Four Seasons 74004 HVAC Heater Control Valve

Four Seasons 74004 Heater Valve

The Four Seasons Heater Valve 74004 is an OE replacement HVAC heater control valve for cable-operated temperature control systems. It uses a pull-to-close, non-bypass design with two hose connectors and a 0.625 in. opening for direct coolant flow control.

Compatible with 1994-1999 Toyota Celica heater valve applications, this Four Seasons heater valve is built for vehicles that use cable actuation rather than vacuum or electronic control. The plastic construction and OE-style configuration support straightforward replacement of the original heater control valve on the Toyota Celica.

Key Features

• Part number: 74004
• Four Seasons Heater Valve product line
• Cable operated pull to close design
• Non-bypass style heater valve
• Two hose connectors
• 0.625 in. opening size
• Plastic construction
• OE replacement heater control valve

Product Details

Four Seasons 74004 is an HVAC heater control valve used to regulate coolant flow through the heater core in cable-operated systems. The non-bypass layout means the valve controls flow without routing coolant around the heater circuit, which matches the original configuration on supported applications. For buyers searching for a 1994 Toyota Celica heater valve, 1995-1999 Toyota Celica heater control valve, or a Four Seasons 74004 OE replacement, this part is built around the original fit and function.

This part cross-references Perfection 800017 for the same application.

Common Problems This Part Can Address

• Heater output stuck on hot or cold
• Coolant flow not responding to cable movement
• Broken or leaking heater control valve housing
• Restricted heater core coolant control
• Loss of cabin temperature adjustment on Toyota Celica models

Installation Notes and Tips

Verify cable operation, hose routing, and connector size before installation. Match the valve orientation to the original heater circuit and confirm the 0.625 in. openings align with the existing hoses. After installation, check for coolant leaks and confirm smooth temperature control through the full range of the HVAC lever.

Quality Assurance

Four Seasons supplies OE replacement HVAC components, and this heater valve is built to match the original cable-operated, non-bypass application used on supported Toyota Celica models.