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- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits:
Porsche 356A Carrera GT - 1956 to 1959
Porsche 356A Carrera GS - 1956 to 1959
For Carrera GT and GS models only
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
64421102
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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)
The OE MATCH Gasket for Heater Flap is a high-quality replacement sealing gasket designed for the heater flap assembly within the vehicle's heating and ventilation system. This gasket creates an effective seal between the heater flap and its housing, ensuring that warm air is directed correctly through the heating ducts and into the cabin.
Sold Each.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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)
Diagram Ref No 7
Manufactured to OE specifications, the gasket helps prevent unwanted air leakage, improves heater efficiency, and contributes to proper climate control performance. Made from durable materials resistant to heat, age, and environmental exposure, it is an essential component during heater flap refurbishment or restoration work, particularly on classic Porsche models.
What This Product Does:
- Provides a seal between the heater flap and housing assembly
- Prevents unwanted air leakage within the heating system
- Ensures efficient airflow through the heater ducts
- Helps maintain consistent cabin heating performance
- Supports proper operation of the vehicle's ventilation system
- Reduces heat loss within the heater control system
Symptoms Of Wear Or Failure:
- Reduced cabin heating performance
- Air leaks from the heater flap assembly
- Difficulty maintaining cabin temperature
- Poor airflow direction through heater vents
- Increased drafts entering the cabin
- Rattling or vibration from loose sealing materials
- Visible deterioration, cracking, or missing gasket material
- Reduced efficiency of the heating and ventilation system
Why Replacement Matters:
- Restores an effective air-tight seal within the heater system
- Improves heating efficiency and airflow control
- Reduces unwanted air leaks and heat loss
- Enhances overall cabin comfort
- Supports proper operation of the heater flap mechanism
- Helps maintain original HVAC system performance
- Prevents drafts and inconsistent heating
- Provides a professional finish during restoration or maintenance work
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91121129700
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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)
SET OF 2
Upgrade the durability and reliability of your classic Porsche's heating system with these OE Match Heater Flap Boxes in Stainless Steel, manufactured as a direct replacement. Designed for models not equipped with the G50 gearbox, these heater flap boxes retain the original fit and function while offering the added corrosion resistance of stainless steel construction.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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)
Heater flap boxes regulate the flow of warm air from the heat exchangers into the cabin, providing effective heating and windscreen demisting. Original mild steel units are prone to corrosion from moisture, road debris, and repeated heat cycles, which can cause the flap mechanism to seize or the housing to deteriorate. These stainless steel OE Match replacements provide a long-lasting solution, making them ideal for both regular maintenance and high-quality restoration projects.
What This Product Does:
- Control the flow of heated air from the heat exchangers.
- Direct warm air into the cabin when heating is selected.
- Divert airflow when cabin heat is not required.
- Support effective windscreen demisting and defrosting.
- Restore smooth operation of the heating control system.
- Provide improved corrosion resistance with stainless steel construction.
- Replace worn, corroded, or seized original heater flap boxes.
Symptoms Of Wear Or Failure:
- Poor or inconsistent cabin heating.
- Reduced airflow through the heating system.
- Heater remaining on or off regardless of control position.
- Seized or stiff heater flap mechanism.
- Corrosion or rust on the flap box housing.
- Air leaks around the heater flap assembly.
- Rattling or vibration from underneath the vehicle.
- Difficulty operating the heater controls.
- Visible holes or deterioration caused by corrosion.
- Damaged or missing heater flap boxes.
Why Replacement Matters:
- Faulty heater flap boxes reduce the efficiency of your Porsche's heating and ventilation system, affecting cabin comfort and limiting the ability to demist or defrost the windscreen. Corroded housings and seized flaps can also allow unwanted air leaks and prevent accurate temperature control.
- Replacing worn flap boxes restores proper airflow management and dependable heater operation while the stainless steel construction offers significantly greater resistance to corrosion than the original mild steel units. This helps extend service life, reduces future maintenance, and preserves the reliable performance and factory-style operation of the heating system, making these OE Match flap boxes an excellent upgrade for classic Porsche ownership and restoration.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90121100100
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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)
Heating Block Off Plates (Pair)
Complete your engine restoration or heater system
modification with this Heating Block Off Plate Kit, supplied as
a pair. These plates provide a secure seal for unused heater
outlets, helping maintain the correct airflow through the engine cooling
system.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- 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)
Replaces number 1 on diagram attached
On air-cooled Porsche engines, the engine cooling fan supplies air to both the engine cooling system and the cabin heating system via heat exchangers. When the heating system has been removed, modified or is no longer required, the unused heater outlets must be properly sealed. These block off plates prevent valuable cooling air from escaping, ensuring it is directed through the engine's cooling fins where it is needed most.
Manufactured to OE Match standards, these plates provide factory-style fitment and are ideal for heater delete conversions, competition vehicles, engine rebuilds and concours-quality restorations.
What Do Heating Block Off Plates Do?
Heating block off plates are designed to seal the heater duct outlets on the engine fan housing or associated heating components when the original heater system is no longer in use.
Their primary functions include:
- Preventing cooling air from escaping unused heater outlets
- Maintaining correct airflow across the engine cylinders and heads
- Improving cooling efficiency
- Preventing dirt, dust and debris entering unused heater duct openings
- Providing a clean, factory-style appearance within the engine bay
Correctly sealing unused heater outlets is particularly important on air-cooled engines, where efficient airflow is critical to maintaining stable operating temperatures.
Why Do Heating Block Off Plates Need Replacing?
Original block off plates, or the components they replace, can become damaged, corroded or distorted after decades of exposure to engine heat, moisture and road debris.
In many cases, older vehicles that have undergone heater delete conversions may have improvised blanking plates made from unsuitable materials, or the outlets may simply have been left open altogether. This allows cooling air to escape, reducing the efficiency of the engine cooling system.
Replacement is also recommended if the original plates are:
- Corroded or rusted
- Bent or distorted
- Poorly fitting
- Missing altogether
- Damaged during previous engine work
Installing correctly manufactured OE Match block off plates restores the engine bay to a professional standard while ensuring the cooling system operates as intended.
When Should They Be Replaced?
Heating block off plates should be installed or replaced
whenever:
- Performing a heater delete conversion
- Removing or modifying the original heating system
- Rebuilding the engine
- Restoring the engine bay
- Replacing damaged or corroded engine tinware
- Missing or incorrect blanking plates are discovered
Replacing worn or incorrect plates helps maximise cooling efficiency while improving the appearance and reliability of the engine compartment.
Porsche 911, 912 & 930 Heating & Engine Cooling Components
The air-cooled Porsche engine relies on carefully managed airflow to maintain safe operating temperatures. Every component of the cooling system, including engine tinware, ducting and heater outlet covers, plays an important role in directing cooling air exactly where Porsche intended.
When the heating system has been removed or modified, fitting correctly engineered block off plates helps prevent cooling air losses and ensures maximum airflow reaches the cylinders and cylinder heads.
Whether restoring a road car, preparing a competition vehicle or completing a detailed engine rebuild, replacing missing or damaged heating block off plates is a simple but important step towards maintaining engine efficiency and achieving a factory-quality finish.
Benefits of Replacing the Heating Block Off Plates
- Restores correct engine cooling airflow
- Prevents cooling air escaping through unused heater outlets
- Helps maintain stable engine operating temperatures
- Protects unused heater duct openings from dirt and debris
- Improves engine bay appearance
- Provides a factory-style finish
- Ideal for heater delete conversions and restoration projects
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91121129700
The product you are viewing cross references to these numbers