Engine to heat exchanger hose, LEFT 458mm X 60mm. Porsche 911 / 914  ❭  90121119501

Engine to heat exchanger hose, brown paper/alu, LEFT 458mm X 60mm
This OE Match engine to heat exchanger hose is a replacement left-side heater air hose for Porsche 911 and 914 models. Measuring 458 mm x 60 mm, it is designed to match the original-style fitment and function, helping restore correct airflow between the engine and heat exchanger system.

Fits:
Porsche 911/911S/ Carrera 3.0 / 911SC 1974 - 1983
Porsche 914-6 1970 - 1976

This product supersedes Porsche's old part numbers: 90121119500

Diagram ref no. 10

The engine to heat exchanger hose carries warm air through the heating system, connecting the engine-side heater ducting to the heat exchanger area. A correctly fitted hose helps maintain proper cabin heating, demisting performance, and air distribution through the classic Porsche heating system.

Functions
•  Replaces the left-side engine to heat exchanger hose
•  Connects the engine heater ducting to the heat exchanger system
•  Supports warm air transfer through the heating circuit
•  Helps maintain cabin heating and windscreen demisting performance
•  Replaces split, crushed, brittle, missing, or heat-damaged original hoses
•  Supports correct heater system operation and airflow
•  OE Match replacement for classic Porsche heater system restoration.

Why Replace This Part?
Heater air hoses are exposed to heat, vibration, age, moisture, and engine bay conditions. Over time, the hose can split, crush, collapse, harden, fray, or become detached. A damaged hose can reduce heating performance, cause poor demisting, allow air leaks, or leave the heating system incomplete. Replacing the hose helps restore correct airflow and reliable heater operation.

When to Replace This Part
•  The hose is split, crushed, brittle, torn, or missing
•  Cabin heating output is weak or uneven
•  Windscreen demisting performance is poor
•  Air leaks are present around the heater hose connections
•  The heat exchanger or heater ducting is being serviced
•  Engine bay heater hoses are being replaced during restoration
•  The vehicle is undergoing Porsche 911 or 914 heating system refurbishment.

Where it fits on the car
This hose fits on the left side of the engine to heat exchanger heating system on Porsche 911 and 914 models. It connects the engine-side heater ducting to the heat exchanger area according to the factory heater layout.

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Related, superseded, cross reference or alternative numbers for comparison.

90121119501

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