The BEMWQ Thermostat (Part No.: 2742000715) is a high-precision engine cooling component designed for Mercedes-Benz vehicles equipped with the M274 1.6L/2.0L turbocharged inline-4 engine. It is fully compatible with chassis models including the W205 (C-Class), V212 (E-Class), X204 (GLK-Class), X253 (GLC-Class), and W448 (V-Class/Vito). This unit functions as a map-controlled (electronically regulated) thermostat, engineered to meet or exceed OEM specifications. It is responsible for precisely regulating coolant flow between the engine and radiator, maintaining the optimal operating temperature to ensure efficient combustion, reduced emissions, and proper lubrication.

• Precision OEM Specification:​ Manufactured to match the original equipment standard 2742000715, ensuring exact calibration of the opening temperature, correct electrical connector pinout for the heating element, and seamless integration with the M274 engine’s cooling circuit without modification.
• Map-Controlled Precision:​ Designed as an electrically actuated unit that works in conjunction with the ECU to dynamically advance or retard the opening point, keeping the engine temperature consistently within the ideal range for varying load and fuel economy conditions.
• Durable Construction:​ Built with robust materials (such as high-grade wax elements, stainless steel springs, and high-temperature resistant housings or composite alloys) capable of withstanding constant thermal cycling, coolant corrosion, and high under-hood temperatures for extended service life.
• Direct Fitment:​ Engineered as a direct replacement unit, ready for straightforward installation using existing mounting points and connectors, ensuring a secure and leak-free seal.

• Prevention of Overheating & Costly Damage:​ Effectively eliminates the risk of the thermostat sticking closed, which can lead to rapid engine overheating, warped cylinder heads, or blown head gaskets, thereby protecting the core engine components.
• Restored Fuel Efficiency & Cabin Heat:​ Fixes issues caused by a thermostat stuck in the open position—such as the engine never reaching operating temperature, poor fuel economy, a rich-running condition, and weak cabin heater performance—by ensuring rapid and accurate engine warm-up.
• Reliable Operation & Diagnostics:​ Helps clear common thermostat-related diagnostic trouble codes (e.g., P0128 for coolant temperature below thermostat regulating temperature, or P0597-P0599 regarding heater control circuit faults) and restores normal ECU-controlled cooling fan operation.
• Cost-Effective Maintenance Solution:​ Offers a dependable and economical alternative to dealer original parts for both corrective repairs (when the original thermostat fails, a common issue as the vehicle ages or reaches higher mileage) and preventative maintenance, delivering long-lasting reliability and precise thermal management.