Calorstat TH5977.92 Engine Coolant Thermostat

Engine Coolant Thermostat for Ford and Mazda

Calorstat TH5977.92 is a standard engine coolant thermostat built for temperature control in select Ford and Mazda cooling systems. It opens at 197°F (92°C) to help regulate coolant flow and maintain stable operating temperature in applications such as Ford Explorer, Ford Ranger, Mazda B4000, Ford Aerostar, and Mazda Navajo.

Key Features

• Standard engine coolant thermostat for cooling system service
• Start to open temperature: 197°F / 92°C
• Sealing flange outside diameter: 2.04 in.
• Height between flanges: 0.88 in.
• Gasket or seal not included
• Direct-fit application coverage for select Ford Ranger and Ford Explorer models

Product Details

Calorstat TH5977.92 is specified for vehicles that use a 92°C thermostat opening point, making it a practical replacement when restoring proper coolant regulation. This thermostat is listed for 1990-2000 Ford Ranger, 1991-2000 Ford Explorer, 1994-2000 Mazda B4000, 1995-1997 Ford Aerostar, and 1991-1994 Mazda Navajo. The part number TH5977.92 is also referenced in interchange listings for related OE and aftermarket applications.

This part cross-references Motorad (e.g., 333-198, 5333-198) for the same application.

What It Helps Address

• Engine running too cool or taking too long to reach operating temperature
• Temperature fluctuation caused by a worn thermostat
• Restricted coolant flow control in the thermostat housing circuit
• Cooling system service on Ford Explorer and Ford Ranger platforms
• Replacement needs for Mazda B4000 and Mazda Navajo cooling systems

Installation Notes and Tips

Verify housing condition and clean the sealing surfaces before installation. Because no gasket or seal is included, use the correct separate seal for the application. Confirm the thermostat orientation and opening temperature match the vehicle’s cooling system requirements before reassembly. The TH5977.92 is a standard thermostat, so proper fitment depends on matching the listed engine cooling application and dimensions.

Quality Assurance

Calorstat cooling components are cataloged for OE-style service applications and are identified here with confirmed fitment data and dimensional specifications. Use the listed vehicle coverage and temperature rating to verify application before installation.