Four Seasons 90484 HVAC Heater Core
OE Quality 60-Day Returns
Four Seasons
 Heater Core

Four Seasons 90484 HVAC Heater Core

Brand Four Seasons 90484
Length 8-1/4
Thickness 1
Width 7-1/4
Core Material Aluminum
Adjustable Pipe Positioning No
Core Depth IN 1.000
Core Height IN 8.250
Core Width IN 7.250
Description Heater cores
Meets / Exceeds OEM? Yes
Style Aluminum heater core
Tube 1 IN 0.625
Tube 1 MM 15.875
Tube 2 IN 0.750
Tube 2 MM 19.050
Type Heater core /aluminum
Product line Heater Core
Fits Chevrolet and GMC · 35 vehicles

OE-style replacement. Meets or exceeds OEM requirements for a direct-fit heater core.

Aluminum construction. Lightweight core material helps support efficient heat transfer.

Compact core design. Sized for HVAC applications with a slim 1-inch depth.

Cross-references APDI 9010215, Four Seasons 90484 and Four Seasons 98484 for the same application. See all 12.

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Four Seasons 90484 Heater Core

The Four Seasons 90484 heater core is an aluminum HVAC heater core built for direct replacement in select Chevrolet and GMC trucks. It is sized at 8-1/4 inches long, 7-1/4 inches wide, and 1 inch thick, with 0.625-inch and 0.750-inch tube connections for the listed applications.

For owners searching for a heater core for 1988-1991 Chevrolet C1500, K1500, C2500, K2500, C3500, or GMC C1500, K1500, C2500, K2500, C3500 models without air conditioning, this Four Seasons heater core provides an OE-style replacement path. Part number 90484 also cross-references Gates 6825 for the same application.

Key Features

  • Four Seasons Heater Core, part number 90484
  • Aluminum core construction for HVAC heater service
  • Core dimensions: 8-1/4 in. length, 7-1/4 in. width, 1 in. thickness
  • Tube sizes: 0.625 in. and 0.750 in.
  • Meets or exceeds OEM requirements
  • Direct-fit style for listed Chevrolet and GMC truck applications

Product Details

The Four Seasons Heater Core line focuses on replacement HVAC core components for vehicle heating systems. This aluminum heater core is built to match the listed dimensions and connection sizes used in the specified Chevrolet and GMC trucks, helping restore proper coolant-to-air heat transfer through the cabin heater box. Part number 90484 is also listed with interchange references including Spectra Premium 94484 and APDI 9010215.

Fits 1988-1991 Chevrolet C1500, N/A; Fits 1988-1991 Chevrolet C2500, N/A; Fits 1988-1991 Chevrolet C35, N/A; Fits 1988-1991 Chevrolet C3500, N/A; Fits 1988-1991 Chevrolet K1500, N/A; Fits 1988-1991 Chevrolet K2500, N/A; Fits 1988-1991 Chevrolet K3500, N/A; Fits 1990 GMC C1500, N/A; Fits 1990 GMC C2500, N/A; Fits 1990 GMC C3500, N/A; Fits 1990 GMC K1500, N/A; Fits 1990 GMC K2500, N/A; Fits 1990 GMC K3500, N/A; Fits 1988 Chevrolet C15, N/A.

Common Repair Symptoms

  • Weak or uneven cabin heat
  • Coolant odor inside the vehicle
  • Fogging or film on the windshield from heater core leakage
  • Coolant loss traced to the HVAC heater core area
  • Restricted heat output in the passenger compartment

Installation Notes

Verify heater core dimensions and tube orientation against the removed part before installation. This unit does not list adjustable pipe positioning, so alignment should be checked during HVAC disassembly and reassembly. Because fitment is limited to models without air conditioning, confirm the vehicle configuration before ordering. Flush the cooling system and inspect hoses, seals, and clamps during replacement to help protect the new heater core.

Quality Assurance

This Four Seasons heater core is listed as meeting or exceeding OEM requirements for the specified applications. The aluminum construction and application-specific sizing support a direct replacement approach for select Chevrolet and GMC trucks from 1988-1991.

Related reading

This part fits 35 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
1991ChevroletC1500N/ACompatible with models that do not have air conditioning.; Heater Core
1991ChevroletC2500N/ACompatible with models that do not have air conditioning.; Heater Core
1991ChevroletC35N/ACompatible with models that do not have air conditioning.; Heater Core
1991ChevroletC3500N/ACompatible with models that do not have air conditioning.; Heater Core
1991ChevroletK1500N/ACompatible with models that do not have air conditioning.; Heater Core
1991ChevroletK2500N/ACompatible with models that do not have air conditioning.; Heater Core
1991ChevroletK3500N/ACompatible with models that do not have air conditioning.; Heater Core
1990ChevroletC1500N/ACompatible with models that do not have air conditioning.; Heater Core
1990ChevroletC2500N/ACompatible with models that do not have air conditioning.; Heater Core
1990ChevroletC35N/ACompatible with models that do not have air conditioning.; Heater Core
1990ChevroletC3500N/ACompatible with models that do not have air conditioning.; Heater Core
1990ChevroletK1500N/ACompatible with models that do not have air conditioning.; Heater Core
1990ChevroletK2500N/ACompatible with models that do not have air conditioning.; Heater Core
1990ChevroletK3500N/ACompatible with models that do not have air conditioning.; Heater Core
1990GMCC1500N/ACompatible with models that do not have air conditioning.; Heater Core
1990GMCC2500N/ACompatible with models that do not have air conditioning.; Heater Core
1990GMCC3500N/ACompatible with models that do not have air conditioning.; Heater Core
1990GMCK1500N/ACompatible with models that do not have air conditioning.; Heater Core
1990GMCK2500N/ACompatible with models that do not have air conditioning.; Heater Core
1990GMCK3500N/ACompatible with models that do not have air conditioning.; Heater Core
1989ChevroletC1500N/ACompatible with models that do not have air conditioning.; Heater Core
1989ChevroletC2500N/ACompatible with models that do not have air conditioning.; Heater Core
1989ChevroletC35N/ACompatible with models that do not have air conditioning.; Heater Core
1989ChevroletC3500N/ACompatible with models that do not have air conditioning.; Heater Core
1989ChevroletK1500N/ACompatible with models that do not have air conditioning.; Heater Core
1989ChevroletK2500N/ACompatible with models that do not have air conditioning.; Heater Core
1989ChevroletK3500N/ACompatible with models that do not have air conditioning.; Heater Core
1988ChevroletC15N/ACompatible with models that do not have air conditioning.; Heater Core
1988ChevroletC1500N/ACompatible with models that do not have air conditioning.; Heater Core
1988ChevroletC2500N/ACompatible with models that do not have air conditioning.; Heater Core
1988ChevroletC35N/ACompatible with models that do not have air conditioning.; Heater Core
1988ChevroletC3500N/ACompatible with models that do not have air conditioning.; Heater Core
1988ChevroletK1500N/ACompatible with models that do not have air conditioning.; Heater Core
1988ChevroletK2500N/ACompatible with models that do not have air conditioning.; Heater Core
1988ChevroletK3500N/ACompatible with models that do not have air conditioning.; Heater Core
Directly replaces or cross-references 12 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
APDI — 9010215Four Seasons — 90484Four Seasons — 98484Gates — 6825Global Parts Distributors LLC — 1811834Spectra Premium — 9448493484960563982415534843091251HT398241