Four Seasons 90490 HVAC Heater Core - Front

Four Seasons 90490 Heater Core for Astro and Safari

Four Seasons 90490 is an aluminum HVAC heater core built for front heater applications in select Chevrolet Astro and GMC Safari vans. It is an OE-style replacement that meets or exceeds OEM requirements and is sized for a direct-fit service repair.

Key Features

• Aluminum heater core construction
• Core dimensions: 7 in. height, 7 in. width, 1 in. depth
• Tube size: 0.750 in. / 19.050 mm on both connections
• Front HVAC heater core application
• Meets or exceeds OEM specifications
• Four Seasons heater core line

Product Details

The Four Seasons Heater Core line focuses on replacement HVAC cores for vehicles that need dependable cabin heat performance. Part number 90490 uses an aluminum core material and a compact 7 x 7 x 1 inch layout, making it a direct replacement option for the front heater system in 1985-1995 Chevrolet Astro and 1985-1995 GMC Safari models. This part cross-references Dorman - HELP 93490 and Spectra Premium 94490 for the same application.

Compatible With 1985-1995 Chevrolet Astro, front heater core service and 1985-1995 GMC Safari, front heater core service. The Four Seasons 90490 heater core is also referenced by interchange part numbers including 398213 and 553490, which helps when matching an existing HVAC repair order or verifying replacement options.

Common Repair Uses

• Restores cabin heat output when the original core is restricted
• Replaces a leaking heater core in the front HVAC case
• Addresses poor defrost performance caused by reduced coolant flow through the core
• Supports repair of coolant odor or damp carpet conditions linked to heater core failure
• Provides a direct replacement for worn or corroded aluminum heater core assemblies

Installation Notes

Verify the vehicle’s HVAC configuration before installation and confirm the tube orientation and dimensions match the original unit. Inspect hoses, clamps, and the heater case for wear or contamination during service so the new core is not compromised by a related cooling-system issue. Proper coolant refill and air bleeding are important after heater core replacement.

Quality Assurance

This heater core meets or exceeds OEM requirements and is built as an aluminum replacement for the specified front HVAC application. Four Seasons part 90490 is engineered for service replacement use in Chevrolet Astro and GMC Safari heater core repairs.