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Heating / Air Conditioning
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
Porsche 928 Leather Dashboard Ventilation Grille - Windshield Defog Vent Kit
Restore Proper Windshield Defogging and Interior Finish
The Porsche 928 leather dashboard is equipped with dedicated
ventilation grilles that direct airflow toward the windscreen to prevent
fogging and maintain clear visibility. These defog vents are essential
components of the climate control system and interior trim.
Fits:
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
Diagram Ref No 2
Originally supplied by Porsche, this part is now NLA (No Longer Available) and often becomes brittle, cracked or damaged over time. This high-quality reproduction is identical in appearance and function to the original and is manufactured from similar durable plastic material.
The ventilation grille sits within the leather dashboard and allows heated or ambient air to flow directly onto the inside of the windshield.
Its function includes:
- Directing airflow to prevent windshield fogging
- Assisting with defrosting in cold conditions
- Supporting overall climate control efficiency
- Maintaining the clean factory appearance of the dashboard
Without a properly functioning defog vent grille, airflow can be restricted, reducing visibility and affecting interior aesthetics.
Why Porsche 928 Defog Vent Grilles Fail
After decades of heat exposure and UV radiation, original
928 dashboard vents commonly suffer from:
- Plastic cracking or splitting
- Warping due to sun exposure
- Brittleness from ageing materials
- Damage during dashboard reupholstery
- Broken mounting tabs
When restoring or reupholstering a leather dashboard, the original vent grille often cannot be reused due to its fragile condition.
Why You Should Upgrade
You should consider replacing your Porsche 928 dashboard
defog vent grille if:
- You are reupholstering or restoring the dashboard
- The original vent is cracked or faded
- Mounting points are broken
- Airflow to the windshield is reduced
- You want to restore factory-correct interior appearance
Replacing both left and right vent grilles is recommended for consistent fitment, colour matching and symmetrical interior presentation.
This reproduction part ensures:
- Correct airflow performance
- Clean integration into leather dashboards
- OEM-style fit and finish
- Long-term durability compared to aged originals
Perfect for concours restorations, full interior refurbishments or preventative replacement.
Key Benefits at a Glance
- Direct replacement for NLA Porsche part
- Identical appearance to original design
- Manufactured from durable plastic material
- Restores windshield defog airflow
- Suitable for leather dashboard 928 models
- Recommended to replace both sides for best results
- Ideal for restoration and reupholstery projects
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9285523KIT
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92

Fits:
Porsche 911 Turbo 1978-83
Porsche 928 1978-89 *
*Cars upto 1989
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919230550
The product you are viewing cross references to these numbers
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92

