Heater hoses & pipes
- 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)

Fits:
Porsche 911 1978-85 LHD Cars
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Diagram ref no 4
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Related, superseded, cross reference or alternative numbers for comparison.
91157318100
The product you are viewing cross references to these numbers
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L

Fits:
Porsche 911 1978-89 LHD Cars
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Diagram ref no 3
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Related, superseded, cross reference or alternative numbers for comparison.
91157317300
The product you are viewing cross references to these numbers
- 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

Fits:
For LHD cars
Porsche 911 1977-85
Porsche 911 Turbo 1977
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Diagram ref no 15
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Related, superseded, cross reference or alternative numbers for comparison.
91157108500
The product you are viewing cross references to these numbers
- 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 1975-1977 3.0L Turbo (930)

Fits:
Porsche 911 Carrera (1987 to 1989)
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Diagram ref no 31
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Related, superseded, cross reference or alternative numbers for comparison.
91157311501
The product you are viewing cross references to these numbers
- Porsche 911 1987-1989 3.2L G50

Fits:
Porsche 911 Carrera (1986 - 1987)
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Diagram ref no 28
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Related, superseded, cross reference or alternative numbers for comparison.
91157232500
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50

Fits:
Porsche 911 1984-86
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Diagram ref no 2
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Related, superseded, cross reference or alternative numbers for comparison.
91157311700
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L

Fits:
Porsche 911 1984-89
Diagram ref no 14
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Related, superseded, cross reference or alternative numbers for comparison.
99970307740
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Appox 1 meter long 60mm Diameter

Fits:
Porsche 911 1975-83
Also used on Pre >>1973 911's in the heater system
Click 'Zoom in' for large parts diagram.
Diagram ref no 13
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Related, superseded, cross reference or alternative numbers for comparison.
91121152201
The product you are viewing cross references to these numbers
- 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

Fits:
Porsche 911 1975-83
Also used on Pre >>1973 911's in the heater system
Click 'Zoom in' for large parts diagram.
Diagram ref no 13
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91121152201
The product you are viewing cross references to these numbers
- 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
Appox 1.1meter long 60mm diameter.

Fits:
Porsche 911 1975-83
Also used on Pre >>1973 911's in the heater system
Click 'Zoom in' for large parts diagram.
Diagram ref no 13
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91121152201
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC

Fits:
Porsche 911 1973-89
Click picture for large parts diagram.
Diagram ref No 12
Price is for each clamp.
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Related, superseded, cross reference or alternative numbers for comparison.
99951234901
The product you are viewing cross references to these numbers
- 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)

Fits:
Porsche 911 1965-86
Porsche 911 Turbo 3.0L / 3.3L 1975-86
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Diagram ref no 2
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90121105
The product you are viewing cross references to these numbers
- 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 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)

Fits:
Porsche 911 1965-86
Porsche 911 Turbo 3.0L / 3.3L 1975-86
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
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Related, superseded, cross reference or alternative numbers for comparison.
90121105
The product you are viewing cross references to these numbers
- 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 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Left or right side

