Thermostat 03F121111A for Audi

1. Core Specifications

• OEM Part Number: 03F121111A
• Opening Temperature: 80 °C
• Type: Wax-type thermostat
• Housing Material: Plastic
• Included:With seal / gasket

2. Features & Benefits

• Precise 80°C opening temperature for fast engine warm‑up and stable operation.
• High-quality plastic housing, lightweight, durable, and corrosion‑resistant.
• Integrated seal included for easy installation and reliable leak prevention.
• Stable performance ensures long service life and consistent temperature control.

3. Working Principle

• Below 80°C: Valve closed → coolant circulates only inside the engine (small cycle).
• At 80°C: Wax element expands → valve starts to open.
• Fully open: Coolant flows to the radiator (big cycle) for effective cooling.

4. Main Functions

• Controls engine coolant circulation (small / big cycle)
• Maintains optimal engine operating temperature
• Reduces cold-start wear and fuel consumption
• Prevents engine overheating