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Radiator Top / Bottom Hoses
Coolant hoses link the engine, radiators and associated pipework so coolant can circulate and help keep operating temperatures within the intended range. A matched kit provides the key radiator hose pieces needed in one package for a consistent renewal of this part of the system.
Fits
Porsche 955 Cayenne S 4.5L V8 2003 – 2006
Porsche 955 Cayenne Turbo 4.5L 2003 – 2006
Porsche 955 Cayenne Turbo S 4.5L 2006>>
Diagram ref no 9, 10 and 11
Functions:
• Route coolant between engine and radiators
• Support stable operating temperatures
• Help maintain coolant pressure integrity in the radiator circuit
• Group related hose parts for a coordinated replacement
Why Replacement Matters
Cooling system hoses and pipes age with heat cycles, pressure and coolant exposure. Rubber can harden or soften, plastic fittings may fatigue, and joints can begin to seep, particularly on older Cayenne models. Replacing ageing or suspect radiator hoses as a kit helps restore consistent coolant flow and pressure, reduces the risk of leaks developing at different times, and supports reliable temperature control. Proactive renewal is often chosen after signs of staining around joints, a persistent coolant smell or small leaks following hot use.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
WATERPIPE955T
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Radiator water / coolant and pipe kit
This complete cooling system kit includes a direct-fit MAHLE radiator along with both primary coolant hoses. Designed
to work together as a matched set, the kit ensures reliable engine cooling and
long-term durability. By replacing the radiator and hoses at the same time, you
eliminate weak links in the system and restore the cooling circuit to factory
performance.
Fits:
Porsche Cayenne S 4.5L V8 2003-06
Porsche Cayenne Turbo 4.5L 2003-06
Porsche Cayenne Turbo S 4.5L 2006>>
What the Products Do
- Radiator: Transfers heat from the coolant to outside air, keeping
engine temperatures in the safe operating range.
- Coolant Hoses: Carry coolant between the radiator and engine, maintaining circulation under pressure and high heat.
Together, they form the backbone of the engine’s cooling system.
Symptoms of Failure
- Rising engine temperature or overheating
- Coolant leaks from the radiator or hoses
- Bulging, cracked, or soft hoses
- Coolant smell in or around the vehicle
- Low coolant levels or frequent top-ups
- Visible corrosion, cracks, or staining around the radiator core or end tanks
Common Reasons for Failure
- Age
& Wear: Plastic radiator tanks and rubber hoses degrade over time
due to heat cycles and pressure.
- Coolant
Quality: Old or incorrect coolant accelerates corrosion and hose
breakdown.
- Contamination:
Oil or debris in the cooling system can weaken rubber hoses.
- Vibration & Pressure: Constant stress causes cracks, leaks, or weak points to form.
Why Replace Together?
Replacing only the radiator or just the hoses can leave old
components under new stress, often causing premature failure.
By installing a
complete kit:
- You restore full cooling efficiency.
- You reduce the risk of breakdowns and costly engine damage.
- You save on labour costs compared to doing each part separately.
- You gain peace of mind knowing your cooling system is refreshed and reliable.
Ideal For: Preventive maintenance, resolving overheating issues, or as a long-term solution when refreshing the vehicle’s cooling system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
RADKIT955T.MAH
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
This radiator water / coolant and pipe kit is a replacement cooling system kit for Porsche 955 Cayenne S and Cayenne Turbo models. It includes OE Match radiator water / coolant component together with related OE Match coolant pipes required for cooling system service or repair.
Fits:
Porsche 955 Cayenne S 4.5L V8 2003 - 2006
Porsche 955 Cayenne Turbo 4.5L 2003 - 2006
Porsche 955 Cayenne Turbo S 4.5L 2006>>
Diagram ref no 9, 10, 11 + Radiator
The kit helps restore correct coolant flow through the front cooling system. The radiator water / coolant component and pipes work together to carry coolant between the engine cooling circuit and radiator area, helping regulate engine temperature and maintain reliable cooling performance.
Kit Contents
1 x OE Match Radiator water / coolant component
1 x OE Match Coolant pipe, Supply
1 x OE Match Coolant pipe, Return
2 x Genuine Porsche Radiator Coolant Hose Clamps
Functions
• Replaces key radiator water / coolant system components
• Includes coolant pipes for front cooling system service
• Helps maintain correct coolant flow and circulation
• Supports stable engine operating temperature
• Helps prevent coolant leaks from aged or damaged pipes
• Suitable for cooling system repair or preventative maintenance
• OE Match replacement kit for Porsche 955 Cayenne cooling service.
Why Replace This Kit?
Radiator and coolant pipe components are exposed to heat cycles, coolant pressure, vibration, road dirt, corrosion, and age. Over time, pipes can crack, corrode, leak, block, or suffer damaged connections, while radiator-related components can become weak or inefficient. Replacing these parts together helps restore reliable coolant flow and reduces the risk of overheating or coolant loss.
When to Replace This Kit
• Coolant leaks are present around the radiator or pipe area
• Coolant pipes are cracked, corroded, swollen, brittle, or damaged
• Engine temperature is unstable or overheating is present
• Cooling system pressure loss is being investigated
• Radiator or front cooling system service is being carried out
• Preventative cooling system maintenance is required
• The vehicle is undergoing Porsche Cayenne S or Cayenne Turbo restoration.
