Heater flap box. Porsche 911 / 930 1987-89 Stainless Steel SET OF 2  ❭  91121101000

Heater Flap Box, Long Version.
Stainless Steel. Left & Right SET OF 2
G50 Cars Only
The OE Match Heater Flap Box, Long Version is a high-quality replacement, designed to restore the proper operation of the heating system on compatible classic Porsche models. Manufactured to OE-style specifications, this long-version heater flap box controls the flow of heated air from the heat exchangers into the vehicle's cabin, providing reliable heating and windscreen demisting.

Fits:

• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)  

Please note the flaps don't come with holes to accommodate caloric sensor. You may need to drill the holes for the rivets.

Located within the vehicle's heating system, the heater flap box uses an internal flap mechanism to direct or divert warm air as required. Over time, exposure to moisture, road debris, heat, and corrosion can cause the housing or flap mechanism to deteriorate, affecting heating performance and air control. This OE Match replacement restores the original functionality and factory appearance, making it ideal for both routine repairs and restoration projects.  

What This Product Does:

• Controls the flow of heated air from the heat exchangers.
• Directs warm air into the cabin when heating is selected.
• Diverts airflow when cabin heat is not required.
• Supports efficient windscreen demisting and defrosting.
• Helps maintain comfortable cabin temperatures.
• Restores correct operation of the Porsche heating system.
• Replaces a corroded, seized, or damaged original heater flap box.

Symptoms Of Wear Or Failure:

• Poor or inconsistent cabin heating.
• Reduced airflow from the heating system.
• Heat remaining on when switched off.
• Little or no warm air reaching the cabin.
• Heater flap sticking or failing to operate.
• Corrosion or rust on the heater flap box.
• Seized or stiff flap mechanism.
• Air leaks around the heater control assembly.
• Excessive rattling or vibration from the flap box.
• Visible deterioration or damage to the housing.

Why Replacement Matters:

• A faulty heater flap box can significantly reduce the effectiveness of your Porsche's heating and ventilation system, making the vehicle less comfortable to drive in colder weather and reducing the ability to demist or defrost the windscreen. A seized or damaged flap may also prevent accurate control of cabin temperature, leaving the heater permanently on or off.
• Replacing a worn heater flap box restores proper airflow management, improves heating efficiency, and helps maintain clear visibility during cold or damp conditions. It also prevents unwanted air leaks within the heating system and contributes to the reliable operation of the entire heating assembly. An OE Match replacement ensures the correct fit, dependable performance, and authentic appearance expected when maintaining or restoring a classic Porsche.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91121101000

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