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Four Seasons 39099 A/C Expansion Valve - Front
| Brand | Four Seasons 39099 |
|---|---|
| Position | Front |
| Color | Aluminum |
| Description | Expansion Valves |
| Liquid Inlet Fitting Gender | Female |
| Liquid Inlet Fitting Thread Diameter | No. 6 |
| Liquid Inlet Size IN | 0.34 |
| Liquid Inlet Size MM | 8.6 |
| Liquid Inlet Style | Sealing Washer |
| Liquid Inlet Thread Type | Not Threaded |
| Liquid Inlet Type | Sealing Washer |
| Liquid Outlet Fitting Gender | Female |
| Liquid Outlet Fitting Thread Diameter | No. 8 |
| Liquid Outlet Style | Sealing Washer |
| Liquid Outlet Thread Type | Not Threaded |
| Liquid Outlet Type | Sealing Washer |
| Lqd Out Size IN | 0.46 |
| Lqd Out Size MM | 11.8 |
| Material | Aluminum |
| Meets / Exceeds OEM? | Yes |
| Mounting Hole Quantity | 2 |
| O-Ring A Number/Desc | [24401] / Slim Line Sealing Washer |
| O-Ring B Number/Desc | [24402] / Slimline Washer |
| O-Ring C Number/Desc | [24404] / Slimline Washer |
| Refrigerant Type | R134A |
| Style | w/o Solenoid |
| Suc In Size IN | 0.69 |
| Suc In Size MM | 17.6 |
| Suc Out Size IN | 0.69 |
| Suc Out Size MM | 17.6 |
| Suction Inlet Fitting Gender | Female |
| Suction Inlet Fitting Thread Diameter | No. 12 |
| Suction Inlet Style | Sealing Washer |
| Suction Inlet Thread Type | Not Threaded |
| Suction Inlet Type | Sealing Washer |
| Suction Outlet Fitting Gender | Female |
| Suction Outlet Fitting Thread Diameter | No. 12 |
| Suction Outlet Style | Sealing Washer |
| Suction Outlet Thread Type | Not Threaded |
| Suction Outlet Type | Sealing Washer |
| Super Heat | -1.000 |
| Switch Included? | Not Included |
| Tonnage | 1.500 |
| Type | Block Type |
| Product line | Expansion Valve |
| Fits | Buick, Chevrolet, Pontiac, and Oldsmobile · 18 vehicles |
OE direct replacement. Meets or exceeds OEM requirements for dependable A/C service.
Aluminum construction. Lightweight material helps support efficient refrigerant control.
Block type design. Built without a solenoid for a straightforward valve setup.
Cross-references AMS Automotive 4628, Four Seasons 39099 and Global Parts Distributors LLC 3411323 for the same application. See all 22.
Four Seasons 39099 Expansion Valve
Four Seasons 39099 is a block-type A/C expansion valve for R134A systems, built with an aluminum body and sealing-washer connections for the liquid and suction lines. It is a direct-fit HVAC flow restrictor for front A/C service on select Buick, Pontiac, and Oldsmobile applications, including the Pontiac Aztek and Buick Rendezvous.
Key Features
- Block-type A/C expansion valve for R134A refrigerant systems
- Aluminum construction with aluminum finish
- Sealing-washer inlet and outlet connections
- Female suction and liquid fittings with OEM-style dimensions
- Meets or exceeds OEM requirements
- Front-position application for select 2001-2005 Pontiac Montana, 2001-2005 Pontiac Aztek, 2002-2005 Buick Rendezvous, and 2001-2004 Oldsmobile Silhouette
Product Details
This Four Seasons Expansion Valve line part is engineered for precise refrigerant metering in the A/C system. Part number 39099 uses a block-style design without a solenoid and is specified for 1.5 tonnage applications. The valve features female suction inlet and outlet fittings with No. 12 thread diameter, plus female liquid inlet and outlet fittings with No. 6 and No. 8 thread diameters. Its sealing-washer style connections and OEM-matching dimensions support accurate replacement service on vehicles such as the Pontiac Montana, Pontiac Aztek, and Buick Rendezvous.
This part cross-references UAC EX5901C for the same application.
What It Helps Address
- Weak or inconsistent cabin cooling
- Incorrect refrigerant flow through the evaporator circuit
- Expansion valve restriction from wear or contamination
- A/C performance loss on front HVAC systems
- Service replacement for leaking or malfunctioning OE-style valves
Installation Notes
Verify refrigerant type, line sizes, and mounting points before installation. This valve uses sealing-washer connections and a two-hole mounting pattern, so the mating surfaces should be clean and properly aligned during service. Always evacuate and recharge the system according to the vehicle manufacturer’s specifications after replacement.
Quality Assurance
Four Seasons lists this expansion valve as meeting or exceeding OEM requirements, making it a suitable replacement for factory-style HVAC service on the listed Buick, Pontiac, and Oldsmobile models.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2005 | Buick | Rendezvous | — | — | Front | Expansion Valve |
| 2005 | Pontiac | Aztek | — | — | Front | Expansion Valve |
| 2005 | Pontiac | Montana | 3.4L | V6 | Front | Expansion Valve |
| 2004 | Buick | Rendezvous | — | — | Front | Expansion Valve |
| 2004 | Oldsmobile | Silhouette | — | — | Front | Expansion Valve |
| 2004 | Pontiac | Aztek | — | — | Front | Expansion Valve |
| 2004 | Pontiac | Montana | — | — | Front | Expansion Valve |
| 2003 | Buick | Rendezvous | — | — | Front | Expansion Valve |
| 2003 | Oldsmobile | Silhouette | — | — | Front | Expansion Valve |
| 2003 | Pontiac | Aztek | — | — | Front | Expansion Valve |
| 2003 | Pontiac | Montana | — | — | Front | Expansion Valve |
| 2002 | Buick | Rendezvous | — | — | Front | Expansion Valve |
| 2002 | Oldsmobile | Silhouette | — | — | Front | Expansion Valve |
| 2002 | Pontiac | Aztek | — | — | Front | Expansion Valve |
| 2002 | Pontiac | Montana | — | — | Front | Expansion Valve |
| 2001 | Oldsmobile | Silhouette | — | — | Front | Expansion Valve |
| 2001 | Pontiac | Aztek | — | — | Front | Expansion Valve |
| 2001 | Pontiac | Montana | — | — | Front | Expansion Valve |
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