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Four Seasons 74614 HVAC Heater Control Valve
| Brand | Four Seasons 74614 |
|---|---|
| Bypass? | No |
| Description | Vacuum Open Non-Bypass Heater Valve |
| Hose Connector Quantity | 2 Connectors |
| Material | Plastic |
| O.E. Replacement? | Yes |
| Opening B IN | 0.625 |
| Opening B MM | 15.875 |
| Opening IN | 0.625 |
| Opening MM | 15.875 |
| Operation Type | Vacuum |
| Style | Non-Bypass |
| Type | Heater Valves |
| Product line | Heater Valve |
| Fits | Ford and Mercury · 16 vehicles |
OE replacement. Direct-fit heater valve for straightforward installation.
Vacuum open design. Responds to vacuum control for reliable coolant flow.
Non-bypass style. Helps route coolant through the heater circuit as intended.
Cross-references Bremi 30400, Eastern Catalytic 20415 and Four Seasons 74614 for the same application. See all 22.
Four Seasons 74614 Heater Valve Overview
Four Seasons 74614 is a vacuum open, non-bypass HVAC heater control valve built as an OE replacement for select Ford and Mercury applications. It uses a plastic body with two hose connectors and a 0.625 in. (15.875 mm) opening for direct-fit heater circuit service.
The Four Seasons Heater Valve line focuses on replacement parts that match original system operation. This 74614 heater valve is specified for vacuum operation and non-bypass routing, making it a practical choice when restoring heater control on vehicles such as the Ford Escort, Ford Tempo, Mercury Lynx, Mercury Topaz, and Mercury LN7.
Key Features
- Vacuum open heater control valve for HVAC temperature regulation
- Non-bypass style with two hose connectors
- Plastic construction
- OE replacement design
- 0.625 in. / 15.875 mm opening size
- Four Seasons 74614 part number for catalog matching
Detailed Description
This HVAC heater control valve regulates coolant flow through the heater circuit based on vacuum signal from the vehicle’s climate control system. Four Seasons 74614 is a non-bypass valve, meaning it is configured for systems that route coolant through the heater core without a bypass path in the valve body. That makes it important to match the original system layout before replacement.
Compatible With 1981-1985 Ford Escort, 1984-1985 Ford Tempo with High Capacity Dual Core, 1981-1985 Mercury Lynx with Dual Capacity Htr Core, 1984-1985 Mercury Topaz with Dealer Air and Dual Capacity Htr Core, and 1982-1983 Mercury LN7 with Dual Capacity Htr Core. The Four Seasons 74614 heater valve is also listed for 1984-1985 Ford Escort with High Capacity Dual Core.
This part cross-references UAC HV1021C for the same application.
Common Issues This Part Can Address
- No heat or inconsistent cabin heat control
- Coolant flow not responding to vacuum-actuated HVAC commands
- Heater output stuck on or stuck off
- Leaking or deteriorated heater valve housing
- Incorrect heater circuit routing after valve failure
Installation Notes and Tips
Verify the vehicle uses a vacuum open, non-bypass heater valve before ordering. Confirm hose size, connector count, and opening dimensions against the original part, especially on Ford Escort and Mercury Topaz applications with dual-capacity or high-capacity heater cores. Inspect vacuum supply lines and heater hoses during installation so the new valve can operate correctly.
Quality Assurance
Four Seasons supplies HVAC replacement components for OE-style service applications, and this heater valve is listed as an OE replacement part. Use the part number 74614 to confirm catalog fitment and system match before installation.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1985 | Ford | Escort | — | — | N/A | Heater Valve |
| 1985 | Ford | Tempo | — | — | N/A | w/ High Capacity Dual Core; Heater Valve |
| 1985 | Mercury | Lynx | — | — | N/A | Dual Capacity Htr Core; Heater Valve |
| 1985 | Mercury | Topaz | — | — | N/A | Dealer Air; Dual Capacity Htr Core; Heater Valve |
| 1984 | Ford | Escort | 2.0L | L4 | N/A | w/ High Capacity Dual Core; Heater Valve |
| 1984 | Ford | Tempo | 2.0L | L4 | N/A | w/ High Capacity Dual Core; Heater Valve |
| 1984 | Mercury | Lynx | — | — | N/A | Dual Capacity Htr Core; Heater Valve |
| 1984 | Mercury | Topaz | — | — | N/A | Dealer Air; Dual Capacity Htr Core; Heater Valve |
| 1983 | Ford | Escort | — | — | N/A | Heater Valve |
| 1983 | Mercury | LN7 | — | — | N/A | Dual Capacity Htr Core; Heater Valve |
| 1983 | Mercury | Lynx | — | — | N/A | Dual Capacity Htr Core; Heater Valve |
| 1982 | Ford | Escort | — | — | N/A | Heater Valve |
| 1982 | Mercury | LN7 | — | — | N/A | Dual Capacity Htr Core; Heater Valve |
| 1982 | Mercury | Lynx | — | — | N/A | Dual Capacity Htr Core; Heater Valve |
| 1981 | Ford | Escort | — | — | N/A | Heater Valve |
| 1981 | Mercury | Lynx | — | — | N/A | Dual Capacity Htr Core; Heater Valve |
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