Four Seasons 74943 HVAC Heater Control Valve

Four Seasons 74943 Heater Valve for Tesla

The Four Seasons 74943 is a rotary electronic HVAC heater control valve built for precise coolant flow management in Tesla heating systems. It is a motor-actuated bypass-style valve with a plastic body, four connectors, and 0.750 in openings for direct replacement service on select Tesla S and Tesla X applications.

Key Features

• Rotary electronic heater valve for HVAC temperature control
• Motor actuated bypass design for controlled heater circuit flow
• Plastic construction for OE-style fit and function
• 4 connector electrical interface
• 0.750 in inlet/outlet openings
• Four Seasons heater valve part number 74943

Product Details

Four Seasons Heater Valve line components are engineered and tested for dependable operation in mobile air conditioning and heating systems. The 74943 heater control valve is built to regulate coolant flow through the heater circuit, helping maintain proper cabin temperature control in Tesla S and Tesla X models. This part cross-references Gates EHV144 for the same application. If you are searching for a Tesla S heater valve or a Tesla X HVAC heater control valve, Four Seasons 74943 is a direct-fit service part for the listed vehicles.

Vehicle Fitment

• Fits 2012-2021 Tesla S, N/A, 4 Ports; Heater Valve
• Fits 2016-2021 Tesla X, N/A, 4 Ports; Heater Valve

Common Issues This Part Can Address

• Inconsistent cabin heat output
• Heater flow control problems in the HVAC system
• Temperature blending issues caused by a faulty valve
• Coolant routing concerns at the heater circuit
• Electrical actuation faults at the heater valve connector

Installation Notes

Verify connector count, opening size, and bypass-style configuration before installation. Confirm the vehicle’s HVAC diagnosis and inspect related coolant lines, electrical connectors, and control signals during replacement. Match the part number 74943 to the original valve when servicing Tesla S or Tesla X heater control systems.

Quality Assurance

Four Seasons states that its HVAC components are engineered and tested for long service life, drawing on more than 50 years of mobile A/C experience. The Heater Valve product line is built to support reliable heater control performance in demanding automotive applications.