Four Seasons 90037 HVAC Heater Core

Four Seasons 90037 Heater Core for Toyota Celica

The Four Seasons 90037 heater core is an aluminum HVAC heater core built for direct replacement service in select Toyota Celica models. With OE-matching dimensions and confirmed fitment for 2000-2005 Toyota Celica applications, it supports proper cabin heat output and factory-style HVAC performance.

Key Features

• Brand: Four Seasons Heater Core line
• Part number: 90037
• Aluminum heater core construction
• Core dimensions: 5-1/2 in. length, 8-3/4 in. width, 1 in. thickness
• Core height: 5.500 in.; core depth: 1.000 in.
• Tube size: 0.750 in. / 19.050 mm on both connections
• Meets or exceeds OEM requirements
• Fixed pipe positioning

Product Details

Four Seasons 90037 is part of the Heater Core product line, focused on replacement HVAC core service with application-specific sizing and aluminum construction. This heater core is built to match the original layout used in the Toyota Celica heating system, helping restore heat transfer through the HVAC case without changing the factory configuration. It cross-references Dayco 93037 for the same application.

Fits 2000 Toyota Celica, N/A; Heater Core. Fits 2001-2005 Toyota Celica, N/A; Heater Core. The Four Seasons 90037 heater core is a direct-fit option for Toyota Celica owners replacing a leaking, restricted, or inefficient heater core.

Common Problems This Part Can Address

• Weak or uneven cabin heat
• Coolant odor inside the vehicle
• Interior fogging caused by heater core leakage
• Loss of heater performance from internal blockage
• Coolant seepage within the HVAC housing

Installation Notes and Tips

Verify the vehicle year and heater core dimensions before installation, especially on 2000 Toyota Celica models built from 8/99. Confirm tube orientation and HVAC case access before removing the original unit. Because this part uses fixed pipe positioning, match the factory routing during installation for proper fitment in the Toyota Celica heater box.

Quality Assurance

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