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Four Seasons 84549 HVAC Heater Control Valve
| Brand | Four Seasons 84549 |
|---|---|
| Material | Steel |
| Type | Heater fitting |
| Center B Width IN | 1.000 |
| Center B Width MM | 25.400 |
| Center Width IN | 1.250 |
| Center Width MM | 31.750 |
| Description | Heater fittings |
| Fitting Size End 1 | 0.625 |
| Fitting Size End 2 | 0.75 |
| Inlet Dia. Fraction | 1 |
| Inlet Dia. IN | 1.000 |
| Inlet Dia. MM | 25.400 |
| Inlet Length IN | 0.8125 |
| Inlet Length MM | 20.638 |
| Outlet C Length IN | 0.750 |
| Outlet C Length MM | 19.050 |
| Outlet D Length IN | 1.000 |
| Outlet D Length MM | 25.400 |
| Outlet Length IN | 0.8125 |
| Outlet Length MM | 20.638 |
| Overall Depth IN | 1.750 |
| Overall Depth MM | 44.450 |
| Printed Foot Note | 5/8" hose to 3/4" npt; w/restrictor |
| Style | Straight fitting |
| Thread Size | 3/4 |
| Product line | Heater Fitting |
| Fits | GMC and Oldsmobile · 7 vehicles |
Steel construction. Durable heater fitting for dependable coolant routing.
Straight fitting. Simple inline design for clean, compact hose connections.
Restrictor included. Helps control flow through the heater circuit.
Cross-references ACI 84549, 90458 and 155372 for the same application. See all 12.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Four Seasons 84549 Heater Fitting Overview
Four Seasons 84549 is a steel heater fitting for HVAC heater control valve applications. It is built as a straight fitting with a 3/4 thread size and a restrictor, with a 5/8 inch hose connection to 3/4 inch NPT. This heater fitting is listed for 1985-1989 GMC Safari and 1990-1991 Oldsmobile Cutlass Supreme applications.
Key Features
- Brand: Four Seasons Heater Fitting
- Part number: 84549
- Steel construction for HVAC heater line service
- Straight fitting design
- 5/8 inch hose to 3/4 inch NPT connection with restrictor
- Inlet diameter: 1.000 in. / 25.400 mm
- Fitting sizes: 0.625 end 1 and 0.75 end 2
- Cross-reference example: ACI 84549
Product Details
Four Seasons 84549 is a heater fitting used in HVAC temperature control plumbing where a straight steel adapter is required. The listed dimensions include a 1.250 inch center width, 1.000 inch center B width, 0.8125 inch inlet length, and overall depth of 1.750 inches. The restrictor design and threaded 3/4 connection support heater hose routing in the specified vehicle applications, including GMC Safari and Oldsmobile Cutlass Supreme models.
Common Issues This Part Addresses
- Damaged or corroded heater fitting threads
- Leaking heater hose connection at the HVAC valve area
- Incorrect hose-to-thread adapter size during repair
- Restricted coolant flow caused by a worn fitting with an internal restrictor issue
- Failed heater line connection on GMC Safari or Oldsmobile Cutlass Supreme applications
Installation Notes and Tips
Verify hose size, thread size, and routing before installation. This part is specified as a 5/8 inch hose to 3/4 inch NPT heater fitting with restrictor, so matching the connection points to the vehicle’s heater plumbing is important. Confirm fitment for 1985-1989 GMC Safari and 1990-1991 Oldsmobile Cutlass Supreme before replacing the original fitting. Four Seasons 84549 is also referenced by part number 84549 in interchange listings.
Quality Assurance
Four Seasons supplies HVAC temperature control components and related heater fittings for service replacement use. Part number 84549 is cataloged with defined material, thread, and dimensional specifications to support accurate parts matching for the listed applications.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1991 | Oldsmobile | Cutlass Supreme | 2.3L | L4 | N/A | Heater Fitting |
| 1990 | Oldsmobile | Cutlass Supreme | 2.3L | L4 | N/A | Heater Fitting |
| 1989 | GMC | Safari | — | — | N/A | Heater Fitting |
| 1988 | GMC | Safari | — | — | N/A | Heater Fitting |
| 1987 | GMC | Safari | — | — | N/A | Heater Fitting |
| 1986 | GMC | Safari | — | — | N/A | Heater Fitting |
| 1985 | GMC | Safari | — | — | N/A | Heater Fitting |
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