Four Seasons 92019 HVAC Heater Core - Front

Four Seasons 92019 Heater Core Overview

Four Seasons 92019 is an aluminum HVAC heater core built for direct replacement in select GM and Saab applications. It is engineered to meet or exceed OEM requirements and is sized for the factory heater core location in compatible vehicles.

Compatible with 2003-2006 Chevrolet Trailblazer, front; 2003-2006 Chevrolet Trailblazer EXT, front; 2003-2006 GMC Envoy, front; 2003-2006 GMC Envoy XL, front; 2004-2005 GMC Envoy XUV, front; 2003-2004 Oldsmobile Bravada; 2004-2007 Buick Rainier; 2003-2008 Isuzu Ascender, front; 2005-2009 Saab 9-7x; 2007-2009 Chevrolet Trailblazer; and 2007-2009 GMC Envoy.

Key Features

• Aluminum heater core construction for HVAC heat transfer
• Core dimensions: 8-1/4 in. length, 7-1/2 in. width, and 1-1/4 in. thickness
• Tube sizes: 0.625 in. and 0.750 in.
• Meets or exceeds OEM specifications
• Direct-fit style for the factory heater core location
• Four Seasons heater core part number 92019

Detailed Product Description

Four Seasons Heater Core 92019 is part of the brand’s heater core line and is built as an aluminum heater core for vehicles that rely on a compact, efficient heat exchanger inside the HVAC case. The core material, tube sizing, and overall dimensions are matched for the listed applications, including Chevrolet Trailblazer, GMC Envoy, Buick Rainier, Isuzu Ascender, Oldsmobile Bravada, and Saab 9-7x models. This part number 92019 is a practical OE-style replacement when the original heater core is leaking, restricted, or no longer delivering consistent cabin heat.

This part cross-references APDI 9010406 and TYC 96066 for the same application.

Common Problems This Part Can Address

• Loss of cabin heat in cold weather
• Coolant odor inside the vehicle
• Sweet smell or fogging from a leaking heater core
• Restricted coolant flow through the HVAC heater circuit
• Uneven or weak defrost performance tied to poor heater output

Installation Notes and Tips

Verify the vehicle’s year, make, model, and heater core position before ordering. This heater core is listed for front and non-front applications depending on the vehicle, so match the fitment row to the exact application on the vehicle. Inspect hoses, clamps, and the HVAC case during replacement, and flush the cooling system if contamination or debris is present. Confirm tube orientation and dimensions against the original unit before installation.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements, supporting a replacement that follows factory-level dimensional and performance expectations for the specified applications.