Calorstat TH6523.87 Engine Coolant Thermostat

Engine Coolant Thermostat for Volkswagen Vanagon

Calorstat TH6523.87 is a standard engine coolant thermostat built for precise coolant flow control in the cooling system. It is listed for 1983-1991 Volkswagen Vanagon applications and matches the OE-style fit expected for Vanagon thermostat service.

Key Features

• Standard engine coolant thermostat for cooling system temperature regulation
• Start to open temperature: 188.0°F
• Sealing flange outside diameter: 2.63 in.
• Valve-seat diameter: 67.0 mm
• By-pass valve diameter: 33.0 mm
• Rubber valve design
• Gasket or seal not included
• Fits 1983-1991 Volkswagen Vanagon, N/A

Detailed Description

The Calorstat TH6523.87 thermostat is specified for Volkswagen Vanagon cooling system service where stable operating temperature matters. Its 188°F opening point, standard construction, and rubber valve design support controlled coolant circulation once the engine reaches operating temperature. This part number, TH6523.87, is also referenced in interchange listings for related OE-style applications, making it a practical choice when replacing a worn thermostat in a Vanagon.

This part cross-references Motorad (e.g., 273-192, 7273-192) for the same application.

What It Helps Address

• Engine running too cool or too warm
• Delayed warm-up after cold starts
• Temperature fluctuation during normal driving
• Cooling system flow control issues
• Thermostat replacement during cooling system service

Installation Notes and Tips

Verify housing condition and sealing surfaces before installation. Because no gasket or seal is included, use the correct separate seal for the application. Confirm thermostat orientation and bypass alignment during installation, and inspect coolant condition and system pressure after service. For Volkswagen Vanagon maintenance, match the thermostat to the OE-style cooling system layout before final assembly.

Quality Assurance

Calorstat is listed as an OE supplier to Volkswagen for this application, and TH6523.87 is built to the specified dimensions and opening temperature for direct cooling system replacement service.