MAHLE 11-53-7-836-155 Engine Coolant Thermostat C - 79

The MAHLE 11-53-7-836-155 is a precision-engineered engine coolant thermostat designed to maintain optimal operating temperature in high-performance BMW engines. This OE-quality thermostat opens at 79 degrees Celsius (174 degrees Fahrenheit) to regulate coolant flow between the engine and radiator, ensuring efficient engine performance while minimizing wear and emissions.

Key Features:

• Opening temperature: 79°C (174°F) for precise temperature control
• Individually calibrated for accurate temperature regulation
• Includes gasket for complete installation
• OEM-equivalent quality from MAHLE, a trusted automotive components manufacturer
• Lightweight design at 174 grams (0.38 lbs)

The thermostat works by blocking coolant flow to the radiator until the engine reaches optimal temperature, then opens to allow coolant circulation for proper cooling. A wax pellet inside the valve melts at the specified temperature, causing the valve to expand and open. This component is critical for preventing engine overheating when stuck closed, or inefficient warm-up and rich fuel mixture when stuck open.

Technical Specifications:

• Manufacturer Part Number: THD 1 79 (THD179)
• OEM Part Number: 11537836155
• Package Dimensions: 12.0cm L x 11.2cm W x 11.2cm H (4.7" x 4.4" x 4.4")
• Weight: 174 grams (0.38 lbs)
• Includes: Thermostat and gasket

This thermostat should be replaced when cooling system components fail or during major cooling system service to ensure continued reliability. Installation requires bleeding the cooling system to remove trapped air for proper pressurization and coolant circulation.