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Four Seasons 74621 HVAC Heater Control Valve
| Brand | Four Seasons 74621 |
|---|---|
| Bypass? | No |
| Description | Vacuum Closes 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 · 18 vehicles |
OE replacement. Vacuum-operated heater valve for straightforward replacement.
Non-bypass design. Controls coolant flow without a bypass circuit.
Plastic construction. Lightweight material for dependable HVAC service.
Cross-references Four Seasons 74621, TYC 2406 and 801041 for the same application. See all 13.
Four Seasons 74621 Heater Valve Overview
Four Seasons 74621 is an OE replacement HVAC heater control valve built for vacuum-operated temperature control systems. This non-bypass heater valve uses a plastic body with two hose connectors and a 0.625 in. (15.875 mm) opening for direct-fit service on select Ford trucks and SUVs.
Compatible with 2000-2005 Ford Excursion, 2000-2002 Ford Expedition, and 2000-2002 Ford F-150, this Four Seasons Heater Valve supports factory-style heater hose routing and vacuum-closes operation for the listed applications.
Key Features
- Four Seasons Heater Valve, part number 74621
- Vacuum closes non-bypass design
- OE replacement construction for factory-style service
- Plastic housing with 2 hose connectors
- 0.625 in. / 15.875 mm openings
- Direct-fit HVAC temperature control component for select Ford applications
Product Details
The Four Seasons 74621 heater control valve regulates coolant flow through the heater circuit based on vacuum signal input. Its non-bypass style is used in systems that route flow through the valve rather than around it, helping maintain proper heater performance in the original HVAC layout. This part cross-references TYC 2406 for the same application.
Use this Four Seasons Heater Valve when servicing a Ford Excursion, Ford Expedition, or Ford F-150 equipped with the listed heater valve configuration. The part number 74621 is also referenced by several OE and aftermarket numbers, making it easier to match the correct HVAC heater control valve for the vehicle.
What It Helps Fix
- No heat from the cabin heater
- Heater output stuck hot or stuck cold
- Coolant flow control issues in the heater circuit
- Vacuum-operated heater valve failure
- Leaks or cracking at the heater valve housing
Installation Notes
Verify hose size, vacuum operation, and non-bypass configuration before installation. Confirm the vehicle uses the listed heater valve application for 2000-2005 Ford Excursion, 2000-2002 Ford Expedition, or 2000-2002 Ford F-150. Inspect heater hoses, vacuum lines, and coolant condition during replacement to ensure the HVAC system operates correctly after service.
Quality Assurance
Four Seasons supplies HVAC temperature control components as OE replacement parts, and this heater valve is built to match the original application requirements for the listed Ford vehicles.
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2005 | Ford | Excursion | 6.8L | V10 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2005 | Ford | Excursion | 5.4L | V8 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2004 | Ford | Excursion | 6.8L | V10 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2004 | Ford | Excursion | 5.4L | V8 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2003 | Ford | Excursion | 6.8L | V10 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2003 | Ford | Excursion | 5.4L | V8 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2002 | Ford | Excursion | 6.8L | V10 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2002 | Ford | Excursion | 5.4L | V8 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2002 | Ford | Expedition | — | — | — | N/A | w/o Auxilary Unit; Heater Valve |
| 2002 | Ford | F-150 | — | — | — | N/A | Heater Valve |
| 2001 | Ford | Excursion | 6.8L | V10 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2001 | Ford | Excursion | 5.4L | V8 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2001 | Ford | Expedition | — | — | — | N/A | w/o Auxilary Unit; Heater Valve |
| 2001 | Ford | F-150 | — | — | — | N/A | Heater Valve |
| 2000 | Ford | Excursion | 6.8L | V10 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2000 | Ford | Excursion | 5.4L | V8 | GAS | N/A | w/o Auxilary Unit; Heater Valve |
| 2000 | Ford | Expedition | — | — | — | N/A | w/o Auxilary Unit; Heater Valve |
| 2000 | Ford | F-150 | — | — | — | N/A | Heater Valve |
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