Four Seasons 91545 HVAC Heater Core

Brand	Four Seasons 91545
Length	8
Thickness	2
Width	7
Core Material	Copper
Adjustable Pipe Positioning	No
Core Depth IN	2.000
Core Height IN	8.000
Core Width IN	7.000
Description	Heater cores
Meets / Exceeds OEM?	Yes
Style	Copper/brass 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 /copper brass
Product line	Heater Core
Fits	Buick, Chevrolet, Oldsmobile, and Pontiac · 124 vehicles

OE direct replacement. Meets OEM requirements for a straightforward replacement.

Copper/brass construction. Built with copper core material for efficient heat transfer.

Heater core. Restores cabin heat through the HVAC system.

Cross-references Anchor 2256, APDI 9010070 and Dorman - HELP 94545 for the same application. See all 21.

$87.27Free shipping

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Four Seasons 91545 Heater Core Overview

The Four Seasons 91545 heater core is a copper/brass HVAC heater core built for direct replacement service in select GM A-body applications. It measures 8 inches high, 7 inches wide, and 2 inches deep, with copper core material and tube sizes of 0.625 in and 0.750 in.

Compatible with 1973-1977 Buick Century, Buick Regal, Chevrolet El Camino, Chevrolet Malibu, Chevrolet Monte Carlo, Oldsmobile Custom Cruiser, Oldsmobile Cutlass, Oldsmobile Cutlass Salon, Oldsmobile Cutlass Supreme, Pontiac Grand LeMans, Pontiac Grand Prix, Pontiac LeMans, Pontiac Grand Am, and 1973 Pontiac GTO models without air conditioning.

Key Features

Four Seasons Heater Core line
Part number 91545
Copper/brass heater core construction
Copper core material for heat transfer service
Dimensions: 8 in. height, 7 in. width, 2 in. depth
Tube sizes: 0.625 in. and 0.750 in.
Meets or exceeds OEM requirements

Product Details

Four Seasons 91545 is a replacement heater core for classic GM vehicles that use a copper/brass HVAC core in the heater case. The core dimensions and tube sizing are listed for accurate matching during repair work, and the unit is specified for models without air conditioning. This part cross-references Dorman - HELP 94545 for the same application.

Use this heater core when servicing heating performance on 1973-1977 Buick Century and Regal, Chevrolet El Camino, Malibu, and Monte Carlo, plus Oldsmobile Cutlass-family and Pontiac LeMans-family vehicles. The Four Seasons 91545 part number is also referenced in interchange listings for additional catalog matching.

Common Repair Uses

Loss of cabin heat
Coolant odor inside the vehicle
Coolant seepage from the heater case
Restricted heater output from a failing core
Replacement during HVAC system restoration on classic GM cars

Installation Notes

Verify heater case dimensions, tube orientation, and hose connection sizes before installation. This heater core is listed for vehicles without air conditioning, so confirm the HVAC configuration before ordering. Drain the cooling system, inspect hoses and clamps, and flush the system if contamination or corrosion is present. Professional installation is recommended for proper fitment and leak-free operation.

Quality Assurance

This heater core is listed as meeting or exceeding OEM requirements. Four Seasons 91545 is built for replacement use in HVAC service where correct dimensions, copper/brass construction, and application-specific fitment matter.

