Calorstat TH6276.87J Engine Coolant Thermostat

Engine Coolant Thermostat for Volkswagen and Audi

Calorstat TH6276.87J is a standard engine coolant thermostat built for precise coolant flow control in select Volkswagen and Audi applications. It opens at 188.0°F and includes a rubber O-ring seal for a secure, leak-resistant fit.

• Standard engine coolant thermostat design
• Start to open temperature: 188.0°F
• Seal included: yes
• Seal type: O-ring
• Seal material: rubber
• Valve-seat diameter: 54.0 mm
• Sealing flange outside diameter: 2.12 in
• Height: 23.0 mm
• Height between flanges: 0.9 in
• Height, by-pass side: 23.0 mm

Detailed Fitment and Application

Built for direct replacement service, this Calorstat thermostat supports proper engine warm-up and temperature regulation in Volkswagen Jetta, Golf, Beetle, Passat, GTI, Golf City, and Jetta City models, as well as Audi A4, A4 Quattro, TT, and TT Quattro applications. The TH6276.87J part number is also referenced in OE-style interchange listings for related cooling system service.

This part cross-references MAHLE 54368 and Quality-Built 17890 for the same application.

What It Helps Address

• Engine running too cool or taking too long to reach operating temperature
• Temperature fluctuations caused by a worn thermostat
• Coolant flow control issues affecting heater performance
• Overheating concerns related to thermostat sticking
• Leakage at the thermostat seal area

Installation Notes and Tips

Verify the thermostat housing, sealing surface, and coolant condition before installation. Replace the O-ring seal as supplied, and confirm the valve-seat diameter, flange diameter, and height match the original part before assembly. After installation, refill and bleed the cooling system according to the vehicle service procedure.

Quality Assurance

Calorstat is listed as an OE supplier to Volkswagen and Audi for these applications, supporting OE-style fitment expectations for the TH6276.87J thermostat. Confirm vehicle year, engine code, and housing configuration against the catalog before ordering.