33428 for the same application.

What This Thermostat Helps Address

• Engine running too cool or taking too long to reach operating temperature
• Temperature fluctuations caused by a worn thermostat
• Cooling system service on vehicles calling for an 80 C thermostat
• Replacement during radiator, water pump, or coolant flush maintenance
• Restoring proper coolant flow control in the listed applications

Installation Notes and Tips

• Verify the thermostat opening temperature matches the vehicle specification before installation.
• Inspect the thermostat housing and sealing surfaces for corrosion or damage.
• No gasket or seal is included, so confirm the correct seal is sourced separately.
• Bleed air from the cooling system after service to help prevent hot spots and inaccurate temperature readings.
• Confirm fitment by year, make, and model before ordering; this TH0963.80 application list includes Chevrolet S10, GMC Sonoma, Chevrolet Camaro, Pontiac Firebird, and other listed vehicles.

Quality Assurance

Calorstat cooling system components are cataloged for OE-style replacement use across the listed applications. The TH0963.80 thermostat is specified for 80 C operation and is identified by the Calorstat TH0963.80 part number for accurate matching during service.