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Four Seasons 74678 HVAC Heater Control Valve
| Brand | Four Seasons 74678 |
|---|---|
| Hose Connector Quantity | 2 connectors |
| Description | Cable operated non-bypass closed heater valve |
| Material | Steel |
| O.E. Replacement? | Yes |
| Opening B IN | 0.750 |
| Opening B MM | 19.050 |
| Opening IN | 0.750 |
| Opening MM | 19.050 |
| Operation Type | Cable |
| Style | Non-bypass |
| Type | Heater valves |
| Fits | — |
OE replacement. Cable-operated heater valve for a direct-fit repair.
Steel construction. Built for dependable performance in HVAC temperature control.
Non-bypass style. Helps regulate coolant flow through the heater valve.
Cross-references Anchor 2108, Bosch 15150 and Eastern Catalytic 30502 for the same application. See all 32.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Four Seasons 74678 Heater Control Valve
Four Seasons 74678 is a cable-operated HVAC heater control valve built as an OE replacement for vehicles that use a closed, non-bypass heater valve design. It uses a steel body and two hose connectors with a 0.750 in. (19.050 mm) opening for direct replacement in the heater hose circuit.
For drivers searching for a heater valve for Honda Civic or similar HVAC temperature control applications, this Four Seasons heater valve supports precise coolant flow control through the heater core. The Four Seasons Heater Valve line focuses on replacement parts that match original equipment function and connection style.
Key Features
- Part number 74678 for OE-style heater valve replacement
- Cable-operated design for manual HVAC temperature control
- Non-bypass, closed valve style
- Steel construction for heater hose circuit durability
- Two hose connectors
- 0.750 in. / 19.050 mm opening size
- OE replacement part
Product Details
This HVAC heater control valve regulates coolant flow to the heater core based on cable input from the climate control system. The non-bypass configuration is used where the valve closes flow rather than routing coolant around the heater circuit. Four Seasons 74678 is a direct-fit style replacement for applications that require a cable-operated heater valve with a 3/4 in. opening and steel construction.
This part cross-references Monroe Shocks & Struts 173138 for the same application.
Common Problems It Can Address
- Heater output stuck on hot or cold
- Loss of cabin temperature control from a worn valve
- Coolant flow restriction through the heater hose circuit
- Leaking or sticking heater control valve operation
- HVAC temperature response that no longer matches cable input
Installation Notes
Verify hose size, connector count, and cable operation before installation. Confirm the valve orientation and coolant flow path match the original part on the vehicle. This heater valve is commonly searched for by drivers needing a replacement heater control valve for Honda Civic HVAC repair and other OE-style heater valve applications. Match the original opening size and non-bypass design to the removed component for proper fitment.
Quality Assurance
Four Seasons 74678 is an OE replacement heater valve from the Four Seasons Heater Valve line, built to replicate original function and connection style for HVAC temperature control service.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| No rows match your filter. | ||||