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- Accessories
- Brakes
- Chassis / Bodywork
- Clothing & Gifts
- Electrical & Relays
- Engine Cooling
- Engine Electrical
- Engine Rebuild Parts
- Engine Tuning
- Exhausts
- Exterior Styling / Spoilers
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Heater flaps
Fits:
Porsche 356 / A 1950-59
Porsche 356 B / C 1960-65
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64421125100KIT
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits:
Porsche 356C 1964-65
COUPE -REUTTER-
COUPE -KARMANN-
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
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Related, superseded, cross reference or alternative numbers for comparison.
64421100
The product you are viewing cross references to these numbers
- Porsche 356C 1963-65
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356A - 1955 to 1959
Porsche 356B - 1959 to 1963
Porsche 356C - 1963 to 1965
Section of diagram ref no 30
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Related, superseded, cross reference or alternative numbers for comparison.
61610604
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 / A 1950-59
Porsche 356 B / C 1960-65
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
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Related, superseded, cross reference or alternative numbers for comparison.
PCG07401401
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 A/B/C (1950 to 1965)
Click 'Zoom in' for large parts diagram.
Diagram ref nos 5, 6, 7, 8.
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Related, superseded, cross reference or alternative numbers for comparison.
PCG35621100
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 50-65
Click 'Zoom in' for large parts diagram.
Diagram ref no 31
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Related, superseded, cross reference or alternative numbers for comparison.
53906541
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 B T6 / 356C 1.6 08/1962-12/1965
Click 'Zoom in' for large parts diagram.
Diagram ref no 39
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Related, superseded, cross reference or alternative numbers for comparison.
64457269
The product you are viewing cross references to these numbers
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 / A 1950-59
Porsche 356 B / C 1960-65
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG21125100
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 A (NOT for Carrera)
Porsche 356 B
Porsche 356 C
Click 'Zoom in' for large parts diagram.
Diagram ref no 8
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Related, superseded, cross reference or alternative numbers for comparison.
64421175100
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356, 356A
Click 'Zoom in' for large parts diagram.
Diagram ref no 32
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53906644
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 - 1950 to 1955
Porsche 356A - 1555 to 1959
Not for Carrera
Heater box vent hose 50x130mm.
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
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Related, superseded, cross reference or alternative numbers for comparison.
64421192100
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
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12 Month Warranty
Worldwide Delivery
Sold each - 2 required per car
Fits:
Porsche 356 - 1950 to 1955
Porsche 356A - 1555 to 1959
Not for Carrera
Heater box hose 50mm x 270mm
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
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64421192105
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
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12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 - 1950 to 1955
Porsche 356A - 1555 to 1959
Not for Carrera
Flexible Stainless Steel (approx 140mm )
Diagram ref no 1
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35655120
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
- Porsche 356A 1955-59
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12 Month Warranty
Worldwide Delivery
The OE MATCH Heater Box, Black Powder Coated, Pair is a high-quality replacement set of heater boxes designed for classic Porsche heating systems. These heater boxes surround the exhaust heat exchangers and capture heat generated by the engine's exhaust system, directing warm air into the cabin through the vehicle's heating and ventilation ducts.
Fits:
- Porsche 356A 1955-59
Diagram Ref No 2
Finished in a durable black powder-coated coating, these heater boxes offer enhanced corrosion resistance, improved durability, and an original-style appearance. Manufactured to OE specifications, they provide proper fitment, efficient heat transfer, and reliable operation, making them ideal for restoration projects or replacing corroded and damaged original units.
What This Product Does:
- Captures heat generated by the exhaust heat exchangers
- Directs warm air into the cabin heating system
- Provides efficient cabin heating and demisting performance
- Helps maintain passenger comfort in cold weather
- Protects heating system airflow around the heat exchangers
- Supports proper operation of the vehicle's heating and ventilation system
Symptoms Of Wear Or Failure:
- Poor cabin heating performance
- Reduced airflow from heating vents
- Rust, corrosion, or perforation of the heater box housing
- Heat loss before warm air reaches the cabin
- Exhaust fumes entering the heating system
- Rattling or vibration from damaged housings
- Uneven cabin temperatures Visible deterioration of heater box components
Why Replacement Matters:
- Restores efficient cabin heating performance
- Improves airflow and heat delivery to the passenger compartment
- Helps prevent heat loss within the heating system
- Reduces the risk of exhaust fumes entering the cabin
- Protects heat exchangers and heating system components
- Improves vehicle comfort during cold weather operation
- Supports accurate restoration of classicPorsche models
- Provides long-term corrosion resistance and durability with black powder-coated protection
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64421102100
The product you are viewing cross references to these numbers
- Porsche 356A 1955-59
Shop Securely
12 Month Warranty
Worldwide Delivery
The OE MATCH Heater Box, Black Powder Coated, Pair is a premium-quality replacement set of heater boxes designed for classic Porsche heating systems. These heater boxes enclose the exhaust heat exchangers and channel heated air into the vehicle's cabin heating and ventilation system, providing effective interior heating, demisting, and occupant comfort.
Fits:
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Diagram Ref No 1
Manufactured to OE specifications and finished with a durable black powder-coated coating, these heater boxes offer excellent corrosion resistance, long-term durability, and an original-style appearance. They are ideal for restoration projects or replacing rusted, damaged, or deteriorated original units, helping to restore heating system efficiency and reliability.
What This Product Does:
- Captures heat generated by the exhaust heat exchangers
- Directs heated air into the cabin heating and ventilation system
- Provides effective interior heating and windscreen demisting
- Supports proper airflow through the heating system
- Helps maintain passenger comfort in colder weather
- Protects and channels airflow around the heat exchanger assemblies
Symptoms Of Wear Or Failure:
- Poor cabin heating output
- Reduced airflow from heating vents
- Rust, corrosion, or holes in the heater box housing
- Heat loss before warm air reaches the passenger compartment
- Exhaust fumes entering the cabin heating system
- Rattling or vibration caused by deteriorated housings
- Uneven cabin temperatures
- Visible deterioration or structural damage to the heater boxes
Why Replacement Matters:
- Restores efficient cabin heating and demisting performance
- Improves airflow through the heating system
- Reduces heat loss and improves heating efficiency
- Helps prevent exhaust fumes from entering the cabin
- Protects heating system components and heat exchangers
- Supports accurate restoration of classic Porsche models
- Provides long-lasting corrosion protection with black powder-coated finish
- Maintains vehicle comfort, safety, and reliability in all weather conditions
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64421102505
The product you are viewing cross references to these numbers
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 356 - 1950 to 1955
Not for Carrera
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
3565501
The product you are viewing cross references to these numbers
- Porsche 356 1950-55
Shop Securely
12 Month Warranty
Worldwide Delivery
-
Air cooling 356, 356A 1950-1959 105-000
-
Heating air supply 356, 356A 1950-1959 202-015
-
Air cooling / Heating / Old version 356B / 356C 1960-1965 105-000
-
Rubber / Heating air supply 356B / 356C 1960-1965 202-010
-
Heating air supply 356B / 356C 1960-1965 202-015
-
Heating air supply for (D) (S) 356B / 356C 1964- 202-020
-
Ventilation 356B / 356C 1960-65 813-000
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.
Monday-Friday: 8.30am - 5.30pm (GMT)
Saturday: Closed
Sunday: Closed