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Four Seasons
Heater CoreFour Seasons 91546 HVAC Heater Core
| Brand | Four Seasons 91546 |
|---|---|
| Length | 7 |
| Thickness | 2 |
| Width | 7-1/4 |
| Core Material | Aluminum |
| Adjustable Pipe Positioning | No |
| Core Depth IN | 2.000 |
| Core Height IN | 7.000 |
| 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 | Buick, Cadillac, Oldsmobile, and Pontiac · 101 vehicles |
OE 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 a direct HVAC heat-exchange component.
Cross-references Anchor 2254, APDI 9010071 and Dorman - HELP 90710 for the same application. See all 29.
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Not what you need? See all HVAC Heater Core options
Four Seasons 91546 Heater Core
Four Seasons 91546 is an aluminum HVAC heater core built for direct replacement service in select Buick, Cadillac, Oldsmobile, and Pontiac applications. It is engineered to meet or exceed OEM requirements and is sized for vehicles that use a 7.000 in. height, 7.250 in. width, and 2.000 in. depth core layout.
Key Features
- Aluminum heater core construction for efficient heat transfer
- Core dimensions: 7.000 in. height, 7.250 in. width, 2.000 in. depth
- Tube sizes: 0.625 in. and 0.750 in.
- Meets or exceeds OEM specifications
- Four Seasons heater core line for HVAC repair and replacement
Product Details
The Four Seasons Heater Core line focuses on replacement HVAC components for passenger vehicles, and part number 91546 follows that approach with an aluminum core design and fixed pipe positioning. This heater core is listed for a broad range of classic GM platforms, including 1973-1977 Pontiac Grand Prix, 1973-1977 Pontiac LeMans, 1973-1977 Oldsmobile Cutlass, and 1985 Buick Riviera applications. It is also listed for 1985 Cadillac Eldorado, 1985 Cadillac Seville, and 1985 Oldsmobile Toronado service.
This part cross-references Spectra Premium 94546 and OSC 98546 for the same application. Four Seasons 91546 is a direct-fit HVAC heater core choice for restoration work and heater system repair on vehicles such as Buick Riviera, Cadillac Eldorado, and Oldsmobile Toronado.
What It Helps Fix
- Weak or uneven cabin heat
- Coolant odor inside the vehicle
- Heater core leakage at the HVAC case
- Restricted coolant flow through the heater circuit
- Loss of defrost performance caused by poor heater output
Installation Notes
Verify core dimensions, tube diameter, and pipe orientation before installation. This heater core uses fixed pipe positioning, so the HVAC case and hose routing should be checked against the original unit. Confirm vehicle-specific fitment for the exact year, make, and model listed, including 1973-1977 Pontiac Grand Prix, 1973-1977 Oldsmobile Cutlass Supreme, and 1979-1984 Cadillac Eldorado with air conditioning.
Quality Assurance
Four Seasons lists this heater core as meeting or exceeding OEM requirements, supporting replacement-level fitment and performance for HVAC service.
