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Nissens 999949 A/C Expansion Valve
| Brand | Nissens 999949 |
|---|---|
| Material | Aluminum |
| Refrigerant Type | R134 |
| Type | Block |
| Mounting Hardware Included | Yes |
| O-ring Quantity | 4 |
| O-rings Included | Yes |
| Fits | Porsche · 38 vehicles |
OE matching standards. Precision-tested for pressure performance, tightness, opening, and set-point accuracy.
Aluminum construction. Lightweight material helps support reliable thermal control.
O-rings included. Comes with sealing rings and mounting bolts whenever applicable.
Cross-references Global Parts Distributors LLC 3411775, 3131124 and 99657392900 for the same application. See all 6.
Nissens A/C Expansion Valve for Porsche
The Nissens 999949 A/C expansion valve is a block-style thermal expansion valve built for precise refrigerant control in Porsche HVAC systems. It is compatible with select Porsche 911, Boxster, and Cayman applications using R134 refrigerant, and it includes OE-style mounting hardware and O-rings where applicable.
Key Features
- Block-style A/C expansion valve for HVAC refrigerant metering
- Aluminum construction for durable service in the A/C system
- Designed for R134 refrigerant systems
- Includes mounting hardware and O-rings
- OE-matching pressure performance, tightness, opening, set-point setting, and internal finish
- Part number: 999949
Detailed Description
Nissens 999949 is a thermal expansion valve engineered to regulate refrigerant flow across the evaporator in Porsche air conditioning systems. It is built to strict manufacturing standards and validated for pressure performance, sealing, opening behavior, set-point accuracy, and internal finish to match OE requirements. This part number 999949 is a direct-fit service component for Porsche 911, Porsche Boxster, and Porsche Cayman models listed below.
This part cross-references Global Parts Distributors LLC 3411775 for the same application.
Vehicle Fitment
- Fits 1999-2013 Porsche 911, N/A
- Fits 1997-2012 Porsche Boxster, N/A
- Fits 2006-2012 Porsche Cayman, N/A
Common Issues This Part Can Address
- Incorrect refrigerant metering at the evaporator
- Weak or inconsistent cabin cooling
- Erratic A/C outlet temperatures
- Restricted refrigerant flow caused by a worn expansion valve
- Sealing issues at the valve connection points
Installation Notes and Tips
Verify the vehicle uses R134 refrigerant before installation. Replace the valve only after confirming the system is clean, evacuated, and free of contamination. Use the included O-rings and mounting hardware where applicable, and inspect mating surfaces for wear or debris before reassembly. Confirm the replacement matches the original block-style valve layout on the Porsche 911, Boxster, or Cayman application.
Quality Assurance
Nissens manufactures this expansion valve to OE-matching standards and tests each design for pressure control, sealing integrity, opening characteristics, set-point accuracy, and internal finish. The result is a service part built for consistent A/C system performance in Porsche applications.
| Year | Make | Model | Liters | Cylinders | Notes |
|---|---|---|---|---|---|
| 2013 | Porsche | 911 | 3.8L | H6 | — |
| 2012 | Porsche | 911 | 3.8L | H6 | — |
| 2012 | Porsche | Boxster | — | — | — |
| 2012 | Porsche | Cayman | — | — | — |
| 2011 | Porsche | 911 | — | — | — |
| 2011 | Porsche | Boxster | — | — | — |
| 2011 | Porsche | Cayman | — | — | — |
| 2010 | Porsche | 911 | — | — | — |
| 2010 | Porsche | Boxster | — | — | — |
| 2010 | Porsche | Cayman | — | — | — |
| 2009 | Porsche | 911 | — | — | — |
| 2009 | Porsche | Boxster | — | — | — |
| 2009 | Porsche | Cayman | — | — | — |
| 2008 | Porsche | 911 | — | — | — |
| 2008 | Porsche | Boxster | — | — | — |
| 2008 | Porsche | Cayman | — | — | — |
| 2007 | Porsche | 911 | — | — | — |
| 2007 | Porsche | Boxster | — | — | — |
| 2007 | Porsche | Cayman | — | — | — |
| 2006 | Porsche | 911 | — | — | — |
| 2006 | Porsche | Boxster | — | — | — |
| 2006 | Porsche | Cayman | — | — | — |
| 2005 | Porsche | 911 | — | — | — |
| 2005 | Porsche | Boxster | — | — | — |
| 2004 | Porsche | 911 | — | — | — |
| 2004 | Porsche | Boxster | — | — | — |
| 2003 | Porsche | 911 | — | — | — |
| 2003 | Porsche | Boxster | — | — | — |
| 2002 | Porsche | 911 | 3.6L | H6 | — |
| 2002 | Porsche | Boxster | — | — | — |
| 2001 | Porsche | 911 | — | — | — |
| 2001 | Porsche | Boxster | — | — | — |
| 2000 | Porsche | 911 | — | — | — |
| 2000 | Porsche | Boxster | 3.2L | H6 | — |
| 1999 | Porsche | 911 | — | — | — |
| 1999 | Porsche | Boxster | — | — | — |
| 1998 | Porsche | Boxster | — | — | — |
| 1997 | Porsche | Boxster | — | — | — |
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