Fits:
Porsche 911 1965-86
Porsche 911 Turbo 3.0L / 3.3L 1975-86
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
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90121105
The product you are viewing cross references to these numbers
- 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 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Rubber sealing ring / gasket used in the HVAC/heater/ventilation system of classic 911 / 912 cars. Its sealing points where heater/vent hoses pass through body or bulkhead. Ideal when refurbishing HVAC ducts, replacing heater hoses, restoring classic 911/912 ventilation and heat systems.
Sold each. 2 required per vehicle.
Fits:
Porsche 911 1965 - 1989 all models
Diagram ref no 18
Because over decades the original sealing rings often become brittle, hard, compressed or cracked (due to heat cycles, age, vibration, exposure to cabin air, moisture and dust), they lose their ability to seal properly.
This can lead to:
• Unwanted air leaks or drafts into cabin
• Water or dust ingress into the interior or into heater ducts
• Poor heating or ventilation performance
• Increased cabin noise, wind-noise or fumes entering cabin (especially on vehicles with engine-bay to cabin vents).
Replacing with a correct-spec sealing ring ensures a tight, flexible seal that restores proper HVAC function, occupant comfort, and helps preserve the integrity of the car’s interior and ventilation system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90157291301
The product you are viewing cross references to these numbers
- 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)
Fits:
Porsche 911 1965-89 all models
Diagram ref no 34
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90157291301
The product you are viewing cross references to these numbers
- 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)
-
blower engine 911 SC 1978-83 108-10
-
exhaust system 911 SC 1978-83 202-00
-
heating air supply 911 1978-83 202-20
-
ventilation heating system - 1 - 911 1978-83 813-00
-
cooling air duct, control switch 911 1978-83 813-10
-
heating air supply for 911 T/E/S 1970 ONWARDS and 911 T-V, CARRERA 2.7, 911 T-K 1972 ONWARDS 202-00
-
exhaust system for 911 T/E/S 1972 ONWARDS and 911 T-V, CARRERA 2.7, 911 T-K 1970-73 202-05
-
additional blower 911 CARRERA 930.20/25/26 1987-89 108-10
-
Additional blower 911 CARRERA 930.20/21/26 1984-86 108-10
-
heating air supply 911 1984-86 202-20
-
ventilation heating system - 1 - 911 1987-89 813-00
-
ventilation heating system - 2 - 911 1987-89 813-01
-
cooling air duct Left-Hand Drive Cars 911 1987-89 813-10
-
Interior equipment doors 911 1970-73 807-10
-
ventilation heating system - 1 - 911 1984-86 813-00
-
ventilation heating system - 2 - 911 1984-86 813-01
-
additional blower 911 1984-86 813-02
-
Ventilation and heating 911 1970-73 813-00
-
cooling air duct left-hand drive 911 1984-86 813-10
-
air conditioner evaporator housing complete with air duct not for (USA) 911 1970-73 813-50
-
Air conditioner electrical components accessories not for (USA) 911 1970-73 813-70
-
Additional blower 911 1975 ONWARDS 108-10
-
Exhaust system K-JETRONIC 911.83 Cars 1974 ONWARDS 202-00
-
Exhaust system K-JETRONIC 1975 ONWARDS 202-10
-
Heating air supply 911 1974-77 202-30
-
interior equipment: doors 911 1987-89 807-10
-
interior equipment doors 911 1984-86 807-10
-
Ventilation heating system - 1 - 911 UPTO 1976 813-00
-
ventilation heating system - 2 - 911 1977 ONWARDS 813-05
-
air cooling, air duct and engine cover for (S)(D) 912 1965-69 105-10
-
heating air supply 911 1965-69 202-00
-
exhaust system 911 1965-69 202-10
-
interior equipment doors 911 1969 ONWARDS 807-15
-
ventilation heatin 911 1969 onwards 813-15
-
evaporator housing, air conditioner - complete with air duct - for 911 E/S/T 1969 onwards 813-75
-
air conditioner, electrical components, accessories 911 E/S/T 1969 onwards 813-95
-
exhaust system 911 TURBO 1975-77 202-00
-
turbocharger and wastegate 911 TURBO 1975-77 202-20
-
heating air supply 911 TURBO 1975-77 202-30
-
ventilation heating system - 1 - 911 TURBO upto 1976 813-00
-
ventilation heating system - 2 - 911 TURBO 1977 onwards 813-05
Porsche Heater Hoses & Pipes | Reliable Coolant Flow & Cabin Heating Efficiency
Heater hoses and pipes are essential components in your Porsche’s heating and cooling system. They carry heated coolant from the engine to the heater core, enabling warm air circulation throughout the cabin. Without properly functioning hoses and pipes, the heating system cannot deliver consistent temperature control or maintain efficient engine cooling.
At Design911, we supply premium heater hoses and coolant pipes that meet or exceed original engineering standards. Constructed from high-quality rubber, aluminium, or reinforced composite materials, these components ensure leak-free performance, excellent heat resistance, and long-term durability.
Whether you’re restoring a classic 911 or maintaining a modern Porsche with advanced climate control systems, our heater hoses and pipes provide the precision, fitment, and performance required for dependable heating and cooling.
What Do Heater Hoses & Pipes Do?
Heater hoses and pipes form the circulation path that carries hot coolant from the engine to the heater core, allowing the HVAC system to provide warm air inside the cabin.
Core Functions:
- Transfer heated coolant to the heater core for cabin warming.
- Maintain proper coolant flow between engine and heating system.
- Regulate temperature and prevent air pockets in the system.
- Ensure efficient heat exchange for passenger comfort.
- Protect against coolant loss and overheating.
A properly functioning set of hoses and pipes is critical for both engine cooling performance and interior heating efficiency.
Why Do Heater Hoses & Pipes Fail or Degrade?
These components endure constant heat, pressure, and vibration. Over time, material fatigue and corrosion can lead to leaks or blockages.
Common Causes of Failure Include:
- Age-related cracking, swelling, or brittleness of rubber hoses.
- Corrosion or pinhole leaks in metal pipes.
- Coolant contamination or chemical degradation.
- Loose or damaged hose clamps causing leaks.
- Blockages from scale or debris restricting coolant flow.
When heater hoses or pipes fail, symptoms include coolant leaks, weak cabin heat, overheating, or a sweet smell of antifreeze inside the cabin.
Why Replace Your Porsche Heater Hoses & Pipes?
Replacing worn or damaged heater hoses and pipes restores proper coolant circulation, prevents leaks, and ensures stable heating and engine temperature control.
Key Benefits:
- Restores efficient coolant flow and cabin heating performance.
- Prevents leaks, overheating, and engine damage.
- Improves reliability and system pressure integrity.
- Resistant to heat, pressure, and corrosion for long lifespan.
- Direct-fit replacements for Porsche 911, Cayman, Boxster, Panamera, Macan, and Cayenne models.
- Ideal for maintenance, restorations, or performance upgrades.
It’s recommended to replace heater hoses and clamps during coolant service intervals to maintain maximum system reliability.
Highlights
- Precision-engineered Porsche heater hoses and coolant pipes.
- Constructed from high-quality, heat-resistant materials.
- Direct-fit replacements for Porsche models old and new.
- Designed for long-term resistance to pressure and corrosion.
- Ensures reliable heating and engine cooling performance.
- Ideal for restoration, servicing, and preventative maintenance.