Four Seasons 91752 HVAC Heater Core

Four Seasons 91752 Heater Core Overview

The Four Seasons Heater Core 91752 is a copper/brass HVAC heater core built to match the original equipment style for select Mazda trucks. With copper core material and OEM-level dimensions, it supports proper cabin heat transfer in applications that require a direct-fit replacement.

Compatible with 1986-1987 Mazda B2000, 1987-1993 Mazda B2200, and 1987-1993 Mazda B2600 heater core applications, this part is sized for the factory HVAC case and tube layout.

Key Features

• Brand: Four Seasons Heater Core
• Part number: 91752
• Copper/brass heater core construction
• Copper core material for heat exchange performance
• Dimensions: 5-3/8 in. length, 7-1/8 in. width, 1-1/8 in. thickness
• Tube size: 5/8 in. inlet and 5/8 in. outlet
• Meets or exceeds OEM requirements
• Direct-fit style for select Mazda B-series heater core replacement

Product Details

Four Seasons 91752 is a heater core from the Four Seasons Heater Core line, engineered as a copper/brass replacement for HVAC systems that use this compact core size. The unit measures 5.375 inches high, 7.125 inches wide, and 1.125 inches deep, with 0.625-inch tubes on both connections. Its fixed pipe positioning and OE-style dimensions help it align with the factory heater box in the listed Mazda B2000, B2200, and B2600 applications.

This part cross-references APDI 9010230 and Gates 2700 for the same application.

Common Problems This Part Can Address

• Weak or inconsistent cabin heat
• Coolant seepage from a damaged heater core
• Restricted coolant flow through the HVAC heater circuit
• Fogging or moisture caused by heater core leakage
• Loss of heat output in Mazda B2000, B2200, or B2600 heater systems

Installation Notes and Tips

Verify the heater core dimensions, tube diameter, and pipe orientation against the original unit before installation. Because this part uses fixed pipe positioning, confirm the HVAC case and hose routing match the factory layout on the vehicle. Proper cooling system draining, flushing, and refill procedures should be followed during replacement to help remove debris and trapped air.

Fits 1986-1987 Mazda B2000, N/A. Fits 1987-1993 Mazda B2200, N/A. Fits 1987-1993 Mazda B2600, N/A.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements, making it a technical replacement option for factory-style HVAC service on the specified Mazda models.