Heat exchanger heater flaps STAINLESS STEEL, set of 2. Porsche 911  ❭  90121100100

Heater Flap Boxes In Stainless Steel (Not For G50 Cars)
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

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