Four Seasons 91541 HVAC Heater Core

Reliable Heater Core Replacement for Buick, Cadillac, and Oldsmobile

The Four Seasons Heater Core 91541 is designed to restore efficient heating performance in select Buick, Cadillac, and Oldsmobile vehicles. Engineered with durable copper and brass materials, this heater core ensures consistent heat transfer and long-lasting operation.

• Core dimensions: 8-1/4 inches length, 8-5/8 inches width, 2-1/2 inches thickness
• Constructed from copper/brass for enhanced thermal conductivity
• Meets or exceeds OEM specifications for reliable fit and function
• Includes two tubes: 0.625 inch and 0.750 inch diameter for proper coolant flow
• Compatible with Buick Commercial Chassis, Cadillac DeVille, Eldorado, Fleetwood, Riviera, and Oldsmobile Toronado models

Four Seasons Heater Core Product Line Overview

The Four Seasons Heater Core line focuses on delivering replacement cores that match or exceed original equipment standards. The Heater Core 91541 is part of this line, offering a copper/brass construction that provides durability and efficient heat transfer. This product line is tailored to meet the specific requirements of various vehicle makes and models, ensuring proper fitment and performance.

Detailed Product Description

This HVAC heater core features a core height of 8.250 inches, width of 8.625 inches, and a depth of 2.500 inches, making it suitable for precise fitment in designated vehicle models. The copper core material enhances heat exchange efficiency, while the brass components contribute to corrosion resistance. The heater core does not include adjustable pipe positioning, maintaining OEM-style installation. Tubes measuring 0.625 inch and 0.750 inch in diameter facilitate proper coolant circulation through the core.

Common Applications and Issues Addressed

• Restores heating system performance in Buick Commercial Chassis and Cadillac DeVille models
• Replaces leaking or clogged heater cores in Cadillac Eldorado and Fleetwood vehicles
• Solves insufficient cabin heat problems in Oldsmobile Toronado and Riviera models
• Addresses coolant leaks inside the passenger compartment
• Eliminates heater core blockages that reduce heat output

Installation Notes and Tips

Installation of the Four Seasons Heater Core 91541 requires removal of the HVAC housing to access the core. Ensure all coolant is drained before removal to prevent spills. Verify tube diameters and core dimensions match the vehicle’s specifications for proper fit. Since this heater core does not have adjustable pipe positioning, alignment with existing hoses is critical. Follow vehicle-specific service manuals for detailed installation procedures.

Quality Assurance and Warranty

The Four Seasons Heater Core 91541 meets or exceeds OEM standards, providing reliable performance and durability. Manufactured with high-quality copper and brass materials, this heater core is designed for long service life. While specific warranty details are not provided, Four Seasons products typically come with a limited warranty against defects in materials and workmanship.