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Heater flaps
- Porsche 356B 1959-63
- Porsche 356C 1963-65
The OE Match Ventilation Strainer is a replacement screen filter for the fresh-air and cabin ventilation system of Porsche 356 B and Porsche 356 C models.
Fits:- Porsche 356 B/C 1.6L 01/59-12/65
Diagram Ref No 22
Located at the passenger-compartment ventilation flap box, the strainer helps prevent larger debris, dirt and contaminants from entering the ventilation ducting while still allowing fresh air to pass through the system. It forms part of the original Porsche 356 ventilation arrangement and works alongside the flap control boxes, ducts and fresh-air inlet components.
Unlike a modern pollen or cabin filter, this component is primarily a screen-type strainer designed to stop larger particles and debris rather than provide fine filtration.
What This Product Does:
- Screens incoming ventilation air before it passes through the cabin airflow system.
- Helps prevent leaves, dirt and larger debris from entering the ventilation ducts.
- Helps keep the ventilation flap boxes and ducting cleaner.
- Allows fresh air to pass through while providing basic debris filtration.
- Helps maintain unobstructed ventilation airflow.
- Protects downstream ventilation components from contamination.
- Supports correct operation of the original Porsche 356 fresh-air system.
- Replaces a damaged, corroded, clogged or missing original strainer.
- Helps restore the original ventilation arrangement during vehicle restoration.
Parts diagrams place the strainer directly alongside the left and right ventilation flap control boxes, confirming its role within the Porsche 356 fresh-air distribution system.
Symptoms Of Wear Or Failure:
Possible signs that the strainer requires cleaning or replacement include:
- Reduced fresh-air flow through the cabin vents.
- Uneven airflow from the ventilation system.
- Visible accumulation of dirt, leaves or debris on the screen.
- Screen becoming heavily clogged.
- Torn or damaged mesh.
- Corrosion or deterioration of the strainer.
- Strainer becoming loose inside the ventilation housing.
- Rattling from the ventilation flap-box area.
- Debris entering the ventilation ducts or cabin.
- Missing sections of the screen.
- Distortion preventing the strainer from fitting correctly.
- A missing strainer discovered during restoration or ventilation-system servicing.
Reduced airflow can also be caused by blocked ducts, incorrectly adjusted ventilation flaps or damaged hoses, so the complete fresh-air system should be inspected where necessary.
Why Replacement Matters:
The ventilation strainer helps keep unwanted debris out of the fresh-air distribution system.
If the screen becomes clogged, airflow through the ventilation system can be restricted. If it becomes torn or is missing completely, leaves and other debris can enter the flap boxes and ducting.
Replacing a damaged or heavily contaminated strainer helps:
- Restore unrestricted fresh-air flow.
- Reduce debris entering ventilation ducts.
- Keep flap mechanisms cleaner.
- Prevent larger contaminants reaching the passenger compartment.
- Reduce the chance of debris causing rattles or obstruction.
- Restore the original ventilation-system configuration.
- Improve the quality of a detailed Porsche 356 restoration.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64457267306
The product you are viewing cross references to these numbers
Porsche Heater Flaps | Precision Airflow Control & Cabin Heating Efficiency
Heater flaps are an essential component in your Porsche’s air distribution and heating system. They control the direction and temperature of air entering the cabin by opening or closing air passages within the ventilation ducts. A properly functioning heater flap ensures balanced temperature control, effective defrosting, and comfortable cabin airflow.
At Design911, we supply high-quality heater flaps and actuators engineered to meet or exceed original performance standards. Each component is designed using durable heat-resistant materials for long-term reliability and smooth operation, ensuring consistent temperature regulation and precise airflow control.
Whether you’re restoring an air-cooled classic or maintaining a modern Porsche climate system, our heater flaps deliver reliable performance, proper sealing, and improved heating efficiency.
What Do Heater Flaps Do?
Heater flaps regulate the distribution and temperature of air in your Porsche’s HVAC system by directing warm or cool air through specific vents.
Core Functions:
- Control the mix of warm and cool air entering the cabin.
- Direct airflow to the windscreen, floor, or dash vents as required.
- Enable quick demisting and defrosting of glass surfaces.
- Maintain steady interior comfort in all weather conditions.
- Work in harmony with heater cables or electronic actuators.
Without functional heater flaps, airflow becomes unbalanced — resulting in uneven cabin temperatures, poor ventilation, or ineffective defrosting.
Why Do Heater Flaps Fail or Wear Out?
Heater flaps operate continuously under fluctuating temperatures and airflow pressure. Over time, the mechanisms, seals, or actuators can deteriorate.
Common Causes of Failure Include:
- Corrosion or rust in metal housings or linkages.
- Broken flap hinges or worn pivot points.
- Seized mechanisms from dirt, moisture, or lack of use.
- Damaged or perished rubber seals causing air leaks.
- Failed vacuum or servo actuators in electronically controlled systems.
When flaps fail, you may notice inconsistent heating, no airflow from certain vents, or cold air entering the cabin even when the heater is on.
Why Replace Your Porsche Heater Flaps?
Replacing worn or damaged heater flaps restores proper airflow control, prevents heat loss, and improves the overall comfort and efficiency of your heating system.
Key Benefits:
- Restores balanced airflow and temperature control.
- Prevents unwanted cold drafts or heat loss.
- Ensures proper function of demisting and defrosting.
- Improves cabin comfort in both classic and modern Porsches.
- Designed for Porsche 911, 912, 914, Cayman, Boxster, Panamera, Macan, and Cayenne models.
- Perfect for restoration, maintenance, or complete HVAC rebuilds.
Upgrading or replacing old heater flaps also enhances interior air quality and ensures your ventilation system operates as designed.
Highlights
- Precision-engineered Porsche heater flaps and actuators.
- Durable, heat-resistant materials for longevity.
- Direct-fit replacements for Porsche air-cooled and water-cooled models.
- Essential for consistent airflow and heating performance.
- Ideal for restoration, maintenance, or upgrade projects.
- Supports reliable climate control and demisting efficiency.
