Four Seasons 91719 HVAC Heater Core

Four Seasons 91719 Heater Core Overview

The Four Seasons 91719 heater core is a copper/brass HVAC heater core built to meet or exceed OEM requirements. With a 9-3/4 inch core height, 7-3/4 inch core width, and 2 inch depth, it is sized for direct replacement service in the heating system.

Four Seasons Heater Core parts are built for repair work that demands accurate dimensions and dependable heat transfer. This heater core uses a copper core material and fixed pipe positioning for a straightforward replacement in the HVAC system.

Key Features

• Part number: 91719
• Copper/brass heater core construction
• Copper core material for thermal conductivity
• Core dimensions: 9-3/4 in. height, 7-3/4 in. width, 2 in. depth
• Tube sizes: 0.625 in. and 0.750 in.
• Meets or exceeds OEM specifications
• Fixed pipe positioning; adjustable pipe positioning: No

Detailed Description

The Four Seasons 91719 heater core is an HVAC heater core designed around copper/brass construction for service replacement in the vehicle heating system. Its 9.750 inch core height, 7.750 inch core width, and 2.000 inch core depth provide the dimensional profile needed for applications that require this exact size. The copper core material supports efficient heat transfer through the heater circuit, while the fixed tube layout helps maintain proper hose and case alignment during replacement. This part cross-references APDI 9010182 for the same application.

For buyers searching for a heater core for Ford, Chevrolet, or Dodge applications, the Four Seasons 91719 offers an OEM-style replacement option with the listed tube diameters and copper/brass style construction. Use the part number 91719 when matching the heater core to the vehicle HVAC case and hose connections.

Common Problems This Part Can Address

• Loss of cabin heat from a restricted or leaking heater core
• Coolant odor inside the passenger compartment
• Fogging or film on the inside of the windshield caused by heater core leakage
• Uneven or weak heat output from the HVAC system
• Coolant seepage at the heater core connections

Installation Notes and Tips

Verify core height, width, depth, and tube diameters before installation to confirm the heater core matches the HVAC case and hose routing. Inspect the heater hoses, clamps, and coolant condition during replacement, and flush the cooling system if contamination or debris is present. Confirm the tube orientation and pipe position against the original unit before final assembly.

For fitment-based searches, this heater core is commonly referenced for vehicle HVAC repair work on Ford, Chevrolet, and Dodge models where the 91719 application matches the original dimensions and connection style.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM specifications. The Four Seasons Heater Core line is built for replacement service where accurate fit, copper/brass construction, and consistent heat transfer are required. Part number 91719 is also referenced by Nissens 94719 and other cross-reference numbers for the same application.