This part fits 101 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 |
|---|---|---|---|---|---|---|---|---|
| 1985 | Buick | Riviera | — | — | — | — | N/A | Heater Core |
| 1985 | Cadillac | Eldorado | — | — | — | — | N/A | Heater Core |
| 1985 | Cadillac | Seville | — | — | — | — | N/A | Heater Core |
| 1985 | Oldsmobile | Toronado | — | — | — | — | N/A | Heater Core |
| 1984 | Buick | Riviera | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1984 | Cadillac | Eldorado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1984 | Cadillac | Seville | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1984 | Oldsmobile | Toronado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1983 | Buick | Riviera | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1983 | Cadillac | Eldorado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1983 | Cadillac | Seville | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1983 | Oldsmobile | Toronado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1982 | Buick | Riviera | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1982 | Cadillac | Eldorado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1982 | Cadillac | Seville | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1982 | Oldsmobile | Toronado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1981 | Buick | Riviera | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1981 | Cadillac | Eldorado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1981 | Cadillac | Seville | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1981 | Oldsmobile | Toronado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1980 | Buick | Riviera | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1980 | Cadillac | Eldorado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1980 | Cadillac | Seville | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1980 | Oldsmobile | Toronado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1979 | Buick | Riviera | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1979 | Cadillac | Eldorado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1979 | Oldsmobile | Toronado | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Buick | Century | — | — | — | — | N/A | w/ AC; Heater Core |
| 1977 | Oldsmobile | Custom Cruiser | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | S | — | 3.8L | V6 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | S | — | 4.3L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | S | — | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | S | — | 6.6L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | 442 | — | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | Colonnade | — | 3.8L | V6 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | Colonnade | — | 4.3L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | Colonnade | — | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | Colonnade | — | 6.6L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | Colonnade S | — | 3.8L | V6 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | Colonnade S | — | 4.3L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | Colonnade S | — | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass | Colonnade S | — | 6.6L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass Salon | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Oldsmobile | Cutlass Supreme | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Pontiac | Grand LeMans | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Pontiac | Grand Prix | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1977 | Pontiac | LeMans | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Buick | Century | — | — | — | — | N/A | w/ AC; Heater Core |
| 1976 | Oldsmobile | Custom Cruiser | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Oldsmobile | Cutlass | S | — | 4.1L | L6 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Oldsmobile | Cutlass | S | — | 4.3L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Oldsmobile | Cutlass | S | — | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Oldsmobile | Cutlass | S | — | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Oldsmobile | Cutlass | Colonnade S | — | 4.1L | L6 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Oldsmobile | Cutlass | Colonnade S | — | 4.3L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Oldsmobile | Cutlass | Colonnade S | — | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Oldsmobile | Cutlass | Colonnade S | — | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Oldsmobile | Cutlass Salon | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Oldsmobile | Cutlass Supreme | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Pontiac | Grand LeMans | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Pontiac | Grand Prix | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1976 | Pontiac | LeMans | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1975 | Buick | Century | — | — | — | — | N/A | w/ AC; Heater Core |
| 1975 | Oldsmobile | Custom Cruiser | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1975 | Oldsmobile | Cutlass | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1975 | Oldsmobile | Cutlass Salon | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1975 | Oldsmobile | Cutlass Supreme | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1975 | Pontiac | Grand Am | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1975 | Pontiac | Grand LeMans | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1975 | Pontiac | Grand Prix | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1975 | Pontiac | LeMans | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Buick | Century | — | Sedan | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Buick | Century | — | Coupe | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Buick | Century | — | Convertible | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Buick | Century | — | Hardtop | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Buick | Century | — | Sedan | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Buick | Century | — | Coupe | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Buick | Century | — | Convertible | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Buick | Century | — | Hardtop | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Oldsmobile | Custom Cruiser | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Oldsmobile | Cutlass | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Oldsmobile | Cutlass Supreme | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Pontiac | Grand Am | — | — | 6.6L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Pontiac | Grand Am | — | — | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Pontiac | Grand Prix | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1974 | Pontiac | LeMans | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Buick | Century | — | Sedan | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Buick | Century | — | Coupe | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Buick | Century | — | Convertible | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Buick | Century | — | Hardtop | 5.7L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Buick | Century | — | Sedan | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Buick | Century | — | Coupe | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Buick | Century | — | Convertible | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Buick | Century | — | Hardtop | 7.5L | V8 | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Oldsmobile | Custom Cruiser | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Oldsmobile | Cutlass | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Oldsmobile | Cutlass Supreme | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Pontiac | Grand Am | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Pontiac | Grand Prix | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| 1973 | Pontiac | GTO | — | — | — | — | N/A | w/ AC; Heater Core |
| 1973 | Pontiac | LeMans | — | — | — | — | N/A | Compatible with vehicles equipped with air conditioning.; Heater Core |
| No rows match your filter. | ||||||||
Directly replaces or cross-references 29 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Anchor — 2254APDI — 9010071Dorman - HELP — 90710Four Seasons — 26020Four Seasons — 91546Global Parts Distributors LLC — 1812099OSC — 98546Spectra Premium — 945469071250128279117399071554546702254709132156002815601001563343302492330406903040960460303366030331913200352484067GM9071H2267HT399071ZH128