Calorstat TH5968.87J Engine Coolant Thermostat

Engine Coolant Thermostat for Audi and Volvo

Calorstat TH5968.87J is a standard engine coolant thermostat for select Audi, Volkswagen, and Volvo applications. It opens at 188.0°F and includes a gasket/seal with an O-ring seal design for direct replacement service on the cooling system.

Key Features

• Standard engine coolant thermostat for cooling system temperature control
• Start to open temperature: 188.0°F
• Gasket or seal included with rubber O-ring seal material
• Valve-seat diameter: 67.0 mm
• By-pass valve diameter: 35.0 mm
• Sealing flange outside diameter: 2.63 in
• Calorstat TH5968.87J thermostat housing application reference

Detailed Description

Calorstat TH5968.87J is built for vehicles that require a standard coolant thermostat with an 188°F opening temperature. The thermostat uses a rubber valve and O-ring seal to help maintain a secure seal at the housing interface, while the listed flange and valve dimensions support accurate fitment in the cooling circuit. This part is a practical replacement choice for Audi 80, Audi 90, Audi 100, Audi 200, Audi Coupe, Audi Quattro, Volkswagen Quantum, Volkswagen EuroVan, and Volvo 740, 745, and 760 applications listed in the fitment data. The TH5968.87J part number is also useful when cross-checking service records or sourcing an OE-style replacement for the same application.

This part cross-references BBB Industries 17896 and Four Seasons 17916 for the same application.

What It Helps Address

• Engine running too cool or too hot due to thermostat wear
• Delayed coolant flow control during warm-up
• Temperature fluctuation caused by a sticking thermostat
• Coolant seepage at the thermostat seal area
• Cooling system service on Audi, Volkswagen, and Volvo models with the listed fitment

Installation Notes and Tips

Verify the thermostat housing dimensions, valve-seat diameter, and bypass valve diameter before installation. Replace the thermostat only after the engine has cooled completely and the cooling system has been drained to the proper service level. Inspect the mating surfaces for corrosion or debris, and confirm the O-ring seal seats evenly before refilling and bleeding the system. For fitment confirmation, match TH5968.87J against the vehicle application and cooling system specification.

Quality Assurance

Calorstat is listed as an OE supplier to Audi and Volkswagen for the applications shown, and this thermostat is specified with defined opening temperature and dimensional data to support accurate replacement selection.