Calorstat TH5971.82 Engine Coolant Thermostat

Engine Coolant Thermostat for OE-Style Cooling Control

Calorstat TH5971.82 is a standard engine coolant thermostat built for precise coolant flow regulation in supported applications. It opens at 180°F (82°C) and uses an off-set valve seat design to match the cooling system requirements of select Honda and Isuzu vehicles.

• Standard engine coolant thermostat for cooling system temperature control
• Start-to-open temperature: 180°F / 82°C
• Off-set valve seat design for application-specific fitment
• Sealing flange outside diameter: 2.12 in.
• Height between flanges: 0.96 in.
• Gasket or seal not included

Fitment and Application Details

Compatible With 1995-1997 Isuzu Rodeo, N/A; 1995-1996 Honda Passport, N/A; and 1995 Isuzu Pickup, N/A. This Calorstat TH5971.82 thermostat is a direct-fit cooling system service part for vehicles listed in the fitment data, including Honda Passport and Isuzu Rodeo applications.

This part cross-references Gates 33478S and Stant 45858 for the same application.

What This Thermostat Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant circulation after cold starts
• Temperature fluctuation from a thermostat that no longer opens at the correct point
• Cooling system service on vehicles requiring an 180°F thermostat
• Replacement of a thermostat with an off-set valve seat configuration

Installation Notes and Tips

Verify the thermostat housing dimensions and sealing surface before installation. Because a gasket or seal is not included, reuse is not recommended unless the existing seal is confirmed serviceable and the application allows it. Always bleed the cooling system after service and refill with the correct coolant specification for the vehicle.

Quality Assurance

Calorstat cooling system components are built to meet application-specific thermostat requirements, including opening temperature and physical dimensions. Confirm fitment against the vehicle listing and part number TH5971.82 before installation.