Four Seasons 90764 HVAC Heater Core - Rear

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Heater Core

Four Seasons 90764 HVAC Heater Core - Rear

Brand	Four Seasons 90764
Position	Rear
Length	8-1/4
Thickness	1
Width	6-1/4
Core Material	Aluminum
Adjustable Pipe Positioning	No
Core Depth IN	1.000
Core Height IN	8.250
Core Width IN	6.250
Description	Heater cores
Meets / Exceeds OEM?	Yes
Style	Aluminum heater core
Tube 1 IN	0.750
Tube 1 MM	19.050
Tube 2 IN	0.750
Tube 2 MM	19.050
Type	Heater core /aluminum
Product line	Heater Core
Fits	Cadillac, Chevrolet, and GMC · 93 vehicles

OE direct replacement. Meets or exceeds OEM requirements for dependable fit and function.

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

Heater core. Restores cabin heat through the HVAC system.

Cross-references APDI 9010003, Four Seasons 90764 and Global Parts Distributors LLC 1811848 for the same application. See all 13.

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Not what you need? See all HVAC Heater Core options

Four Seasons 90764 Rear Heater Core

Four Seasons 90764 is an aluminum HVAC heater core built for rear heating applications on select GM SUVs and trucks. With OE-matching dimensions and direct-fit tube sizing, it supports replacement of a leaking or restricted rear heater core in vehicles such as the Chevrolet Suburban, Tahoe, GMC Yukon, and Cadillac Escalade.

Key Features

Aluminum heater core construction
Core dimensions: 8-1/4 in. length, 6-1/4 in. width, 1 in. thickness
Tube size: 0.750 in. / 19.050 mm on both connections
Meets or exceeds OEM requirements
Rear HVAC heater core application
Four Seasons part number 90764

Product Details

This Four Seasons Heater Core line focuses on direct replacement HVAC components for heating system service. Part number 90764 uses an aluminum core design with a compact 8.250 in. height, 6.250 in. width, and 1.000 in. depth, making it a practical replacement for rear heater core service where factory-style fit and tube alignment matter. It is listed for rear positions on 1992-2000 Chevrolet and GMC applications, including the Chevrolet Suburban, Tahoe, Blazer, GMC Yukon, and Cadillac Escalade.

This part cross-references UAC HT398359C for the same application.

Vehicle Fitment

Fits 1999-2000 Cadillac Escalade, rear.
Fits 2000 Chevrolet Suburban 1500, rear. Old Body Style HVAC heater core fitment.
Fits 2000 Chevrolet Suburban 2500, rear. Old Body Style HVAC heater core fitment.
Fits 2000 Chevrolet Tahoe, rear. Old Body Style HVAC heater core fitment.
Fits 1992-1999 Chevrolet C1500 Suburban, rear.
Fits 1992-1999 Chevrolet C2500 Suburban, rear.
Fits 1992-1999 Chevrolet K1500 Suburban, rear.
Fits 1992-1999 Chevrolet K2500 Suburban, rear.
Fits 1995-1999 Chevrolet Suburban 1500, rear.
Fits 1995-1999 Chevrolet Tahoe, rear.
Fits 1992-1994 Chevrolet Blazer, rear.
Fits 2000 GMC Yukon, rear. Old Body Style HVAC heater core fitment.
Fits 2000 GMC Yukon XL 1500, rear. Old Body Style HVAC heater core fitment.
Fits 2000 GMC Yukon XL 2500, rear. Old Body Style HVAC heater core fitment.
Fits 1992-1999 GMC C1500 Suburban, rear.
Fits 1992-1999 GMC C2500 Suburban, rear.
Fits 1992-1999 GMC K1500 Suburban, rear.
Fits 1992-1999 GMC K2500 Suburban, rear.
Fits 1992-1999 GMC Yukon, rear.

Common Repair Uses

Replacing a leaking rear heater core
Restoring rear cabin heat output
Addressing coolant odor inside the vehicle
Correcting poor heat transfer through the HVAC system
Repairing a restricted or corroded heater core

Installation Notes

Verify the rear HVAC configuration, tube orientation, and core dimensions before installation. Compare the existing unit to the 8-1/4 in. by 6-1/4 in. by 1 in. specifications and confirm the 0.750 in. tube connections match the vehicle’s heater lines. Proper coolant draining, system flushing, and leak checking after installation are recommended for a complete repair.

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 rear HVAC service on the listed Chevrolet, GMC, and Cadillac models.

