Calorstat TH4561.71J Engine Coolant Thermostat

Engine Coolant Thermostat for Volkswagen and Volvo

Calorstat TH4561.71J is a standard engine coolant thermostat with a 160°F opening temperature for precise coolant flow control. It includes a gasket seal and a jiggle pin weep hole, making it a practical replacement for a wide range of Volkswagen, Volvo, Audi, Ford, Porsche, and Mercury applications.

Key Features

• Standard engine coolant thermostat for temperature regulation
• Starts to open at 160.0°F / 71°C
• Gasket included with rubber seal material
• Jiggle pin weep hole for air bleeding during service
• Sealing flange outside diameter: 2.12 in.
• Valve-seat diameter: 54.0 mm
• By-pass valve diameter: 35.0 mm
• Height between flanges: 1.2 in.

Detailed Description

Calorstat TH4561.71J is an engine coolant thermostat built for vehicles that require a 71°C / 160°F opening temperature. It helps regulate coolant circulation so the engine can reach and maintain operating temperature more consistently. This part number is used across many applications, including Volkswagen Golf, Jetta, Passat, Beetle, and Cabrio models, as well as Volvo S40, V40, S60, V70, C70, S70, S90, V90, 850, and 960 applications. It also cross-references Bosch 13376 for the same application.

What It Helps Address

• Engine running too cool or taking too long to warm up
• Temperature fluctuation caused by a worn thermostat
• Coolant flow issues related to a sticking thermostat valve
• Air trapped in the cooling system after service
• Fitment needs for a 160°F thermostat in older import and domestic applications

Installation Notes and Tips

Verify the thermostat housing style, sealing flange diameter, and valve-seat dimensions before installation. Replace the gasket seal during service and make sure the mating surfaces are clean and free of old seal material. The jiggle pin weep hole should be positioned to help purge trapped air during filling. Confirm the required opening temperature matches the vehicle specification before final assembly.

Quality Assurance

Calorstat TH4561.71J is specified with a gasket seal, rubber seal material, and OE-style dimensional details for service replacement use. Confirmed fitment includes 2011-2013 Volkswagen Clasico, 2007-2010 Volkswagen Bora, 1998-2009 Volkswagen Pointer, 2000-2004 Volvo S40, and 2001-2003 Volvo S60, along with many additional listed applications.