MAHLE 03L-121-111 AM Engine Coolant Thermostat with Housing

The MAHLE 03L-121-111 AM is a premium-grade engine coolant thermostat assembly engineered to OEM standards for Audi and Volkswagen vehicles. This integral thermostat features a start-to-open temperature of 87°C, ensuring your engine maintains optimal operating temperature for efficient performance and preventing overheating.

Key Features:

• Complete assembly includes housing and seal ring for convenient installation
• 87°C (189°F) opening temperature for precise coolant flow regulation
• Manufactured by MAHLE Behr, a leading OEM supplier with over 100 years of automotive excellence
• Direct replacement for OE part number 03L 121 111 AM
• Also known as MAHLE part number TI 33 87

The thermostat regulates coolant flow to the radiator, blocking circulation until the engine reaches proper operating temperature, then opening to allow coolant flow and prevent overheating. Common diagnostic trouble codes associated with thermostat failure include P0128, which indicates the engine is not reaching proper temperature. Installation note: Also requires water pipe o-ring 06B 121 687 (sold separately).

Cross-Reference Numbers: 03L121111AM, 03L 121 111 AM, TI 33 87, TI3387, TI-33-87