Four Seasons 74804 HVAC Heater Control Valve

Overview of Four Seasons Heater Valve 74804

The Four Seasons Heater Valve 74804 is designed to regulate the flow of coolant in your vehicle's heating system. Specifically engineered for Cadillac Eldorado and Seville models, this HVAC heater control valve ensures precise temperature control by vacuum operation.

• OEM replacement part number 74804
• Vacuum-operated non-bypass heater valve
• Constructed from durable plastic material
• Equipped with three hose connectors for secure fitment
• Compatible with Cadillac Eldorado and Seville models
• Standard opening sizes: 0.750 inch (19.05 mm) and 0.625 inch (15.875 mm)

Detailed Product Description

The Four Seasons Heater Valve 74804 belongs to the Heater Valve product line, which focuses on reliable HVAC temperature control components. This particular valve operates using vacuum pressure to close the non-bypass heater valve, effectively controlling coolant flow to the heater core. Made from plastic, it features three hose connectors with precise opening dimensions—0.750 inch (19.05 mm) for openings B, C, and the main opening, and 0.625 inch (15.875 mm) for opening D—ensuring compatibility with the original equipment specifications. This part is an exact OEM replacement, designed to maintain the factory performance of your Cadillac Eldorado or Seville heating system.

Common Applications and Issues Addressed

• Restores proper heater core coolant flow control
• Resolves heater valve leaks or failures
• Eliminates inconsistent cabin heating problems
• Prevents vacuum-related heater valve malfunctions
• Replaces worn or damaged original heater valves

Installation Notes and Tips

• Ensure vacuum lines are properly connected to maintain valve operation
• Verify hose connector sizes match original equipment for a secure fit
• Inspect surrounding HVAC components for wear during installation
• Follow vehicle-specific service manual instructions for removal and installation

Quality Assurance and Warranty

Four Seasons provides this heater valve as a direct OEM replacement, meeting original equipment standards for fit, form, and function. Manufactured with quality plastic materials and tested for vacuum operation reliability, part number 74804 is backed by Four Seasons' commitment to durability and performance. Please refer to Four Seasons' warranty policy for specific coverage details.