This part fits 124 vehicles

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

Year	Make	Model	Submodel	Body Type	Liters	Cylinders	Position	Notes
1977	Buick	Century	—	Wagon	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Buick	Century	—	Wagon	5.0L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Buick	Century	—	Wagon	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Buick	Century	—	Wagon	6.6L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Buick	Regal	—	Sedan	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Buick	Regal	—	Coupe	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Buick	Regal	—	Sedan	5.0L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Buick	Regal	—	Coupe	5.0L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Buick	Regal	—	Sedan	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Buick	Regal	—	Coupe	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Chevrolet	El Camino	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Chevrolet	Malibu	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Chevrolet	Monte Carlo	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Custom Cruiser	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	S	—	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	S	—	4.3L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	S	—	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	S	—	6.6L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	442	—	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	Colonnade	—	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	Colonnade	—	4.3L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	Colonnade	—	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	Colonnade	—	6.6L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	Colonnade S	—	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	Colonnade S	—	4.3L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	Colonnade S	—	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass	Colonnade S	—	6.6L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass Salon	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Oldsmobile	Cutlass Supreme	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Pontiac	Grand LeMans	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Pontiac	Grand Prix	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1977	Pontiac	LeMans	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Buick	Century	—	Wagon	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Buick	Century	—	Wagon	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Buick	Regal	—	Sedan	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Buick	Regal	—	Coupe	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Buick	Regal	—	Sedan	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Buick	Regal	—	Coupe	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Chevrolet	El Camino	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Chevrolet	Malibu	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Chevrolet	Monte Carlo	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Custom Cruiser	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Cutlass	S	—	4.1L	L6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Cutlass	S	—	4.3L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Cutlass	S	—	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Cutlass	S	—	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Cutlass	Colonnade S	—	4.1L	L6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Cutlass	Colonnade S	—	4.3L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Cutlass	Colonnade S	—	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Cutlass	Colonnade S	—	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Cutlass Salon	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Oldsmobile	Cutlass Supreme	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Pontiac	Grand LeMans	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Pontiac	Grand Prix	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1976	Pontiac	LeMans	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Buick	Century	—	Wagon	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Buick	Century	—	Wagon	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Buick	Regal	—	Sedan	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Buick	Regal	—	Coupe	3.8L	V6	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Buick	Regal	—	Sedan	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Buick	Regal	—	Coupe	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Chevrolet	El Camino	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Chevrolet	Malibu	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Chevrolet	Monte Carlo	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Oldsmobile	Custom Cruiser	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Oldsmobile	Cutlass	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Oldsmobile	Cutlass Salon	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Oldsmobile	Cutlass Supreme	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Pontiac	Grand Am	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Pontiac	Grand LeMans	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Pontiac	Grand Prix	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1975	Pontiac	LeMans	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Century	—	Sedan	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Century	—	Coupe	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Century	—	Convertible	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Century	—	Hardtop	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Century	—	Sedan	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Century	—	Coupe	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Century	—	Convertible	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Century	—	Hardtop	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Regal	—	Sedan	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Regal	—	Coupe	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Regal	—	Convertible	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Regal	—	Hardtop	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Regal	—	Sedan	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Regal	—	Coupe	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Regal	—	Convertible	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Buick	Regal	—	Hardtop	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Chevrolet	El Camino	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Chevrolet	Malibu	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Chevrolet	Monte Carlo	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Oldsmobile	Custom Cruiser	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Oldsmobile	Cutlass	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Oldsmobile	Cutlass Supreme	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Pontiac	Grand Am	—	—	6.6L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Pontiac	Grand Am	—	—	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Pontiac	Grand Prix	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1974	Pontiac	LeMans	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Century	—	Sedan	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Century	—	Coupe	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Century	—	Convertible	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Century	—	Hardtop	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Century	—	Sedan	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Century	—	Coupe	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Century	—	Convertible	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Century	—	Hardtop	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Regal	—	Sedan	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Regal	—	Coupe	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Regal	—	Convertible	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Regal	—	Hardtop	5.7L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Regal	—	Sedan	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Regal	—	Coupe	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Regal	—	Convertible	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Buick	Regal	—	Hardtop	7.5L	V8	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Chevrolet	El Camino	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Chevrolet	Malibu	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Chevrolet	Monte Carlo	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Oldsmobile	Custom Cruiser	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Oldsmobile	Cutlass	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Oldsmobile	Cutlass Supreme	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Pontiac	Grand Am	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Pontiac	Grand Prix	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
1973	Pontiac	GTO	—	—	—	—	N/A	w/o AC; Heater Core
1973	Pontiac	LeMans	—	—	—	—	N/A	Compatible with models that do not have air conditioning.; Heater Core
No rows match your filter.

Directly replaces or cross-references 21 part numbers

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

Anchor — 2256APDI — 9010070Dorman - HELP — 94545Four Seasons — 91545Global Parts Distributors LLC — 1812098Global Parts Distributors LLC — 82312729070907009854525014127911639907055454570225670913130246616603032GM9070H2273HT399070ZH141

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