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Porsche > 997 (911) MK1 2005-2008 > 997 MK1 GT3 / GT3 RS 2007-09 > Engine Cooling > Coolant Hoses and Pipes (Rear engine cars) >

Coolant Hoses - Radiator Section

Coolant Hoses - Radiator Section

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DISPLAYING 1 to 4 (of 12 products)
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Coolant Bottom Hose Supply LEFT. Porsche 987 Boxster / 987C Cayman / 997 - 99710662105, 99710662103, 99710662104
2
Coolant Bottom Hose Supply LEFT. Porsche 987 Boxster / 987C Cayman / 997
Special Order item
99710662105
Product Information
Product Information
Coolant Bottom Hose Supply LEFT.
Connects from the engine coolant supply line to the left side radiator.

Fits:
Porsche 987.1 Boxster / S  2005 - 2008
Porsche 987.2 Boxster / S 2009 - 2012
Porsche 987C.1 Cayman / S 2006 - 2008

Porsche 987C.2  Cayman / S 2009 - 2012
Porsche 997 GT3 2007-2010
Porsche 997.1 Carrera 2 / 2S 2005 - 2008 CABRIO/COUPE
Porsche 997.2 Carrera 2 / 2S 2009 - 2010 CABRIO/COUPE

This product supersedes Porsche's old part numbers:
- 99710662103

Diagram ref no 9.



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Related, superseded, cross reference or alternative numbers for comparison.

99710662105
99710662105
99710662103
99710662104

The product you are viewing cross references to these numbers
Coolant Bottom Hose Supply LEFT. Porsche 987 Boxster / 987C Cayman / 997 - 99710662105, 99710662103, 99710662104 - URO-021195
5
Coolant Bottom Hose Supply LEFT. Porsche 987 Boxster / 987C Cayman / 997
99710662105/1
Product Information
Product Information

Coolant Bottom Hose Supply - Left 

Keep your Porsche's cooling system operating at peak efficiency with this OE Match Coolant Bottom Hose Supply Left, designed for selected Porsche 987 Boxster, 987C Cayman and 997 models. Manufactured to OE specifications, this premium replacement coolant hose provides the correct fit, flexibility and durability required to ensure reliable coolant circulation throughout the engine cooling system.

Fits:

  • Porsche Boxster 987 2.7L 2005-08/08
  • Porsche Boxster 987 S 3.2/3.4L 2005-08/08
  • Porsche Boxster 987 MKII 2.9L 2009-12
  • Porsche Boxster S 987 MKII 3.4L 2009-12
  • Porsche 997 MK1 Carrera 2 3.6L 2005-08
  • Porsche 997 MK1 Carrera 2S 3.8L 2005-08
  • Porsche 997 MK1 GT3 / GT3 RS 2007-09
  • Porsche 997 MKII Carrera C2 3.6L 2009-12
  • Porsche 997 MKII Carrera C4 3.6L 2009-12
  • Porsche 997 MKII Carrera C2S 3.8L 2009-12
  • Porsche 997 MKII GT3 / GT3 RS 2010-11
  • Porsche Cayman 2.7L 987C 2006-08
  • Porsche Cayman S 3.4L 987C 2005-08
  • Porsche Cayman 2.9L 987C MKII 2009-12
  • Porsche Cayman S / R 3.4L 987C MKII 2009-12

Diagram ref no 9

As a vital part of the cooling circuit, the lower supply hose carries coolant between major cooling components, helping regulate engine temperature and maintain optimum operating performance. Replacing worn or ageing coolant hoses is an important part of preventative maintenance and helps reduce the risk of coolant loss, overheating and expensive engine damage.

What Does the Coolant Bottom Supply Hose Do?

The left-hand coolant bottom supply hose forms part of the engine's coolant circulation system, allowing coolant to flow efficiently between the radiator and engine cooling circuit.

Its primary functions include:

  • Carrying coolant through the engine cooling system.
  • Maintaining consistent coolant circulation.
  • Helping regulate engine operating temperature.
  • Supporting efficient heat transfer from the engine to the radiators.
  • Maintaining correct cooling system pressure.
  • Helping prevent engine overheating.

