Calorstat TH6533.80J Engine Coolant Thermostat

Engine Coolant Thermostat for OE-Style Cooling Control

The Calorstat TH6533.80J engine coolant thermostat is a standard replacement thermostat built for precise coolant flow control in Volkswagen, Audi, and Porsche applications. It opens at 180°F and includes an O-ring seal and rubber valve for a direct-fit cooling system service part.

Key Features

• Standard engine coolant thermostat design
• Start to open temperature: 180°F
• Gasket or seal included for installation
• O-ring seal type with rubber seal material
• Jiggle pin weep hole for air bleeding
• By-pass valve diameter: 35.0 mm
• Sealing flange outside diameter: 2.63 in
• Valve-seat diameter: 67.0 mm
• Height between flanges: 0.98 in
• Calorstat TH6533.80J thermostat for OE-style cooling system service

Detailed Description

Calorstat TH6533.80J is an engine coolant thermostat designed to regulate coolant temperature and help maintain stable operating conditions. Its 180°F opening point matches the listed OE-style application requirements, while the included O-ring seal and rubber valve support a secure seal at the housing interface. This thermostat is listed for select Audi A3 Quattro and TT Quattro models, Volkswagen Eos, R32, Touareg, and EuroVan, as well as Porsche Cayenne applications. Vernet is an OE supplier to Audi and Volkswagen for the listed fitments.

This part cross-references 028 280 0008 and 022121113 for the same application. The TH6533.80J part number is also useful when searching for a direct replacement thermostat for 2004-2006 Porsche Cayenne, 2004-2006 Volkswagen Touareg, or 2006-2009 Audi A3 Quattro cooling system service.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant circulation during warm-up
• Temperature fluctuation from a sticking thermostat
• Coolant seepage at the thermostat seal area
• Air trapped in the cooling circuit after service

Installation Notes and Tips

• Verify the housing and sealing surfaces are clean before installation.
• Match the thermostat orientation to the original part and cooling passage layout.
• Use the included O-ring seal and confirm proper seating before refilling coolant.
• Bleed the cooling system after installation to remove trapped air.
• Confirm the application by year, make, and model before ordering TH6533.80J.

Quality Assurance

Calorstat cooling components are built to OE-style specifications for the listed applications, and the fitment data includes Audi, Volkswagen, and Porsche models with OE supplier references noted for Audi and Volkswagen coverage.

• Fits 2006-2009 Audi A3 Quattro, N/A
• Fits 2008-2009 Audi TT Quattro, N/A
• Fits 2004-2006 Audi TT Quattro, N/A
• Fits 2007-2008 Volkswagen Eos, N/A
• Fits 2008 Volkswagen R32, N/A
• Fits 2004 Volkswagen R32, N/A
• Fits 2004-2006 Porsche Cayenne, N/A
• Fits 2004-2006 Volkswagen Touareg, N/A
• Fits 2002-2003 Volkswagen EuroVan, N/A