Fits:
Porsche 911 Turbo 1978-83
Porsche 928 1978-89 *
*Cars upto 1989
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99919230550
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
Fits:
Porsche 928 1978-91
Click 'Zoom in' for large parts diagram.
Diagram ref no 12
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92812612303
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Fits as the main air conditioning compressor in the heating & A/C system, typically mounted on the front of the engine with belt drive. Built to original equipment standards, this compressor delivers the correct displacement and operating pressure for the Porsche 928 climate system, ensuring reliable refrigerant circulation, stable pressures and consistent cabin cooling even in demanding conditions.
Fits:
Porsche 928 1980 - 1992*
* Will not fit 4.5L 928 years 1978-79
This compressor draws refrigerant from the evaporator, compresses it, and pumps it through the condenser so the system can expel heat and deliver cool, conditioned air to the interior. By maintaining the correct refrigerant flow and pressure, it ensures the A/C system can cool the cabin quickly and keep temperatures stable, supporting both comfort and demisting/defrost functions.
A worn or failing A/C compressor can cause poor or no cooling, excessive noise, seized internals, and contamination of the entire A/C system. Left unchecked, failure can damage other components like the condenser, expansion valve or receiver-drier. Replacing the compressor with an OE-match unit restores proper refrigerant circulation, protects the rest of the climate system, and brings back the comfort and refinement expected from a Porsche GT car - especially important on long trips and in warm climates.
When to replace
Consider replacing compressor if:
• The A/C no longer blows cold air or cooling is very weak.
• You hear grinding, rattling or squealing noises from the compressor area.
• There are visible oil/refrigerant leaks from the compressor body or shaft seal.
• The compressor clutch fails to engage, or cycles abnormally.
• The system has suffered an internal compressor failure (metal contamination).
• You’re performing a full A/C system restoration on a classic 928.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92812601071
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Expansion valve is a genuine OEM component designed specifically for Porsche 928 models. As part of the air conditioning system, it regulates refrigerant flow into the evaporator, maintaining correct pressure and ensuring consistent cabin cooling.
Fits:
Porsche 928 1978 - 1982
Porsche 928 1983 - 1986
Chassis no:
F >> 92GS8 40082
F >> 92GS8 49562 (J)
Diagram ref no 35
This expansion valve regulates refrigerant flow between the condenser and the evaporator, keeping system pressure balanced for efficient cooling. By preventing evaporator freeze-up, it also protects the A/C compressor from unnecessary strain. It is mounted within the A/C system, positioned between the condenser and the evaporator.
Over time, expansion valves can clog, stick, or fail, leading to poor cooling, fluctuating cabin temperatures, or excessive load on the compressor. Replacing expansion valve restores factory-correct cooling performance, ensures system longevity, and maintains comfort in your Porsche 928.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857312302
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Premium aftermarket expansion valve replacing Porsche #92857312302. It regulates refrigerant flow for consistent cooling, with OE-quality durability and long service life.
Fits:
Porsche 928 1978 - 1982
Porsche 928 1983 - 1986
Chassis no:
F >> 92GS8 40082
F >> 92GS8 49562 (J)
Diagram ref no 34
MAHLE’s Premium Line delivers OE-quality performance with precise metering, outstanding durability, and long service life for customers seeking the best.
What this product does:
• Controls refrigerant expansion from high pressure to low pressure before entering the evaporator
• Maintains consistent cooling temperature and pressure within the A/C system
• Protects the evaporator from freezing or flood by managing refrigerant volume
Why replacement matters:
When the expansion valve begins to fail, common symptoms include:
• Poor cooling or inconsistent cabin temperature
• Freezing or frosting of the evaporator High or low pressure abnormalities in the A/C system
• Flooding of refrigerant into the evaporator or compressor damage
Installing a high-quality expansion valve keeps your A/C system working properly, restores cooling efficiency, protects the compressor, and helps prevent costly damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857312302
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Expansion valve regulates refrigerant flow to the evaporator, keeping pressure balanced and cabin cooling consistent. Built to OE specifications, it provides reliable performance and proper fit.
Fits:
Porsche 928 1978 - 1982
Porsche 928 1983 - 1986
Chassis no:
F >> 92GS8 40082
F >> 92GS8 49562 (J)
Diagram ref no 34
Location: Installed in the A/C system, positioned between the condenser and the evaporator.
What this product does:
• Regulates refrigerant flow from high to low pressure
• Maintains optimal evaporator performance for steady cooling
• Protects the A/C compressor and system from pressure imbalance
Why replacement matters:
A faulty expansion valve can cause poor cooling, fluctuating cabin temperatures, evaporator freeze-up, or compressor strain. Replacing valve restores efficient air conditioning, ensures passenger comfort, and protects the A/C system from costly damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857312302
The product you are viewing cross references to these numbers
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92

Fits:
Porsche 924 / 924S 1976-88
Porsche 928 1987-92
Porsche 944 1982-91
Porsche 968 >>1992
Click 'Zoom in' for large parts diagram.
Diagram Ref No 18.
PLEASE NOTE: the After Market brand does not have the top site glass
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94457394300
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Fits:
Porsche 928 1978-86
Diagram ref no 28.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857394103
The product you are viewing cross references to these numbers
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
Fits:
Porsche 924 / 924S 1976-88
Porsche 928 1987-92
Porsche 944 1982-91
Porsche 968 >>1992
Click 'Zoom in' for large parts diagram.
Diagram Ref No 18.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94457394300
The product you are viewing cross references to these numbers
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 924 Turbo 2.0L 1982-84
- Porsche 924 Carrera GT 2.0L 1981
- Porsche 924 Carrera GTS 2.0L 1982
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92

