Four Seasons 91512 HVAC Heater Core

Four Seasons 91512 Heater Core Overview

The Four Seasons 91512 heater core is a copper/brass HVAC heater core built for vehicles equipped with air conditioning. It is a direct-fit replacement for select Buick and Oldsmobile applications, including the 1970 Buick LeSabre and 1969-1970 Oldsmobile 98 and Delta 88. With OEM-level dimensions and copper core construction, this heater core supports reliable cabin heat transfer in classic GM HVAC systems.

Four Seasons Heater Core line components are built for replacement use in heating and cooling service, with this part meeting or exceeding OEM requirements. The 91512 heater core is sized at 8.000 inches high, 8.625 inches wide, and 2.000 inches deep, with 0.625-inch and 0.750-inch tube connections for the listed applications.

Key Features

• Copper/brass heater core construction
• Core material: copper
• Dimensions: 8.000 in. height, 8.625 in. width, 2.000 in. depth
• Tube sizes: 0.625 in. and 0.750 in.
• Meets or exceeds OEM requirements
• Compatible with vehicles equipped with air conditioning
• Four Seasons part number 91512

Detailed Description

Four Seasons 91512 is an HVAC heater core designed for classic GM fitments where accurate sizing and dependable heat exchange matter. The copper/brass style helps maintain efficient coolant-to-air heat transfer inside the HVAC case, while the listed dimensions and tube diameters support proper installation in the specified Buick and Oldsmobile models. This part cross-references Edelmann 91512 for the same application.

Fits 1970 Buick LeSabre, N/A. Fits 1969-1970 Oldsmobile 98, N/A. Fits 1969-1970 Oldsmobile Delta 88, N/A. For buyers searching for a 1970 Buick LeSabre heater core or a 1969-1970 Oldsmobile 98 heater core, the Four Seasons 91512 provides the specified replacement format for these air-conditioned vehicles.

Common Problems This Part Can Address

• Weak or uneven cabin heat output
• Coolant seepage inside the HVAC housing
• Restricted heat transfer from a corroded core
• Replacement needs after heater core leakage
• Fitment issues when restoring original HVAC performance

Installation Notes and Tips

Verify the existing heater core dimensions, tube sizes, and HVAC case layout before installation. Confirm that the vehicle is equipped with air conditioning, since the listed fitment applies to those configurations. Inspect hoses, clamps, and the surrounding HVAC components during service so the replacement core can be installed into a clean, leak-free system.

Quality Assurance

This heater core meets or exceeds OEM requirements and is part of Four Seasons’ heater core product line for HVAC service applications. Confirm fitment against the vehicle’s original heater core specifications before installation.