Calorstat TH6273.87J Engine Coolant Thermostat

Engine Coolant Thermostat for Volkswagen Cooling Systems

Calorstat TH6273.87J is a standard engine coolant thermostat built for precise temperature control in Volkswagen cooling systems. It opens at 188.0°F and includes a rubber O-ring seal for a secure fit at the housing interface.

• Standard engine coolant thermostat design
• Start-to-open temperature: 188.0°F
• Gasket or seal included: Yes
• Seal type: O-ring
• Seal material: Rubber
• Sealing flange outside diameter: 2.12 in.
• Height between flanges: 1.22 in.
• By-pass valve diameter: 35.0 mm
• Valve-seat diameter: 54.0 mm
• Rubber valve construction

Detailed Product Overview

This Calorstat thermostat is specified for Volkswagen Beetle, Golf, Jetta, Passat, and Cabrio applications across multiple model years. The TH6273.87J part number is also referenced in aftermarket catalogs for the same application, including cross-reference part numbers such as Wix 46499 and Four Seasons 54741. As an OE supplier to Volkswagen, Vernet/Calorstat brings application-specific cooling system coverage to these vehicles.

By regulating coolant flow at the correct opening temperature, this thermostat helps maintain stable engine operating temperature in Volkswagen Beetle and Volkswagen Golf cooling systems, as well as Jetta, Passat, and Cabrio platforms. The included rubber O-ring seal and standard thermostat construction support a direct replacement approach for service work on the thermostat and housing assembly.

What This Thermostat Helps Address

• Engine running too cool or too warm
• Delayed warm-up after cold starts
• Temperature fluctuation during normal driving
• Cooling system service on a leaking thermostat seal
• Replacement of a worn thermostat in Volkswagen Beetle, Golf, Jetta, Passat, or Cabrio applications

Installation Notes and Tips

Verify housing dimensions, seal style, and opening temperature before installation. Clean the sealing surfaces thoroughly and inspect the thermostat housing for wear, corrosion, or distortion. Use the included O-ring seal during installation and confirm proper coolant fill and bleed procedures after service. This part is listed for N/A position applications.

Quality Assurance

Calorstat, also known as Vernet in OE supply channels, is identified as an OE supplier to Volkswagen for this application family. The TH6273.87J is built to match the listed fitment and thermostat specifications for service replacement use.

Compatible Vehicles

• Fits 1998-2006 Volkswagen Beetle, N/A
• Fits 1995-2006 Volkswagen Golf, N/A
• Fits 1995-2006 Volkswagen Jetta, N/A
• Fits 2004-2005 Volkswagen Passat, N/A
• Fits 1995-1997 Volkswagen Passat, N/A
• Fits 1995-2002 Volkswagen Cabrio, N/A