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Coolant Hoses - Centre Section

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DISPLAYING 1 to 16 (of 22 products)
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99710655103
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Connector sleeve. Porsche 987 Boxster / 987C Cayman / 997. Need 2 of these, one for each side 

porsche

Fits:
Porsche 987 Boxster / S 2005>> MKI & MKII
Porsche 987C Cayman / S 2006>> MKI & MKII
Porsche 997 Carrera 2005>> MKI & MKII (Coupe / Cabrio)
Porsche 997 Turbo/GT2 MKI & MKII 2007>>
Porsche 997 GT3 2007>>

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Diagram ref no 28.

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99710655103
99710655103

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99710655103/1
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Connector sleeve. Porsche 987 Boxster / 987C Cayman / 997   Need 2 of these one for each side 

oematch

Fits:
Porsche 987 Boxster / S 2005>> MKI & MKII
Porsche 987C Cayman / S 2006>> MKI & MKII
Porsche 997 Carrera 2005>> MKI & MKII (Coupe / Cabrio)
Porsche 997 Turbo/GT2 MKI & MKII 2007>>
Porsche 997 GT3 2007>>

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Diagram ref no 28.

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99710655103
99710655103
997.106.551.03

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Special Order item
99710672307
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Product Information
Coolant hose.

porsche

Fits:
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997

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Diagram ref no 3

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99710672307
99710672307
99710672306
99710672305
99710672304

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99710672307/1
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Product Information
Coolant hose.

oematch

Fits:
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997

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Diagram ref no 3

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99710672307
99710672307
99710672306
99710672305
99710672304

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99710672803
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Product Information
Coolant return hose, LEFT.

porsche

Fits:
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997

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Diagram ref no 31

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99710672803
99710672803

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99710672803/1
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Coolant return hose, LEFT

oematch

Fits:
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997

Click 'Zoom in' for large parts diagram.
Diagram ref no 31

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99710672803
99710672803

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Special Order item
99710662403
Product Information
Product Information
Coolant return hose, RIGHT

porsche

Fits:
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2006-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12

Porsche 997.1 Carrera 2005-08
Porsche 997.1 Turbo / GT3 2007-08

Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo / GT3 2009-13

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Diagram ref no 32



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99710662403
99710662403

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99710662403/1
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Product Information
Coolant return hose, RIGHT.

oematch

Fits:
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2006-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12

Porsche 997.1 Carrera 2005-08
Porsche 997.1 Turbo / GT3 2007-08
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo / GT3 2009-13

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Diagram ref no 32

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99710662403
99710662403

The product you are viewing cross references to these numbers
Special Order item
99710662303
Product Information
Product Information
Coolant supply hose, LEFT.

porsche

Fits:
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2006-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12

Porsche 997.1 Carrera 2005-08
Porsche 997.1 Turbo / GT3 2007-08

Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo / GT3 2009-13


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Diagram ref no 29

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99710662303
99710662303
99710662703
99710672803
99710662403

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99710662303/1
Product Information
Product Information
Coolant supply hose, LEFT.

oematch

Fits:
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2006-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12

Porsche 997.1 Carrera 2005-08
Porsche 997.1 Turbo / GT3 2007-08
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo / GT3 2009-13

Click 'Zoom in' for large parts diagram.
Diagram ref no 29

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99710662303
99710662303

The product you are viewing cross references to these numbers
Special Order item
99710662703
Product Information
Product Information
Coolant supply hose, RIGHT

porsche

Fits:
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2006-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12

Porsche 997.1 Carrera 2005-08
Porsche 997.1 Turbo / GT3 2007-08

Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo / GT3 2009-13

Click 'Zoom in' for large parts diagram.
Diagram ref no 30.



Related reference numbers
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99710662703
99710662703

The product you are viewing cross references to these numbers
99710662703/1
Product Information
Product Information
Coolant supply hose, RIGHT

oematch

Fits:
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2006-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.2 Cayman 2009-12

Porsche 997.1 Carrera 2005-08
Porsche 997.1 Turbo / GT3 2007-08

Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo / GT3 2009-13

Click 'Zoom in' for large parts diagram.
Diagram ref no 30.



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99710662703
99710662703

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Special Order item
99710671103
Product Information
Product Information
Coolant Supply Hose.

porsche

Fits:
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997

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Diagram ref no 1

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99710671103
99710671103
99710671102
99710671101

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99710671103/1
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Product Information
Coolant Supply Hose.

oematch

Fits:
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997

Click 'Zoom in' for large parts diagram.
Diagram ref no 1

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99710671103
99710671103
99710671102
99710671101

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99710675104
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Product Information
Distributor Return Line.

porsche

Fits:
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997

Click 'Zoom in' for large parts diagram.
Diagram ref no 9

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99710675104
99710675104

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99710675104/1
Product Information
Product Information
Distributor Return Line.

oematch

Fits:
Porsche 987 Boxster
Porsche 987C Cayman
Porsche 997

Click 'Zoom in' for large parts diagram.
Diagram ref no 9

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99710675104
99710675104

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DISPLAYING 1 to 16 (of 22 products)
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About Coolant Hoses - Centre Section

Coolant Hoses – Centre Section | Reliable Cooling for Porsche Performance

The centre section coolant hoses are vital components of your Porsche’s engine cooling system, responsible for circulating coolant between the front and rear of the vehicle. These hoses maintain consistent coolant flow through the radiator and engine, ensuring optimal temperature regulation and preventing overheating — essential for both performance and longevity.

At Design911, we supply a full range of genuine and high-quality coolant hoses in the centre section for Porsche models including 911, Boxster, Cayman. Each hose is engineered to deliver factory-accurate fitment, high heat resistance, and long-lasting durability under the extreme pressures of Porsche’s high-performance cooling systems.

What Do Centre Section Coolant Hoses Do?

Coolant hoses act as the lifelines of your Porsche’s cooling system. The centre section hoses connect key parts of the cooling circuit, helping to:

  • Transfer coolant between the engine, radiator, and water pump.
  • Regulate engine temperature during all driving conditions.
  • Maintain system pressure for consistent cooling performance.
  • Prevent overheating and protect the engine from thermal stress.

Their design ensures smooth, efficient coolant flow — especially important in Porsche models with long mid- or rear-engine coolant routing systems.

Why Do Coolant Hoses Fail?

Over time, coolant hoses are exposed to constant pressure, high temperatures, and fluid corrosion. This can lead to:

  • Rubber degradation or cracking from heat cycling.
  • Coolant leaks due to worn hose ends or clamps.
  • Swelling or soft spots caused by chemical breakdown.
  • Abrasion damage from contact with nearby components.
  • Age-related hardening, reducing flexibility and sealing strength.

Common signs of hose failure include visible cracks, coolant puddles under the car, engine temperature fluctuations, or low coolant levels.

Why Replace Faulty Coolant Hoses?

A weakened or leaking coolant hose can quickly lead to overheating, engine damage, or complete coolant loss. Replacing worn hoses ensures your Porsche’s cooling system operates safely and efficiently.

Benefits of replacement include:

  • Restored, leak-free coolant circulation.
  • Improved temperature control and engine protection. 
  • Prevention of overheating and costly repairs.
  • Manufacturer-quality construction and precision fit.

All hoses in this range are made from high-performance rubber compounds and reinforced materials, designed to meet exacting standards for flexibility, strength, and heat resistance.

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