Four Seasons 91509 HVAC Heater Core

Reliable Heater Core Replacement for Select GM Vehicles

The Four Seasons Heater Core 91509 is designed to restore efficient heating performance in your Cadillac, Chevrolet, Oldsmobile, or Pontiac. Engineered with durable copper and brass materials, this heater core ensures consistent heat transfer and long-lasting operation for models like the Nova, Omega, Phoenix, and Seville.

• Core dimensions: 7-3/4 inches length, 6 inches width, 1-7/8 inches thickness
• Constructed from copper/brass for enhanced heat conductivity
• Core depth of 1.875 inches and height of 7.750 inches
• Tube sizes: 0.625 inch (15.875 mm) and 0.750 inch (19.050 mm)
• Meets or exceeds OEM specifications for reliable fit and function

Four Seasons Heater Core Product Line Overview

The Four Seasons Heater Core line focuses on providing high-quality HVAC heater cores that meet or exceed original equipment manufacturer standards. The 91509 part number is part of this line, offering a copper/brass core style that balances durability and efficient heat transfer. This product line is tailored to support proper heating system operation in various GM vehicles, ensuring compatibility and performance.

Detailed Product Description

This HVAC heater core features a copper core material known for its excellent thermal conductivity and corrosion resistance. The 7-3/4 inch length and 6 inch width dimensions make it suitable for specific GM models including Cadillac Seville and Chevrolet Nova. The heater core’s tubes measure 0.625 inch and 0.750 inch, accommodating the vehicle’s coolant flow requirements. The fixed pipe positioning design simplifies installation without the need for adjustments. Four Seasons 91509 is engineered to meet or exceed OEM standards, providing a dependable replacement that maintains your vehicle’s heating efficiency.

Common Applications and Issues Addressed

• Restores heating performance in Cadillac Seville, Chevrolet Nova, Oldsmobile Omega, and Pontiac Phoenix
• Resolves heater core leaks causing coolant loss or interior fogging
• Eliminates insufficient cabin heat due to clogged or damaged cores
• Prevents overheating issues related to faulty heater cores
• Addresses corrosion and wear in aging HVAC systems

Installation Notes and Tips

When installing the Four Seasons Heater Core 91509, ensure compatibility with your vehicle’s make and model, specifically Cadillac, Chevrolet, Oldsmobile, or Pontiac models listed. The fixed pipe positioning requires careful alignment during installation. It is recommended to flush the cooling system before installation to prevent contamination. Proper sealing and hose connections are essential to avoid leaks and maintain system pressure.

Quality Assurance and Warranty

Four Seasons heater cores are manufactured to meet or exceed OEM specifications, ensuring reliable performance and durability. The 91509 heater core undergoes quality control testing to verify fitment and function. While specific warranty details are not provided, Four Seasons products typically come with a limited warranty covering defects in materials and workmanship.