A correctly functioning coolant hose is essential for reliable cooling performance in all driving conditions.

Why Do Coolant Hoses Fail?

Coolant hoses operate under constant heat, pressure and vibration. Over time they naturally deteriorate due to:

  • Continuous heat cycling.
  • Age-related hardening and cracking.
  • Internal coolant pressure.
  • Exposure to coolant additives and contaminants.
  • Engine vibration.
  • External abrasion from surrounding components.

As the hose ages it may become brittle, swell, soften or develop small leaks that gradually worsen over time.

When Should the Coolant Bottom Hose Be Replaced?

The coolant hose should be inspected during routine servicing and replaced whenever signs of deterioration are found, including:

  • Coolant leaks.
  • Cracked or perished rubber.
  • Bulging sections.
  • Soft or weakened hose walls.
  • Coolant staining around hose joints.
  • Damaged or corroded hose connections.

Many Porsche specialists recommend replacing ageing coolant hoses whenever the cooling system is being overhauled or when replacing the water pump, thermostat, radiators or expansion tank.



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

99710662105
99710662105
99710662103
99710662104

The product you are viewing cross references to these numbers
Coolant Bottom Hose Supply RIGHT. Porsche 987 Boxster / 987 Cayman / 997 - 99710662204, 99710662203 - URO-020666
5
Coolant Bottom Hose Supply RIGHT. Porsche 987 Boxster / 987 Cayman / 997
99710662204/1
Product Information
Product Information

Right Hand Radiator Feed Pipe

This right-hand radiator feed pipe is designed for Porsche 997 and 987 Boxster / Cayman models. It forms a vital part of the front-mounted cooling system, carrying coolant from the engine towards the radiator to ensure efficient heat dissipation.

Fits:

  • Porsche Boxster 987 2.7L 2005-08/08
  • Porsche Boxster 987 S 3.2/3.4L 2005-08/08
  • Porsche Boxster 987 MKII 2.9L 2009-12
  • Porsche Boxster S 987 MKII 3.4L 2009-12
  • Porsche 997 MK1 Carrera 2 3.6L 2005-08
  • Porsche 997 MK1 Carrera 2S 3.8L 2005-08
  • Porsche 997 MK1 GT3 2007-09
  • Porsche 997 MKII Carrera C2 3.6L 2009-12
  • Porsche 997 MKII Carrera C4 3.6L 2009-12
  • Porsche 997 MKII Carrera C2S 3.8L 2009-12
  • Porsche 997 MKII GT3 2010-11
  • Porsche Cayman 2.7L 987C 2006-08
  • Porsche Cayman S 3.4L 987C 2005-08
  • Porsche Cayman 2.9L 987C MKII 2009-12
  • Porsche Cayman S / R 3.4L 987C MKII 2009-12

Diagram ref no 10

With Porsche’s mid- and rear-engine layouts, coolant must travel long distances between the engine and front radiators. This makes the condition of coolant pipes critical to maintaining stable engine temperatures and preventing overheating.

What This Radiator Feed Pipe Does

The radiator feed pipe transports coolant from the engine to the front radiator on the right-hand side of the vehicle.

It helps:

• Maintain continuous coolant flow through the cooling system
• Transfer heat away from the engine to the radiator
• Support stable engine operating temperatures
• Ensure efficient cooling under all driving conditions
• Maintain proper pressure within the cooling circuit

Without a properly functioning feed pipe, coolant flow can be restricted or lost entirely.

Why Radiator Feed Pipes Fail

Over time, coolant pipes are exposed to heat, pressure and environmental conditions that lead to wear and failure.

Common causes include:

Corrosion (on metal sections)
 Exposure to moisture and road debris can lead to corrosion over time.

Cracking or splitting
 Plastic or rubber sections can become brittle and fail.

Seal and joint deterioration
 Connections can weaken, leading to leaks.

Age-related wear
 Long-term exposure to heat cycles reduces material strength.

