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Vents / Grilles
This Wiesner Classic heater-box control vent is an air distributor for the heating and ventilation assembly on selected Porsche 911, 912 and 912E models. Can be used for Left or Right.
Sold each - 2 required per car
Fits
- Porsche 911 - 1969 to 1989
- Porsche 911 turbo - 1975 to 1989
- Porsche 912 - 1969 to 1976
- 912E 4CYL 1976
Check fitment for your specific vehicle (model, year, engine) before ordering.
Diagram ref no 20
What This Product Does
The vent forms part of the air-distribution assembly, helping direct ventilation and heating airflow. It is intended for work on the heater-box distribution components rather than the refrigerant circuit.
Functions
- Directs air through the heating and ventilation assembly.
- Supports control of cabin airflow distribution.
Technical Details
- Internal diagrams identify the component as an air distributor.
- Diagram identifier 91157134701 appears with the marking /L.
- Diagram identifier 91157134801 appears with /R and, for the M559 application, /LL.
Symptoms of Fault
Restricted or inconsistent airflow, sticking adjustment and rattling can justify inspection of the distribution assembly. Check the associated connections and fixings before identifying the vent as the cause.
Why Replacement Matters
Renewing a damaged distribution component can help restore airflow control during a heating-system repair or classic-car restoration. Inspect accessible seals, clips and fixings at the same time.
FAQs
- How should compatibility be checked?
Compare the vehicle's model and production year with the application details, then check the original component and relevant diagram identifiers. - How many are needed?
Each unit is supplied individually; two are required per vehicle.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91157134701
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 912E 4CYL 1976
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Porsche Air Vents & Grilles | Precision Airflow & Interior Comfort Control
Air vents and grilles are essential to your Porsche’s heating, ventilation, and air conditioning (HVAC) system. They control the direction and flow of air within the cabin, ensuring balanced cooling, heating, and defrosting performance. Designed for precision and durability, these components also enhance your vehicle’s interior aesthetics while maintaining optimal airflow efficiency.
At Design911, we supply premium vents and grilles engineered to meet or exceed original design standards. Crafted from durable, heat-resistant materials with exact fitment, our products provide smooth directional control, quiet operation, and a refined cabin appearance.
Whether you’re restoring a classic Porsche interior or replacing worn or damaged components, our vents and grilles deliver dependable airflow management and perfect style integration.
What Do Air Vents & Grilles Do?
Vents and grilles play a key role in your Porsche’s climate control system by distributing air evenly throughout the cabin.
Core Functions:
Direct airflow for heating, cooling, and defrosting. Regulate air volume and direction via adjustable louvers. Provide ventilation to critical cabin zones. Protect HVAC components from debris and dust. Enhance interior styling and comfort.Properly functioning vents ensure consistent cabin temperatures and optimal air distribution from the HVAC system.
Why Do Air Vents & Grilles Fail or Wear Out?
Over time, vents and grilles can degrade due to exposure to sunlight, heat, and repeated use.
Common Causes of Failure Include:
- Broken or loose vent louvers and adjustment mechanisms.
- Fading or cracking from UV exposure.
- Dust or debris accumulation causing restricted airflow.
- Damaged vent tabs or clips affecting fitment.
- Interior wear or impact damage over years of use.
When vents become damaged or misaligned, airflow efficiency drops, leading to uneven heating, cooling, and ventilation performance.
Why Replace Your Porsche Air Vents & Grilles?
Replacing worn vents and grilles restores proper airflow direction and ensures a refreshed, premium cabin appearance. Upgraded or restored components improve climate control precision and prevent airflow loss.
Key Benefits:
- Restores accurate airflow control and distribution.
- Prevents air leaks and blocked vent paths.
- Enhances interior look and comfort.
- Improves HVAC system efficiency and responsiveness.
- Compatible with Porsche 911, Boxster, Cayman, Panamera, Macan, Cayenne, and classic models.
- Perfect for restorations, detailing, and climate system maintenance.
For best results, inspect duct seals and connections during
replacement to ensure full air pressure restoration and quiet operation.
Highlights
Monday-Friday: 8.30am - 5.30pm (GMT)
Saturday: Closed
Sunday: Closed