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Four Seasons 39177 A/C Expansion Valve - Rear
| Brand | Four Seasons 39177 |
|---|---|
| Position | Rear |
| Material | Aluminum |
| Color | Red |
| Refrigerant Type | R134a |
| Type | Block type |
| Mounting Hole Quantity | 2 |
| Suction Inlet Fitting Gender | Female |
| Suction Outlet Fitting Gender | Female |
| Suction Inlet Fitting Thread Diameter | No. 10 |
| Suction Outlet Fitting Thread Diameter | No. 10 |
| Suction Inlet Thread Type | Not threaded |
| Suction Outlet Thread Type | Not threaded |
| Liquid Inlet Fitting Gender | Female |
| Liquid Outlet Fitting Gender | Female |
| Liquid Inlet Fitting Thread Diameter | No. 6 |
| Liquid Outlet Fitting Thread Diameter | No. 8 |
| Liquid Inlet Thread Type | Not threaded |
| Liquid Outlet Thread Type | Not threaded |
| Description | Expansion valves |
| Liquid Inlet Size IN | 0.34 |
| Liquid Inlet Size MM | 8.6 |
| Liquid Inlet Style | Sealing washer |
| Liquid Inlet Type | Sealing washer |
| Liquid Outlet Style | Sealing washer |
| Liquid Outlet Type | Sealing washer |
| Lqd Out Size IN | 0.46 |
| Lqd Out Size MM | 11.8 |
| Meets / Exceeds OEM? | Yes |
| O-Ring A Number/Desc | [24401] / slim line sealing washer |
| O-Ring A Quantity | 1 |
| O-Ring B Number/Desc | [24402] / slimline washer |
| Fits | — |
OE direct replacement. Meets or exceeds OEM requirements for dependable A/C flow control.
Block type design. Aluminum construction with sealing-washer connections for a secure fit.
R134A compatible. Built for efficient refrigerant metering in HVAC systems.
Cross-references Four Seasons 39177, Global Parts Distributors LLC 1812007 and Hygrade Tuneup 1621 for the same application. See all 41.
Four Seasons 39177 Expansion Valve Overview
Four Seasons 39177 is a block-type A/C expansion valve for R134A systems, built with an aluminum body and sealing-washer connections for controlled refrigerant metering. It is an OE-style replacement that meets or exceeds OEM requirements and is listed for 1-ton applications.
Key Features
- Block-type A/C expansion valve for R134A refrigerant systems
- Aluminum construction with red finish
- Female suction and liquid connections with sealing-washer style fittings
- 2 mounting holes for secure installation
- Super heat setting: 2.000
- Style: w/o solenoid
- Meets or exceeds OEM specifications
- Cross-reference: UAC EX529469C
Product Details
Four Seasons Expansion Valve line focuses on precise refrigerant flow control for automotive HVAC service. Part number 39177 is a block-type expansion valve with No. 10 suction inlet and outlet thread diameters, No. 6 liquid inlet, and No. 8 liquid outlet sizing. The sealing-washer inlet and outlet design supports proper sealing at the connection points, while the aluminum construction is suited for service replacement in R134A air conditioning systems. This part number 39177 is a direct-fit style replacement for vehicles using the specified connection layout, including applications such as Honda Civic and other listed interchange references.
Common A/C Problems It Can Address
- Inconsistent cabin cooling from improper refrigerant metering
- Warm air from the vents when the expansion valve is restricted
- Erratic evaporator performance caused by a worn valve
- Pressure imbalance in the A/C system
- Service replacement needs on R134A HVAC systems
Installation Notes and Tips
Verify refrigerant type, connection style, and port sizing before installation. Replace sealing washers and inspect the surrounding A/C components for contamination or wear during service. Confirm the system is properly evacuated and recharged after installation, and follow the vehicle service procedure for the exact application. Fits 2006-2011 Honda Civic, front right is not listed in the fitment data, so confirm vehicle-specific interchange before ordering.
Quality Assurance
Four Seasons 39177 is specified as meeting or exceeding OEM requirements for the listed application. Use the part number 39177 and the vehicle’s original HVAC configuration to confirm the correct replacement before service.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| No rows match your filter. | ||||