Four Seasons 84703 HVAC Heater Control Valve

Four Seasons 84703 Shut-off Valve

The Four Seasons 84703 shut-off valve is a manual HVAC heater control valve built for heater hose routing and coolant flow control. It is a steel valve with a 5/8 in. hose inlet and 3/8 in. male pipe thread outlet, making it a direct-fit style service part for select Jeep CJ5 applications.

Key Features

• Brand: Four Seasons Shut-off Valve line
• Part number: 84703
• Manual operation type with a 90-degree in-line handle
• Steel construction for HVAC heater circuit use
• 5/8 in. hose connection to 3/8 in. male pipe thread
• Heater fittings designed for temperature control service
• Overall depth: 2.500 in.; overall B length: 2.750 in.

Product Details

Four Seasons 84703 is an HVAC heater control valve used to regulate coolant flow through the heater circuit. The shut-off valve design and manual style make it a straightforward replacement for vehicles that use a 5/8 in. hose connection and 3/8 in. threaded outlet. For Jeep CJ5 service, this valve matches manual control applications listed for 1966-1971 Jeep CJ5 without a windshield defroster kit. The Four Seasons 84703 also cross-references Focus Auto Parts 84703 for the same application.

Common Uses

• Restoring heater coolant shutoff function on a Jeep CJ5
• Replacing a leaking or sticking HVAC heater control valve
• Correcting poor heater temperature control
• Addressing coolant bypass through the heater circuit
• Replacing a damaged manual heater valve with the correct hose and thread sizes

Installation Notes

Verify hose diameter, thread size, and valve orientation before installation. This valve uses a 5/8 in. hose connection and 3/8 in. male pipe thread, so matching the existing heater plumbing is important for proper sealing and operation. Confirm the application is manual control and that the vehicle does not use a windshield defroster kit when servicing a 1966-1971 Jeep CJ5. The 90-degree handle layout should be positioned for accessible manual operation after installation.

Quality Assurance

Four Seasons is a recognized HVAC parts brand with a broad catalog of temperature control components, and the 84703 is built as a steel shut-off valve for heater service. Part number 84703 is listed with multiple interchange references, supporting identification during replacement selection.