Four Seasons 90040 HVAC Heater Core

Four Seasons 90040 Heater Core for Corolla

The Four Seasons 90040 is an aluminum HVAC heater core built for direct replacement service in select Toyota Corolla models. It is sized to match the listed application and meets or exceeds OEM requirements for the 1998-2002 Toyota Corolla heater core fitment.

Key Features

• Aluminum heater core construction
• Core dimensions: 5 in. height, 8-3/4 in. width, 1 in. depth
• Tube size: 0.625 in. / 15.875 mm on both connections
• Meets or exceeds OEM specifications
• Fixed pipe positioning; no adjustable pipe positioning
• Four Seasons heater core part number 90040

Product Details

Four Seasons 90040 is a heater core / aluminum assembly designed for HVAC repair where the original core has leaked, restricted coolant flow, or lost heat transfer efficiency. The aluminum core material supports efficient thermal transfer in a compact package, and the listed dimensions help confirm proper fit in the Toyota Corolla HVAC case. This part cross-references Spectra Premium 98040 for the same application.

Compatible With 1998-2002 Toyota Corolla, heater core application. The Four Seasons heater core line focuses on replacement HVAC components built to match OE-style fit and function, and 90040 follows that approach for Corolla service work.

Common Repair Symptoms

• Weak or inconsistent cabin heat
• Coolant odor inside the vehicle
• Fogging or film on the windshield from heater core leakage
• Coolant loss with no obvious external leak
• Restricted heater performance from internal blockage

Installation Notes

Verify core height, width, depth, and tube diameter before installation. Confirm the heater hoses and HVAC case connections match the fixed pipe layout, since adjustable pipe positioning is not provided. Proper coolant system bleeding is important after replacement to help restore normal heater operation in the Corolla.

Quality Assurance

This Four Seasons heater core is listed as meeting or exceeding OEM requirements for the specified application. Use the confirmed fitment data for 1998-2002 Toyota Corolla heater core replacement service, and compare the part number 90040 against the existing unit before installation.