Heater Tube Repair Set, Rear Chassis Side Member. Porsche 911 1965-73  ❭  90157202

Heater Tube Repair Set, Rear Chassis Side Member.
This Heater Tube is a direct replacement for Porsche early air-cooled 911/912 models. Designed to sit inside the longitudinal/frame member, this 2-piece tube assembly routes warm air from the engine’s heat exchangers through the chassis and into the interior heater system.

Fits:

• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)

Diagram Ref No 14 And 16

What This Product Does:

• They route warm air from the engine’s heater outlets through the car’s inner rocker / longitudinal frame members toward the front cabin heater system.
• Inside the sill/longitudinal structure, they form part of the air path that carries warmed air (generated by the heat exchangers on the engine) forward into the cabin ventilation ducts under the dash.
  
• Once the warm air reaches the front heater box area, it continues through other hoses and flaps to the vents, footwells and windscreen demisters.

Symptoms Of Wear Or Failure:

• Even with the heater turned on, you’ll get little to no warm air into the cabin because the tube is rusted through, leaking, or blocked.
  
• One side of the car may blow warmer than the other if only one tube is damaged (left or right).
  
• If the tube is crushed, collapsed, or internally corroded, airflow can be restricted, causing weak blower/heater output.
  
• Failed tubes can contribute to moisture buildup inside the longitudinal, which can cause musty smells and accelerate corrosion in the surrounding structure.
  
• Since these tubes help deliver warm air forward, failure often shows up as weak windscreen demist performance, especially in cold or wet weather.
  
  

Why Replacement Matters:

• Replacing a failed heater tube ensures that the cabin gets heated air as originally intended, improving driver comfort and safety in cooler weather.
• Rust and deterioration inside the frame member can worsen over time. A compromised tube may allow moisture and corrosion to spread, damaging surrounding components.
  
• For classic car restorations, keeping systems like the heating ductwork correct and complete helps preserve authenticity and value — especially important with vintage Porsches.

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Related, superseded, cross reference or alternative numbers for comparison.

90157202

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