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Heater hoses & pipes

DISPLAYING 1 to 9 (of 9 products)
Special Order item
99657276502
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Product Information
Grommet heater pipe. 

Fits:
Porsche 986 Boxster -1997 to 2004
Porsche 987 Boxster - 2005 to 2012
Porsche 987 Cayman - 2005 to 2012

Porsche 996 -1997 to 2005
Porsche 997 - 2005 to 2012

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Diagram ref no 8



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99657276502
99657276502
99657276501

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99757226300
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Product Information
Heater hose gasket for luggage compartment cooling. 

Fits:
Porsche 987.1 Boxster - 2005 to 2008
Porsche 987.2 Boxster - 2009 to 2012
Porsche 987C.1 Cayman - 2005 to 2008
Porsche 987C.2 Cayman - 2009 to 2012
Porsche 997.1 - 2005 to 2008
Porsche 997.2 - 2009 to 2012

For cars with Option Code
M575 - Luggage compartment cooling system

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Diagram ref no 7

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99757226300
99757226300

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99657226303
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Heater hose gasket for Right-hand drive cars (RHD).

Fits:
For Right-hand drive cars (RHD)
Porsche 986 Boxster 1998-04
Porsche 987.1 Boxster 2005-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.1 Cayman 2005-08
Porsche 987C.2 Cayman 2009-12
Porsche 996 1998-05
Porsche 997.1 2005-08
Porsche 997.2 2009-12

Diagram ref no 1

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99657226303
99657226303

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99657226302
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Heater hose gasket for left-hand drive cars (LHD).

Fits:
For left-hand drive cars (LHD)
Porsche 986 Boxster 1998-04
Porsche 987.1 Boxster 2005-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.1 Cayman 2005-08
Porsche 987C.2 Cayman 2009-12
Porsche 996 1998-05
Porsche 997.1 2005-08
Porsche 997.2 2009-12

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99657226302
99657226302

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99757255501
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Heater hose, Return.

Fits:
For RHD cars
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05
Porsche 996 GT3 1999-05
Porsche 986 Boxster 1997-05
Porsche 987.1 Boxster 2005-08
Porsche 987.2 Boxster 200-12
Porsche 987C.1 Cayman 2006-08
Porsche 987C.2 Cayman 2009-12
Porsche 997.1 Carrera 2005-08
Porsche 997.1 Turbo 2007-10
Porsche 997 GT3 2007-11
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13

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99657258505
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99757255301
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Product Information
Heater hose, Supply.

Fits:
For RHD cars
Porsche 986 Boxster 1997-04
Porsche 996 Boxster 1998-05

Porsche 987 Boxster 2005-08
Porsche 987.2 Boxster 2009-12

Porsche 987C Cayman 2006-08
Porsche 987C.2 Cayman 2009-12

Porsche 997.1 Carrera 2005-08
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13

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Diagram ref no 1



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99757255301
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98710621230
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Heater Hose – Porsche 987.2 Boxster / Cayman 2009–2012 – 98710621230

This replacement heater hose is designed for the cooling and cabin heating system. It carries engine coolant through the heater circuit, helping maintain reliable cabin heating and correct coolant circulation.

Fits

  • Porsche 987.2 Boxster 2.9L 2009–12.
  • Porsche 987.2 Boxster S 3.4L 2009–12.
  • Porsche 987C.2 Cayman 2.9L 2009–12.
  • Porsche 987C.2 Cayman S / Cayman R 3.4L 2009–12.

Diagram Ref No 19

What This Product Does

This hose provides a coolant connection within the heating circuit. Its role is to convey coolant through the connected system, allowing circulation associated with cabin heating. Although shown alongside the expansion tank and associated fittings, the supplied component is a hose, not a coolant reservoir.

Functions

  • Conveys coolant within the heater circuit.
  • Provides a connection between adjoining components.
  • Contains coolant along the hose connection when correctly installed.

Technical Details

  • Genuine Porsche component, part number 98710621230.
  • Diagram description: Heating hose.
  • Listed diagram quantity: 1.
  • Diagram application codes: A120, A121.
  • Applications include the supplied 987 MKII Boxster and 987C MKII Cayman variants.
  • Shown in the coolant-system assemblies for 987.2 Boxster / Boxster S and 987C.2 Cayman 2.9L / 3.4L, 2009–12.

Symptoms of Fault

  • Damp patches or dried deposits at hose joints.
  • A coolant odour following use.
  • Coolant level dropping repeatedly or a low-level warning.
  • Splits, swelling or hardened sections visible during inspection.
  • Abnormally high coolant temperature or escaping steam.
  • Weak cabin heating associated with insufficient coolant or trapped air.

These signs can have other cooling-system causes; inspect the hose and neighbouring connections before deciding which component needs replacement.

Why Replacement Matters

Repeated heating, internal pressure and movement can gradually degrade a coolant hose. Renewing a confirmed leaking or damaged component addresses the defective connection rather than relying on repeated coolant top-ups. Examine adjoining fittings, clamps and other hoses for deterioration while carrying out the repair. Follow the applicable Porsche workshop instructions for filling and bleeding after installation.

FAQs

Can leakage appear only after driving?
A small defect may become apparent as coolant temperature and system pressure increase, even if the connection appears dry during a cold inspection.

Do nearby connections need checking?
Inspect the mating fittings and clamps as well as the hose. Deposits around a joint do not establish which individual component is responsible.

How can slight coolant seepage be traced?
Pressure testing can help locate a leak that is difficult to identify visually.



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98710621230
98710621230

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99757246301
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Product Information
Hot air defroster pipe. Air guide hose Left side.

Fits:
Porsche 987 Boxster
Porsche 987.2 Boxster
Porsche 987C Cayman
Porsche 987C.2 Cayman
Porsche 997 Carrera / Turbo
Porsche 997.2 Carrera / Turbo

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Diagram ref no 5

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99757246301
99757246301

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99757259302
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Connecting piece – links the plastic ducting to direct airflow into the luggage compartment system.

Fits:
Models With Luggage Compartment Cooling System (PR 575)
Porsche 987 Boxster 2005-12
Porsche 987-2 Cayman 2009-12
Porsche 997-2 Carrera 2009-12

Diagram ref. 8.

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DISPLAYING 1 to 9 (of 9 products)
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About Heater hoses & pipes

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.       

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