Symptoms of a Failing Radiator Feed Pipe

• Coolant leaks under the vehicle
• Low coolant warning messages
• Engine running hotter than normal
• Visible corrosion or damage on the pipe
• Sweet coolant smell after driving

Replacing a worn or leaking pipe is essential to prevent overheating and engine damage.

Why You May Need to Replace This Pipe

Prevent Engine Overheating
 A properly functioning feed pipe ensures reliable coolant circulation.

Fix Coolant Leaks
 Replacing damaged pipes restores system pressure and eliminates leaks.

Maintain Cooling System Efficiency
 Ensures optimal heat transfer and engine performance.

Essential Preventative Maintenance
 Cooling system components should be inspected and replaced as they age.

Direct Fit Replacement
 Designed to match original Porsche specifications for correct fitment.



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

99710662204
99710662204
99710662203

The product you are viewing cross references to these numbers
Coolant Bottom Hose Supply RIGHT. Porsche 987 Boxster / 987C Cayman / 997 - 99710662204, 99710662203
4
Coolant Bottom Hose Supply RIGHT. Porsche 987 Boxster / 987C Cayman / 997
Special Order item
99710662204
Product Information
Product Information
Coolant Bottom  Hose Supply - RIGHT.

Fits:
Porsche 987 Boxster / S MKI & MKII 2005>>
Porsche 987C Cayman / S MKI & MKII 2006>>
Porsche 997 GT3 2007-2010
Porsche 997 Carrera 2/2S MKI & MKII 2005>> CABRIO/COUPE


This product supersedes Porsche's old part numbers:
- 997 106 622 03

Diagram ref no 10

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

99710662204
99710662204
99710662203

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 12 products)
1 2 3
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About Coolant Hoses - Radiator Section

Radiator Section Coolant Hoses – Mid & Rear-Engine Porsche Models

Radiator section coolant hoses are essential for managing engine temperature in mid and rear-engine Porsche models. These hoses circulate coolant between the engine and the radiator, ensuring consistent temperature control and preventing overheating under high-performance conditions.

At Design911, we stock a full range of genuine and manufacturer-quality radiator section coolant hoses specifically designed for mid- and rear-engine Porsche models such as the 911, Boxster, and Cayman. Each hose is built to factory specifications for perfect fitment, superior pressure tolerance, and reliable cooling system performance — ensuring your Porsche operates safely and efficiently on road or track.

What Do Radiator Section Coolant Hoses Do?

In Porsche’s mid- and rear-engine designs, coolant must travel a greater distance between the engine (located at the rear or middle) and the radiator (at the front). The radiator section hoses form part of this vital network, helping to:

  • Transport coolant efficiently from the engine to the front radiator.
  • Maintain optimal engine operating temperature for performance and longevity.
  • Regulate coolant flow through the entire system under varying loads.
  • Ensure consistent pressure and leak-free circulation.

These hoses are engineered to handle high thermal and mechanical stress, ensuring reliability even in extreme driving conditions.

Why Do Radiator Coolant Hoses Fail?

Due to their exposure to heat, pressure, and constant coolant flow, radiator section hoses can wear out over time. Common causes of failure include:

  • Material fatigue from heat cycles and pressure changes.
  • Cracks or splits in aging rubber or plastic connectors.
  • Corrosion or leaks around hose clamps and fittings.
  • Swelling or softening from prolonged coolant exposure.
  • Abrasion damage from rubbing against engine or chassis parts.

Symptoms of a failing coolant hose may include coolant leaks under the car, overheating, fluctuating temperature readings, or a low coolant warning light.

Why Replace Faulty Radiator Section Hoses?

A worn or leaking hose can cause coolant loss, overheating, and potential engine damage. Replacing aging hoses is an essential part of preventative maintenance — especially in mid- and rear-engine Porsche models, where efficient cooling is critical.

Benefits of replacement include:

  • Restored, leak-free coolant circulation.
  • Improved temperature control and system pressure.
  • Prevention of costly overheating and engine damage.
  • Manufacturer-quality materials for long-term reliability.

All replacement hoses in this range are constructed using reinforced, high-performance rubber compounds and precision-moulded fittings, ensuring durability, flexibility, and perfect compatibility with Porsche cooling systems.

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