Four Seasons 90053 HVAC Heater Core

Four Seasons 90053 Heater Core Overview

Four Seasons 90053 is an aluminum HVAC heater core built for direct replacement service in select Buick, Pontiac, and Oldsmobile applications. With OEM-matching dimensions and aluminum core construction, it supports proper cabin heat transfer for vehicles that need a dependable heater core replacement.

This Four Seasons Heater Core line focuses on accurate fit and OE-style construction for service work on the 2000-2005 Buick LeSabre, 2000-2005 Pontiac Bonneville, and 2001-2003 Oldsmobile Aurora. The Four Seasons 90053 is a practical choice when restoring heater performance in these platforms.

Key Features

• Part number: 90053
• Aluminum heater core construction
• Core material: aluminum
• Meets or exceeds OEM requirements
• Core dimensions: 10-1/2 in. length, 6-3/8 in. width, 1 in. thickness
• Core height: 10.500 in.; core width: 6.375 in.; core depth: 1.000 in.
• Tube sizes: 0.625 in. and 0.750 in.
• Adjustable pipe positioning: No

Detailed Description

Four Seasons 90053 is an aluminum HVAC heater core designed around the dimensions and connection sizes needed for listed vehicle applications. The aluminum core style supports efficient heat exchange inside the HVAC case, while the OE-style sizing helps maintain proper fit during replacement service. For buyers searching for a heater core for 2000-2005 Buick LeSabre, 2000-2005 Pontiac Bonneville, or 2001-2003 Oldsmobile Aurora, this part number provides a direct-reference option with confirmed fitment.

This part cross-references APDI 9010282 and UAC HT394212C for the same application.

What It Helps Address

• Weak or inconsistent cabin heat
• Coolant odor inside the passenger compartment
• Leaking heater core symptoms
• Restricted heat output from a clogged core
• HVAC performance loss in Buick LeSabre, Pontiac Bonneville, and Oldsmobile Aurora models

Installation Notes and Tips

Verify the existing heater core dimensions, tube sizes, and pipe orientation before installation. Because adjustable pipe positioning is not included, confirm the replacement matches the original routing in the HVAC case. Proper cooling system service, including coolant inspection and system bleeding after installation, helps ensure the new heater core operates correctly.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements, making it a specification-based replacement for service technicians and vehicle owners who need a correct-fit HVAC heater core.

• Fits 2000-2005 Buick LeSabre, Heater Core
• Fits 2000-2005 Pontiac Bonneville, Heater Core
• Fits 2001-2003 Oldsmobile Aurora, Heater Core