Rein CTI0009 Engine Coolant Thermostat

OE Quality Thermostat Insert for Volkswagen and Audi

Rein CTI0009 is an OE quality engine coolant thermostat insert built for direct replacement service in select Volkswagen and Audi cooling systems. It is calibrated to open at 80 degrees Celsius to help maintain the engine’s intended operating temperature, with fit and materials aligned to original equipment expectations.

Compatible With long-tail applications such as a 1998-2006 Volkswagen Beetle thermostat insert, 1985-2006 Volkswagen Golf thermostat insert, and 1988-1990 Audi 80 thermostat insert. Rein CTI0009 is also used across select Jetta, Passat, Cabrio, Cabriolet, Fox, Corrado, Audi 90, Audi 4000, and Volkswagen Quantum applications.

Key Features

• Matches original equipment design specifications
• Thermostat calibrated to 80 degrees Celsius
• Manufactured to strict engineering standards for materials and tolerances
• High-quality metal and plastic construction for durability and service life
• Gaskets or seals needed for installation are supplied with the thermostat
• Direct replacement thermostat insert for OE-style service

Detailed Description

Rein CTI0009 thermostat insert is designed for vehicles that require an 80c coolant temperature rating and OE-style fitment. The insert is produced to meet or exceed the materials used in the original component, with attention to consistent response and dependable cooling system control. For Volkswagen Beetle, Golf, Jetta, and Passat models, as well as select Audi 80 and Audi 90 applications, this thermostat insert supports stable engine temperature management in everyday driving and repair work. This part cross-references 056121113A for the same application.

Common Cooling System Issues It May Address

• Engine running too cool or taking too long to reach operating temperature
• Temperature fluctuations caused by a worn thermostat insert
• Cooling system service needs on high-mileage Volkswagen and Audi vehicles
• Improper thermostat opening temperature affecting heater performance
• Replacement of a damaged or aging OE thermostat insert

Installation Notes and Tips

Install CTI0009 only in applications that call for an 80c thermostat insert. Verify the housing condition, clean the sealing surfaces, and inspect the cooling system for contamination before assembly. Because the thermostat is application-specific, confirm year, make, model, and engine cooling configuration against the vehicle listing before installation.

Quality Assurance

Rein manufactures this thermostat insert to OE quality standards using durable materials and controlled temperature calibration for consistent operation. The design focus is direct replacement fit, reliable sealing, and service life appropriate for professional repair and maintenance.