Four Seasons 90049 HVAC Heater Core

Four Seasons 90049 Heater Core Overview

The Four Seasons 90049 heater core is an aluminum HVAC heater core built for direct replacement service in select Buick and Oldsmobile applications. It is engineered to meet or exceed OEM requirements and is sized for a precise fit in the heater case.

Compatible with 1995-1999 Buick Riviera and 1995-1999 Oldsmobile Aurora, this heater core supports dependable cabin heat performance when the original core is leaking, restricted, or no longer transferring heat efficiently.

Key Features

• Brand: Four Seasons Heater Core
• Part number: 90049
• Aluminum core construction for HVAC service
• Core dimensions: 10-3/8 in. length, 6-1/4 in. width, 1 in. thickness
• Core height: 10.375 in.; core width: 6.250 in.; core depth: 1.000 in.
• Tube sizes: 0.625 in. and 0.750 in.
• Meets or exceeds OEM specifications
• Direct-fit style for heater core replacement

Product Details

Four Seasons 90049 is an aluminum heater core designed for HVAC systems that require accurate dimensions and reliable heat transfer. The aluminum core material helps support efficient coolant-to-air heat exchange inside the heater case, while the listed tube sizes and fixed pipe positioning help maintain proper routing during replacement. This part cross-references APDI 9010256 for the same application.

For buyers searching for a 1995-1999 Buick Riviera heater core or a 1995-1999 Oldsmobile Aurora heater core, this part number 90049 provides a focused replacement option with OE-level dimensional targets. It is also a practical choice when replacing a leaking heater core, restoring weak cabin heat, or correcting coolant odor inside the vehicle.

Common Problems This Part Can Address

• Coolant leaking into the HVAC housing
• Weak or uneven cabin heat output
• Restricted coolant flow through the heater circuit
• Fogging or sweet coolant odor inside the cabin
• Heat loss caused by a corroded or damaged heater core

Installation Notes and Tips

Verify heater case dimensions, tube orientation, and hose routing before installation. Drain the cooling system, inspect related hoses and clamps, and flush the heater circuit if contamination or scale is present. After installation, refill the cooling system with the correct coolant mixture and bleed air from the system according to the vehicle service procedure.

Because heater core replacement often requires access through the HVAC housing, compare the removed part to the Four Seasons 90049 before final assembly. Confirm fitment for Buick Riviera and Oldsmobile Aurora applications by model year and HVAC configuration.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM specifications, supporting a replacement standard aligned with original equipment requirements. The Four Seasons 90049 is built for consistent fit and function in the specified Buick and Oldsmobile applications.