Four Seasons 90039 HVAC Heater Core

Four Seasons 90039 Heater Core for Toyota RAV4

The Four Seasons Heater Core 90039 is an aluminum HVAC heater core built for 2001-2006 Toyota RAV4 applications. It is an OE-style replacement that meets or exceeds OEM requirements and is sized for direct-fit service in the vehicle’s heating system.

Key Features

• Brand: Four Seasons Heater Core
• Part number: 90039
• Core material: Aluminum
• Core dimensions: 8-5/8 in. height, 5-1/2 in. width, 1-3/8 in. depth
• Tube size: 0.625 in. / 15.875 mm on both connections
• Meets or exceeds OEM specifications
• Direct replacement for 2001-2006 Toyota RAV4 heater core service

Product Details

Four Seasons 90039 is part of the Heater Core product line, focused on HVAC core replacement for passenger vehicles. This aluminum heater core is engineered around the listed dimensions and tube sizing to match the original heating circuit layout in the Toyota RAV4. If you are searching for a Toyota RAV4 heater core replacement, a Four Seasons 90039 heater core, or an aluminum HVAC heater core for 2001-2006 Toyota RAV4 models, this part provides the correct fitment reference for the application.

This part cross-references Spectra Premium 93039 and UAC HT2023C for the same application.

What It Helps Fix

• Loss of cabin heat
• Coolant odor inside the vehicle
• Sweet-smelling vapor from the HVAC vents
• Coolant seepage at the heater core assembly
• Uneven or weak heater output in the Toyota RAV4

Installation Notes

Fits 2001-2006 Toyota RAV4, N/A. Verify tube orientation, core dimensions, and hose connection size before installation. Drain the cooling system, inspect related hoses and seals, and confirm the HVAC case is clean before installing the replacement heater core. Proper bleeding of the cooling system after service helps restore normal heater performance.

Quality Assurance

Four Seasons lists this heater core as meeting or exceeding OEM requirements. The aluminum construction and application-specific sizing support consistent replacement quality for HVAC repair work on the Toyota RAV4.