Calorstat TH5981.89J Engine Coolant Thermostat

Engine Coolant Thermostat for Ford and Saab Applications

Calorstat TH5981.89J is a standard engine coolant thermostat built for precise temperature control in a wide range of Ford, Lincoln, Mercury, Saab, Chevrolet, and Pontiac applications. It opens at 192°F (89°C) and includes a gasket and rubber seal for a direct replacement service.

Key Features

• Standard engine coolant thermostat with a 192°F opening temperature
• Includes gasket or seal for installation
• Jiggle pin weep hole for air bleeding during cooling system service
• Rubber seal material with gasket-style sealing
• Sealing flange outside diameter: 2.12 in.
• Height between flanges: 1.33 in.
• By-pass valve diameter: 29.0 mm
• Valve-seat diameter: 54.0 mm

Detailed Description

Calorstat TH5981.89J is an engine coolant thermostat for vehicles that require 89°C / 192°F temperature regulation. It is used across many Ford truck, van, SUV, and performance platforms, including Ford F-150, Ford Explorer, Ford Expedition, Lincoln Navigator, Mercury Grand Marquis, and Saab 9-3 and 9-5 applications. The included gasket and jiggle pin weep hole support proper sealing and coolant flow management during cooling system operation. This part cross-references Gates 33469S for the same application.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed warm-up after cold starts
• Temperature fluctuation in the cooling system
• Coolant flow control issues caused by a sticking thermostat
• Sealing problems at the thermostat housing interface

Installation Notes and Tips

• Drain coolant before removing the thermostat housing.
• Clean the sealing surfaces thoroughly before installing the new gasket.
• Verify the thermostat orientation and jiggle pin position during assembly.
• Refill and bleed the cooling system to remove trapped air after installation.
• Confirm the application calls for a 192°F opening temperature before replacement.

Quality Assurance

Calorstat TH5981.89J is specified with measured dimensions for sealing and bypass fitment, including a 2.12 in. sealing flange outside diameter and 29.0 mm by-pass valve diameter. Its 192°F opening point matches the listed OE-style temperature requirement for supported Ford, Lincoln, Mercury, Saab, Chevrolet, and Pontiac vehicles.