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Four Seasons 74607 HVAC Heater Control Valve - Front
| Brand | Four Seasons 74607 |
|---|---|
| Position | Front |
| Bypass? | Yes |
| Description | Vacuum Closes Non-Bypass Heater Valve |
| Hose Connector Quantity | 4 Connectors |
| Material | Plastic |
| O.E. Replacement? | Yes |
| Opening B IN | 0.750 |
| Opening C IN | 0.750 |
| Opening D IN | 0.750 |
| Opening IN | 0.750 |
| Operation Type | Vacuum |
| Style | Non-Bypass |
| Type | Heater Valves |
| Product line | Heater Valve |
| Fits | Chevrolet and GMC · 12 vehicles |
OE replacement. Direct-fit heater valve for straightforward installation.
Vacuum-operated. Responds to vacuum control for precise coolant flow.
Non-bypass design. Helps regulate heater circuit flow without bypassing.
Cross-references Four Seasons 74607, 155543 and 277633 for the same application. See all 12.
Four Seasons 74607 Heater Valve
The Four Seasons 74607 is an OE replacement HVAC heater control valve for vacuum-operated heating systems. It uses a non-bypass design with four hose connectors and 0.750 in. openings to regulate coolant flow through the heater circuit.
Compatible with select Chevrolet Astro and GMC Safari front heater valve applications, this Four Seasons Heater Valve supports direct replacement service for vacuum-closing systems. The Four Seasons 74607 is built in plastic and matches the original-style layout for the listed vehicles.
Key Features
- Vacuum-operated heater control valve
- Non-bypass style with bypass function noted
- OE replacement for factory-style service
- Plastic construction
- Four hose connectors
- 0.750 in. openings on all listed ports
Product Details
This HVAC heater control valve is used to control coolant flow through the heater core based on vacuum signal. The vacuum-closing design helps restore proper heater operation in vehicles that use a non-bypass valve arrangement. Part number 74607 is a direct-fit style replacement for the specified front heater valve applications on Chevrolet Astro and GMC Safari models.
This part cross-references ACDelco 155543 and 277633 for the same application.
Common Issues It May Resolve
- No heat from the HVAC system
- Heater stuck on constant heat
- Coolant flow not switching correctly through the heater core
- Vacuum-controlled heater valve failure
- Leaking or cracked original heater valve housing
Installation Notes
- Fits 1990-1995 Chevrolet Astro, front.
- Fits 1990-1995 GMC Safari, front.
- Verify hose routing, connector count, and vacuum operation before installation.
- Confirm the vehicle uses a non-bypass heater valve with 0.750 in. openings.
- Match the original valve orientation and vacuum connection layout to the factory part.
Quality Assurance
Four Seasons Heater Valve parts are OE replacement components built for factory-style HVAC service. Part number 74607 is listed for the specified Chevrolet Astro and GMC Safari applications.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| 1995 | Chevrolet | Astro | Front | Valve; Heater Valve |
| 1995 | GMC | Safari | Front | Valve; Heater Valve |
| 1994 | Chevrolet | Astro | Front | Valve; Heater Valve |
| 1994 | GMC | Safari | Front | Valve; Heater Valve |
| 1993 | Chevrolet | Astro | Front | Valve; Heater Valve |
| 1993 | GMC | Safari | Front | Valve; Heater Valve |
| 1992 | Chevrolet | Astro | Front | Valve; Heater Valve |
| 1992 | GMC | Safari | Front | Valve; Heater Valve |
| 1991 | Chevrolet | Astro | Front | Valve; Heater Valve |
| 1991 | GMC | Safari | Front | Valve; Heater Valve |
| 1990 | Chevrolet | Astro | Front | Valve; Heater Valve |
| 1990 | GMC | Safari | Front | Heater Valve |
| No rows match your filter. | ||||