Calorstat TH1439.92J Engine Coolant Thermostat

Engine Coolant Thermostat for OE-Style Cooling Control

The Calorstat TH1439.92J engine coolant thermostat is a standard replacement thermostat for select Volkswagen, Audi, Porsche, and Ford applications. It opens at 197°F (92°C) to help regulate coolant flow and maintain stable operating temperature in the cooling system.

Built with a gasket O-ring seal and included gasket/seal, this thermostat is specified with a 2.12 in sealing flange outside diameter, 1.24 in height between flanges, and a 53.9 mm valve-seat diameter for proper housing fitment. The TH1439.92J is also listed with a 35.0 mm by-pass valve diameter and rubber + paper seal material.

Key Features

• Calorstat TH1439.92J engine coolant thermostat
• Standard thermostat design for cooling system temperature regulation
• Starts to open at 197°F / 92°C
• Gasket or seal included
• Gasket O-ring seal type
• Sealing flange outside diameter: 2.12 in
• Valve-seat diameter: 53.9 mm
• By-pass valve diameter: 35.0 mm
• OE supplier context noted for Volkswagen and Audi applications

Detailed Description

Use the Calorstat TH1439.92J when servicing a cooling system that requires a 92°C thermostat. This part number is listed across a wide range of fitments, including 1985-1998 Volkswagen Golf, 1980-1998 Volkswagen Jetta, 1990-1994 Volkswagen Passat, 1983-1991 Porsche 944, and 1988-1990 Audi 80. It also appears in select Ford applications such as the 1986 Ford Aerostar and 1985-1986 Ford E-150 Econoline. This part cross-references Four Seasons 33209 and Gates 33209S for the same application.

For buyers searching for a thermostat for Volkswagen Golf, Jetta, Passat, Porsche 944, or Audi 80 cooling system repair, TH1439.92J provides the listed dimensions and opening temperature needed for a direct-match replacement search.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant circulation after cold start
• Temperature fluctuation during normal driving
• Cooling system service on OE-style applications
• Replacement of a thermostat with a worn seal or housing interface

Installation Notes and Tips

• Verify the opening temperature is 92°C / 197°F before installation.
• Confirm flange diameter, valve-seat diameter, and by-pass valve size against the original part.
• Inspect the thermostat housing and sealing surfaces for corrosion or debris.
• Replace the seal using the included gasket or O-ring as specified.
• Bleed the cooling system after service to remove trapped air and restore proper circulation.

Quality Assurance

Calorstat is listed as an OE supplier for Volkswagen and Audi applications in the fitment data, supporting selection for service work that calls for an OE-style thermostat. The TH1439.92J is specified with defined dimensions and a 197°F opening temperature for accurate cooling system replacement.