Four Seasons 91801 HVAC Heater Core

Overview of Four Seasons Heater Core 91801

The Four Seasons Heater Core 91801 is designed to provide reliable heating performance for select Lexus and Toyota vehicles. Engineered with durable aluminum construction, this heater core ensures efficient heat transfer and long-lasting operation for models like the Toyota Camry, Avalon, and Lexus ES300.

• Core dimensions: 8-1/2 inches length, 6-1/2 inches width, 1-1/4 inches thickness
• Constructed from corrosion-resistant aluminum material
• Tube diameter: 0.625 inches (15.875 mm) for both inlet and outlet
• Meets or exceeds OEM specifications for fit and function
• Designed specifically for HVAC heater core applications

Four Seasons Heater Core Product Line Details

The Four Seasons Heater Core line focuses on delivering replacement heater cores that match or exceed original equipment manufacturer standards. This aluminum heater core model 91801 is part of that line, offering consistent heating performance and durability. The product line emphasizes precise fitment and quality materials to ensure compatibility with HVAC systems in Lexus and Toyota vehicles.

Product Description and Specifications

This HVAC heater core features an aluminum core measuring 8.5 inches in height, 6.5 inches in width, and 1.25 inches in depth. The core’s aluminum construction provides effective heat conduction while resisting corrosion over time. Both inlet and outlet tubes have a diameter of 0.625 inches (15.875 mm), designed for direct replacement without modification. The heater core does not include adjustable pipe positioning, maintaining OEM-style installation requirements. This part is engineered to fit the heating systems of Lexus ES300 and Toyota Avalon and Camry models, ensuring proper integration with existing HVAC components.

Common Applications and Issues Addressed

• Restores heating function in Lexus ES300, Toyota Avalon, and Camry vehicles
• Replaces leaking or clogged heater cores causing coolant loss
• Eliminates insufficient cabin heat due to core blockages or corrosion
• Resolves heater core-related HVAC system malfunctions
• Prevents engine overheating caused by compromised heater core performance

Installation Notes and Tips

• Ensure compatibility with vehicle make and model before installation
• Drain coolant system prior to heater core removal to avoid spills
• Handle aluminum core carefully to prevent damage to fins and tubes
• Verify hose connections match 0.625 inch tube diameters for proper fit
• Bleed cooling system after installation to remove air pockets

Quality Assurance and Warranty

The Four Seasons Heater Core 91801 meets or exceeds OEM standards for quality and fitment. Manufactured with corrosion-resistant aluminum, this heater core is built for durability and reliable heating performance. While specific warranty details may vary, Four Seasons products typically include a limited warranty covering defects in materials and workmanship to provide confidence in your replacement part.