Calorstat THF1378.73 Engine Coolant Thermostat

Engine Coolant Thermostat for Select Vehicles

Calorstat THF1378.73 is a standard engine coolant thermostat built for precise temperature control in a wide range of domestic and import applications. It opens at 73 C / 163 F, helping regulate coolant flow for stable operating temperature in vehicles such as Dodge Dakota, Jeep Cherokee, and Chevrolet C1500 platforms.

• Standard engine coolant thermostat for cooling system service
• Opening temperature: 73 C / 163 F
• Sealing flange outside diameter: 2.12 in.
• Height between flanges: 0.88 in.
• Direct replacement style for common thermostat and housing applications
• Part number: THF1378.73

Fitment and Cross References

Compatible with a broad range of vehicles from 1973-2003, including Fits 1997-2003 Dodge Dakota, N/A; Fits 1998-2003 Dodge Durango, N/A; Fits 1993-2003 Jeep Grand Cherokee, N/A; Fits 1988-1997 Chevrolet C1500, N/A; and Fits 1988-1995 GMC K1500, N/A. This part cross-references Dorman - HELP 45356 and Motorad 2000-160 for the same application.

Key Features

• Calorstat THF1378.73 thermostat for cooling system temperature regulation
• 73 C / 163 F opening point for specified applications
• Standard design for routine thermostat replacement
• Fits many Dodge, Jeep, Chevrolet, GMC, Ford, Cadillac, Buick, Pontiac, and Hyundai models
• Useful for service on older trucks, vans, SUVs, and passenger cars

What This Thermostat Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant circulation after startup
• Temperature fluctuation from a sticking thermostat
• Cooling system service on high-mileage vehicles
• Replacement during radiator, water pump, or housing maintenance

Installation Notes and Tips

Verify the opening temperature, flange dimensions, and vehicle application before installation. Clean the housing sealing surface thoroughly and inspect the gasket area, coolant condition, and thermostat housing for corrosion or damage. For best results, refill and bleed the cooling system according to the vehicle service procedure after replacement.

Quality Assurance

Calorstat cooling components are built for application-specific fitment and consistent thermostat operation. Confirm THF1378.73 against your vehicle’s cooling system specifications before ordering.