Calorstat TH1378.70 Engine Coolant Thermostat

Engine Coolant Thermostat for Broad V8 and V6 Fitment

Calorstat TH1378.70 is a standard engine coolant thermostat built for direct replacement service across a wide range of Dodge, Jeep, Chevrolet, GMC, Ford, and other applications. It opens at 158°F (70°C) to help regulate coolant flow and maintain stable operating temperature.

• Standard engine coolant thermostat for replacement cooling system service
• Start-to-open temperature: 158°F / 70°C
• Sealing flange outside diameter: 2.12 in.
• Height between flanges: 0.88 in.
• Jiggle pin weep hole: Yes
• Compatible with many Dodge Dakota, Ram 1500, Jeep Cherokee, and Chevrolet/GMC truck applications

Fitment and Application Details

This thermostat is used in cooling systems that require a 70°C opening temperature and the listed flange dimensions. It is a direct-fit option for many older domestic trucks, vans, SUVs, and passenger cars, including Fits 1997-2003 Dodge Dakota, Fits 1997-2003 Dodge Ram 1500, and Fits 1993-2003 Jeep Grand Cherokee. It also covers applications such as Fits 1988-1995 Chevrolet C1500, Fits 1988-1995 GMC K1500, and Fits 1975-1986 Chevrolet C10.

This part cross-references Gates 33006S and Anchor 300070 for the same application. Part number TH1378.70 is also a useful reference when verifying cooling system service parts for Dodge Ram 2500, Jeep Wrangler, and Chevrolet/GMC truck fitment.

What This Thermostat Helps Address

• Engine running too cool or too warm
• Delayed warm-up after cold starts
• Temperature fluctuation during stop-and-go driving
• Coolant flow control issues caused by a worn thermostat
• Cooling system service on high-mileage vehicles

Installation Notes and Tips

Confirm the thermostat opening temperature, flange diameter, and height between flanges before installation. Clean the housing sealing surface thoroughly and verify coolant condition during service. The jiggle pin weep hole should be oriented to allow trapped air to escape during refill, following the vehicle manufacturer’s cooling system procedure.

Quality Assurance

Calorstat TH1378.70 is specified as a standard thermostat with defined dimensional and temperature characteristics for accurate replacement selection. Verify fitment against the vehicle listing and cooling system requirements before installation.