This part fits 93 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Position	Notes
2000	Cadillac	Escalade	Rear	Heater Core
2000	Chevrolet	Suburban 1500	Rear	Old Body Style HVAC Heater Core Fitment; Heater Core
2000	Chevrolet	Suburban 2500	Rear	Old Body Style HVAC Heater Core Fitment; Heater Core
2000	Chevrolet	Tahoe	Rear	Old Body Style HVAC Heater Core Fitment; Heater Core
2000	GMC	Yukon	Rear	Old Body Style HVAC Heater Core Fitment; Heater Core
2000	GMC	Yukon XL 1500	Rear	Old Body Style HVAC Heater Core Fitment; Heater Core
2000	GMC	Yukon XL 2500	Rear	Old Body Style HVAC Heater Core Fitment; Heater Core
1999	Cadillac	Escalade	Rear	Heater Core
1999	Chevrolet	C1500 Suburban	Rear	Heater Core
1999	Chevrolet	C2500 Suburban	Rear	Heater Core
1999	Chevrolet	K1500 Suburban	Rear	Heater Core
1999	Chevrolet	K2500 Suburban	Rear	Heater Core
1999	Chevrolet	Suburban 1500	Rear	Heater Core
1999	Chevrolet	Tahoe	Rear	Heater Core
1999	GMC	C1500 Suburban	Rear	Heater Core
1999	GMC	C2500 Suburban	Rear	Heater Core
1999	GMC	K1500 Suburban	Rear	Heater Core
1999	GMC	K2500 Suburban	Rear	Heater Core
1999	GMC	Yukon	Rear	Heater Core
1998	Chevrolet	C1500 Suburban	Rear	Heater Core
1998	Chevrolet	C2500 Suburban	Rear	Heater Core
1998	Chevrolet	K1500 Suburban	Rear	Heater Core
1998	Chevrolet	K2500 Suburban	Rear	Heater Core
1998	Chevrolet	Suburban 1500	Rear	Heater Core
1998	Chevrolet	Tahoe	Rear	Heater Core
1998	GMC	C1500 Suburban	Rear	Heater Core
1998	GMC	C2500 Suburban	Rear	Heater Core
1998	GMC	K1500 Suburban	Rear	Heater Core
1998	GMC	K2500 Suburban	Rear	Heater Core
1998	GMC	Yukon	Rear	Heater Core
1997	Chevrolet	C1500 Suburban	Rear	Heater Core
1997	Chevrolet	C2500 Suburban	Rear	Heater Core
1997	Chevrolet	K1500 Suburban	Rear	Heater Core
1997	Chevrolet	K2500 Suburban	Rear	Heater Core
1997	Chevrolet	Suburban 1500	Rear	Heater Core
1997	Chevrolet	Tahoe	Rear	Heater Core
1997	GMC	C1500 Suburban	Rear	Heater Core
1997	GMC	C2500 Suburban	Rear	Heater Core
1997	GMC	K1500 Suburban	Rear	Heater Core
1997	GMC	K2500 Suburban	Rear	Heater Core
1997	GMC	Yukon	Rear	Heater Core
1996	Chevrolet	C1500 Suburban	Rear	Heater Core
1996	Chevrolet	C2500 Suburban	Rear	Heater Core
1996	Chevrolet	K1500 Suburban	Rear	Heater Core
1996	Chevrolet	K2500 Suburban	Rear	Heater Core
1996	Chevrolet	Suburban 1500	Rear	Heater Core
1996	Chevrolet	Tahoe	Rear	Heater Core
1996	GMC	C1500 Suburban	Rear	Heater Core
1996	GMC	C2500 Suburban	Rear	Heater Core
1996	GMC	K1500 Suburban	Rear	Heater Core
1996	GMC	K2500 Suburban	Rear	Heater Core
1996	GMC	Yukon	Rear	Heater Core
1995	Chevrolet	C1500 Suburban	Rear	Heater Core
1995	Chevrolet	C2500 Suburban	Rear	Heater Core
1995	Chevrolet	K1500 Suburban	Rear	Heater Core
1995	Chevrolet	K2500 Suburban	Rear	Heater Core
1995	Chevrolet	Suburban 1500	Rear	Heater Core
1995	Chevrolet	Tahoe	Rear	Heater Core
1995	GMC	C1500 Suburban	Rear	Heater Core
1995	GMC	C2500 Suburban	Rear	Heater Core
1995	GMC	K1500 Suburban	Rear	Heater Core
1995	GMC	K2500 Suburban	Rear	Heater Core
1995	GMC	Yukon	Rear	Heater Core
1994	Chevrolet	Blazer	Rear	Heater Core
1994	Chevrolet	C1500 Suburban	Rear	Heater Core
1994	Chevrolet	C2500 Suburban	Rear	Heater Core
1994	Chevrolet	K1500 Suburban	Rear	Heater Core
1994	Chevrolet	K2500 Suburban	Rear	Heater Core
1994	GMC	C1500 Suburban	Rear	Heater Core
1994	GMC	C2500 Suburban	Rear	Heater Core
1994	GMC	K1500 Suburban	Rear	Heater Core
1994	GMC	K2500 Suburban	Rear	Heater Core
1994	GMC	Yukon	Rear	Heater Core
1993	Chevrolet	Blazer	Rear	Heater Core
1993	Chevrolet	C1500 Suburban	Rear	Heater Core
1993	Chevrolet	C2500 Suburban	Rear	Heater Core
1993	Chevrolet	K1500 Suburban	Rear	Heater Core
1993	Chevrolet	K2500 Suburban	Rear	Heater Core
1993	GMC	C1500 Suburban	Rear	Heater Core
1993	GMC	C2500 Suburban	Rear	Heater Core
1993	GMC	K1500 Suburban	Rear	Heater Core
1993	GMC	K2500 Suburban	Rear	Heater Core
1993	GMC	Yukon	Rear	Heater Core
1992	Chevrolet	Blazer	Rear	Heater Core
1992	Chevrolet	C1500 Suburban	Rear	Heater Core
1992	Chevrolet	C2500 Suburban	Rear	Heater Core
1992	Chevrolet	K1500 Suburban	Rear	Heater Core
1992	Chevrolet	K2500 Suburban	Rear	Heater Core
1992	GMC	C1500 Suburban	Rear	Heater Core
1992	GMC	C2500 Suburban	Rear	Heater Core
1992	GMC	K1500 Suburban	Rear	Heater Core
1992	GMC	K2500 Suburban	Rear	Heater Core
1992	GMC	Yukon	Rear	Heater Core
No rows match your filter.

Directly replaces or cross-references 13 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

APDI — 9010003Four Seasons — 90764Global Parts Distributors LLC — 1811848Global Parts Distributors LLC — 8231352OSC — 98764Remy — 94764UAC — HT398359C9376496048398359553764660175352467017

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