Four Seasons 74927 HVAC Heater Control Valve

Four Seasons 74927 Heater Valve

The Four Seasons 74927 heater valve is an electric HVAC temperature control component for Mercedes-Benz applications that use a solenoid with an auxiliary coolant pump. Built with thermoplastic and steel construction, it is made for precise coolant flow control in the heater circuit.

Four Seasons Heater Valve products are part of a long-running HVAC component line focused on dependable temperature control service for import vehicles. This 74927 heater valve is a direct-fit style replacement for select Mercedes-Benz CL65 AMG, S550, S600, S63 AMG, S65 AMG, CL500, CL55 AMG, CL600, S350, S430, S500, and S55 AMG applications.

Key Features

• Electric heater control valve for HVAC temperature regulation
• Solenoid w/ auxiliary coolant pump electronic heater valve design
• Non-bypass style for direct coolant flow control
• Thermoplastic / steel construction
• 4 connectors and 3 terminal pins
• Opening dimensions: 0.69 in, 0.7 in, and 17.83 mm ports
• Four Seasons 74927 replacement part number for service matching

Detailed Description

Four Seasons 74927 is an HVAC heater control valve used to regulate coolant flow through the heater core on select Mercedes-Benz vehicles. It is an electric valve with a solenoid and auxiliary coolant pump configuration, making it suitable for systems that rely on electronic temperature control rather than a manual mechanical valve. The non-bypass style and specified connector and terminal layout help support correct OE-style replacement on vehicles such as the Mercedes-Benz S500, S430, and CL600, as well as later S63 AMG and S65 AMG applications. The Four Seasons 74927 part number is also cross-referenced in the aftermarket under related numbers such as Gates EHV123.

Common Problems It Can Solve

• No heat from the cabin heater
• Heat stuck on or unable to regulate temperature
• Intermittent heater output caused by valve failure
• Coolant flow control issues in the HVAC heater circuit
• Faulty electronic heater valve operation on Mercedes-Benz models

Installation Notes and Tips

Verify connector count, terminal pin layout, and opening dimensions before installation. Confirm vehicle configuration, especially models noted as vehicle without rear A/C, to ensure the correct heater valve application. Inspect coolant hoses, electrical connectors, and surrounding HVAC components for wear or contamination before replacing the valve. After installation, refill and bleed the cooling system according to factory service procedures.

Quality Assurance

Four Seasons states that its HVAC products are engineered and tested for years of trouble-free operation, backed by more than 50 years of mobile A/C experience. The 74927 heater valve is built to support reliable service in Mercedes-Benz heating and cooling systems.