Fits:
Porsche 924 / 924S 1976-88
Porsche 928 1987-92
Porsche 944 1982-91
Porsche 968 >>1992
Click 'Zoom in' for large parts diagram.
Diagram Ref No 18.
PLEASE NOTE: the After Market brand does not have the top site glass
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94457394300
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
Porsche 928 Leather Dashboard Ventilation Grille - Windshield Defog Vent
Restore Proper Windshield Defogging and Interior Finish
The Porsche 928 leather dashboard is equipped with dedicated
ventilation grilles that direct airflow toward the windscreen to prevent
fogging and maintain clear visibility. These defog vents are essential
components of the climate control system and interior trim.
Fits:
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
Diagram Ref No 2
Originally supplied by Porsche, this part is now NLA (No Longer Available) and often becomes brittle, cracked or damaged over time. This high-quality reproduction is identical in appearance and function to the original and is manufactured from similar durable plastic material.
The ventilation grille sits within the leather dashboard and allows heated or ambient air to flow directly onto the inside of the windshield.
Its function includes:
- Directing airflow to prevent windshield fogging
- Assisting with defrosting in cold conditions
- Supporting overall climate control efficiency
- Maintaining the clean factory appearance of the dashboard
Without a properly functioning defog vent grille, airflow can be restricted, reducing visibility and affecting interior aesthetics.
Why Porsche 928 Defog Vent Grilles Fail
After decades of heat exposure and UV radiation, original
928 dashboard vents commonly suffer from:
- Plastic cracking or splitting
- Warping due to sun exposure
- Brittleness from ageing materials
- Damage during dashboard reupholstery
- Broken mounting tabs
When restoring or reupholstering a leather dashboard, the original vent grille often cannot be reused due to its fragile condition.
Why You Should Upgrade
You should consider replacing your Porsche 928 dashboard
defog vent grille if:
- You are reupholstering or restoring the dashboard
- The original vent is cracked or faded
- Mounting points are broken
- Airflow to the windshield is reduced
- You want to restore factory-correct interior appearance
Replacing both left and right vent grilles is recommended for consistent fitment, colour matching and symmetrical interior presentation.
This reproduction part ensures:
- Correct airflow performance
- Clean integration into leather dashboards
- OEM-style fit and finish
- Long-term durability compared to aged originals
Perfect for concours restorations, full interior refurbishments or preventative replacement.
Key Benefits at a Glance
- Direct replacement for NLA Porsche part
- Identical appearance to original design
- Manufactured from durable plastic material
- Restores windshield defog airflow
- Suitable for leather dashboard 928 models
- Recommended to replace both sides for best results
- Ideal for restoration and reupholstery projects
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9285523
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95

Fits:
Porsche 928 - 1978 to 1995
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92757458703
The product you are viewing cross references to these numbers
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Fits:
Porsche 928 1978-84
Diagram ref. 4.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857456704
The product you are viewing cross references to these numbers
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Fits:
Porsche 928 1983-95 -> All models with M570*
*M570 - Air conditioner with improved efficiency.
Porsche Heating & Air Conditioning Parts
Air conditioning and heating are often taken for granted — until they stop working. In a Porsche, comfort and driving enjoyment go hand-in-hand, which makes a properly functioning heating and air conditioning system essential. At Design911, we supply a complete range of AC and heating parts to keep your Porsche’s climate control system working all year round.
From compressors, condensers, and hoses to heating elements, blower motors, and cabin filters, we have everything you need to restore performance and reliability. Whether you drive a classic Porsche or the latest model, our parts are available in both OEM and high-quality aftermarket options, all shipped worldwide.
How Long Does Porsche Air Conditioning Last?
Most manufacturers recommend servicing or regassing your Porsche’s air conditioning every 1–2 years, though some systems may last over 5 years. Even so, routine servicing is important to maintain compressor health and prevent costly failures.
A well-maintained AC system provides:
- Reliable cooling in summer and heating in winter
- Reduced risk of system breakdowns
- Improved air quality inside the cabin
- Increased comfort for driver and passengers
Common Causes of Air Conditioning Failure
When Porsche air conditioning fails, it’s
often due to:
- Low Refrigerant Gas – natural leakage over time reduces cooling efficiency
- Perforated Hoses or Pipes – allowing gas or fluid to escape
- Corroded Condensers – a common cause of AC loss in older vehicles
- Faulty Compressors – leading to complete system failure
These issues are repairable, but costs vary depending on the model and extent of damage. Regular servicing helps catch minor faults before they become major repairs.
How Often Should Heating & AC Be Checked?
To avoid discomfort and costly repairs, have
your Porsche’s heating and air conditioning system checked every 12–24
months. Over time, gas levels naturally decrease, reducing efficiency. If
levels drop too far, you risk:
- Loss of in-cabin cooling/heating
- Increased strain on compressors and other system components
- Expensive repairs from avoidable wear
A service keeps your system in good condition, while a repair addresses specific faults. If major issues are found during a service, we’ll notify you before carrying out any additional work.
Why Choose
Design911 for Porsche Heating & AC Parts?
Shop Porsche Heating & Air Conditioning parts today – from condensers and compressors to hoses and blower motors – and keep your Porsche comfortable in every season.