MAHLE TX50187D Engine Coolant Thermostat Insert with Gasket 87°C

The MAHLE TX50187D is an OE-quality engine coolant thermostat insert designed to precisely regulate your vehicle's engine coolant temperature. With an opening temperature of 87°C (189°F) and an included gasket (indicated by the "D" suffix), this thermostat insert is a direct-fit replacement engineered to OEM specifications.

MAHLE is a world-class supplier of thermal management components to vehicle manufacturers globally. This thermostat insert maintains optimal engine operating temperature by controlling coolant flow between the engine and radiator — keeping the engine from running too cold or overheating.

Key Features:

• Opening Temperature: 87°C (189°F) — built into the part number per MAHLE's naming convention
• Includes gasket for a complete, leak-free installation ("D" suffix designation)
• Designed to OE (original equipment) specifications for a direct, precise fit
• Calibrated wax expansion element for accurate, consistent temperature regulation
• Constructed from premium materials for long-lasting durability and reliability
• Trusted by OEM manufacturers and professional technicians worldwide

The thermostat insert works by using a wax expansion element that responds to coolant temperature changes — opening coolant flow to the radiator as the engine reaches operating temperature, and closing it during warm-up to help the engine reach efficiency faster. Replacing a failed thermostat promptly prevents engine overheating and protects components such as the radiator, head gasket, and water pump.