Calorstat TH6533.92J Engine Coolant Thermostat

Engine Coolant Thermostat for Volkswagen and Audi

Calorstat TH6533.92J is a standard engine coolant thermostat built for precise coolant flow control in select Volkswagen and Audi applications. It features a 198.0°F start-to-open temperature, an included O-ring seal, and a jiggle pin weep hole for proper air bleeding during service.

Compatible With 1999-2005 Volkswagen Passat and 1999-2001 Audi A4, A4 Quattro, A6, and A6 Quattro. This Calorstat thermostat, part number TH6533.92J, is a direct-fit cooling system service part for vehicles that require the specified thermostat dimensions and bypass-valve design.

Key Features

• Standard engine coolant thermostat for cooling system temperature regulation
• Starts to open at 198.0°F for controlled coolant circulation
• Includes gasket or seal with rubber O-ring seal type
• Jiggle pin weep hole helps purge trapped air during installation and service
• Rubber valve construction with bypass valve diameter of 35.0 mm
• Sealing flange outside diameter: 2.63 in.
• Height between flanges: 0.98 in.
• Valve-seat diameter: 67.0 mm

Detailed Description

Calorstat TH6533.92J is engineered as an OE-style engine coolant thermostat for Volkswagen Passat and Audi A4, A4 Quattro, A6, and A6 Quattro applications. The thermostat’s 198.0°F opening point helps maintain the engine at its intended operating temperature, supporting stable coolant flow through the radiator and heater circuit. The included rubber O-ring seal and jiggle pin weep hole simplify sealing and air management during cooling system service.

This part cross-references Motorad 304-198 for the same application. It also aligns with OE-style replacement needs for Volkswagen and Audi cooling systems where the specified flange, bypass, and valve-seat dimensions are required. Part number TH6533.92J is a practical choice when replacing a thermostat during routine cooling system maintenance or repair.

What It Helps Address

• Engine running too cool or taking too long to reach operating temperature
• Engine running hotter than normal due to thermostat sticking
• Temperature fluctuations caused by worn thermostat internals
• Coolant seepage at the thermostat seal area
• Air pockets in the cooling system after thermostat service

Installation Notes and Tips

Verify the thermostat housing style, bypass-valve diameter, and sealing dimensions before installation. Replace the thermostat with the included O-ring seal and make sure the sealing surfaces are clean and free of old gasket material. Position the jiggle pin weep hole according to the vehicle service procedure so trapped air can escape during refill and bleeding.

For best results, inspect the coolant condition, housing, and adjacent hoses before reassembly. Confirm fitment for your specific Volkswagen Passat or Audi A4, A4 Quattro, A6, or A6 Quattro application before ordering.

Quality Assurance

Calorstat supplies cooling system components for OE-style service applications, and this thermostat is built to match the listed fitment and dimensional requirements for the specified Volkswagen and Audi vehicles.