Heating tube inside sill left/right. Porsche 911 1969 - 89  ❭  91157202502

Heating tube inside sill (left/right).
This Heater Tube Inside Sill is a Genuine Porsche OE component designed to route heated air through the inner sill section of classic air-cooled Porsche 911 models from 1969 to 1989. The heater tube carries warm air produced by the engine’s heat exchangers through the sill cavity toward the cabin ventilation system.

Fits:
Porsche 911 1969 - 1989

Diagram ref no 15

Function: Installed inside the vehicle’s sill structure, the tube forms a critical part of the classic 911 heating system. It channels heated air forward into the cabin ducting, supporting effective interior heating, windscreen demisting, and overall comfort in cooler conditions.

Over time, original heater tubes can degrade due to heat cycles, age, and corrosion, resulting in reduced airflow or heat loss before reaching the cabin. In severe cases, damaged ducting may allow unwanted fumes or debris into the heating system. Replacing the tube with a Genuine Porsche part restores factory heating efficiency, preserves originality, and ensures long-term reliability of the heating system.

Replace this heater tube if you notice:
• Weak or uneven heater output
•  Cracked, brittle, or collapsed ducting
•  Heat loss before air reaches the cabin
•  Unpleasant odours from the heating system
•  During restoration or refurbishment of the sill or heating system

Related reference numbers
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91157202502

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