Where it fits on the car
This kit fits within the radiator water / coolant pipe system on Porsche 955 Cayenne S and Cayenne Turbo models. It forms part of the engine cooling circuit and front radiator coolant routing.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
RADKIT955T.OEM
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Genuine Porsche OE radiator coolant hose clamp B51x12 for Porsche 955 Cayenne S and 955 Cayenne Turbo models. This original Porsche coolant hose clamp is used within the radiator / cooling hose system, helping secure coolant hoses correctly and maintain a reliable seal under cooling system pressure.
Sold individually, 2 required
Fits:
Porsche 955 Cayenne S 4.5L V8 2003 - 2006
Porsche 955 Cayenne Turbo 4.5L 2003 - 2006
Porsche 955 Cayenne Turbo S 4.5L 2006>>
Diagram ref no 10
This clamp is used on selected Porsche Cayenne 955 cooling system hose connections.
What This Part Does / Functions
• Secures radiator and coolant hoses in position
• Helps maintain a tight seal at hose connection points
• Prevents coolant leaks caused by loose or weakened clamps
• Supports correct cooling system pressure retention
• Helps maintain coolant flow through the radiator circuit
• Provides correct OE Porsche clamp size and fitment
• Replaces a corroded, weakened, damaged or missing original clamp
• Supports reliable engine cooling system operation.
Why Replace This Part?
Coolant hose clamps are exposed to heat cycles, coolant, moisture, road debris and engine bay vibration. Over time, a clamp can corrode, weaken, lose tension or become damaged during hose removal. A poor clamp can allow coolant seepage or hose movement, which may lead to coolant loss, low coolant warnings or overheating. Replacing it with a Genuine Porsche OE radiator coolant hose clamp helps ensure the hose is secured using the correct factory-specified clamp for the application.
When to Replace This Part
• When replacing radiator coolant hoses
• If the existing clamp is corroded, loose or damaged
• If coolant seepage is present at the hose connection
• During radiator, expansion tank or cooling system repairs
• If the original clamp has lost tension
• If the clamp was damaged during removal
• During preventative cooling system overhaul
• When restoring the vehicle with correct Genuine Porsche hardware.
Where It Fits on the Car
This clamp fits within the engine cooling system / radiator hose assembly. It is used to secure coolant hose connections at the radiator, expansion vessel or related water hose pipework depending on the specific Cayenne application.
Correct positioning is important to ensure the hose seats properly and seals without damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95551240400
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 955 Cayenne S - 2003 to 2006
Click 'Zoom in' for large parts diagram.
Diagram ref no 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95510623950
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 955 Cayenne S - 2003 to 2006
Porsche 955 Cayenne turbo - 2003 to 2006
Diagram ref no 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95510623910
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Fits:
Porsche 955 Cayenne S - 2003 to 2006
Porsche 955 Cayenne turbo - 2003 to 2006
Click 'Zoom in' for large parts diagram.
Diagram ref no 11
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95510623800
The product you are viewing cross references to these numbers
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
Shop Securely
12 Month Warranty
Worldwide Delivery
Radiator Top & Bottom Hoses – Reliable Cooling for Porsche Performance
Radiator top and bottom hoses are vital components of your Porsche’s cooling system, responsible for transporting coolant between the radiator and the engine. The top hose carries hot coolant from the engine to the radiator for cooling, while the bottom hose returns the cooled fluid back to the engine, maintaining optimal operating temperatures for performance, efficiency, and reliability.
At Design911, we offer a full range of genuine and manufacturer-quality radiator top and bottom hoses for Porsche models including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each hose is precision-engineered for perfect fitment, high pressure tolerance, and exceptional heat resistance — ensuring reliable cooling under the most demanding driving conditions.
What Do Radiator Top and Bottom Hoses Do?
Coolant hoses are the lifelines of your Porsche’s cooling
system, and the radiator hoses perform the following key functions:
- Carry
coolant between the radiator and the engine.
- Regulate
engine temperature for consistent performance.
- Maintain
coolant pressure throughout the cooling circuit.
- Prevent overheating by ensuring efficient heat transfer.
Both the top and bottom hoses are designed to withstand high heat, vibration, and coolant pressure, providing dependable performance in every driving scenario.
Why Do Radiator Hoses Fail?
Over time, radiator hoses deteriorate due to heat, pressure,
and exposure to coolant. Common causes of hose failure include:
- Rubber
cracking or hardening from continuous heat cycles.
- Swelling
or soft spots due to coolant chemical breakdown.
- Leaks
at hose ends or clamps from pressure loss.
- Abrasion
damage caused by engine vibration or contact.
- Age-related material fatigue, especially in older vehicles.
Symptoms of hose failure include coolant leaks, visible cracks or bulges, fluctuating engine temperature, or a noticeable coolant smell in the engine bay.
Why Replace Faulty Radiator Hoses?
A leaking or weakened radiator hose can lead to overheating, coolant loss, and potential engine damage. Replacing these hoses as part of routine maintenance ensures consistent cooling performance and reliability.
Benefits of replacement include:
- Restored coolant flow and temperature stability.
- Prevention of leaks and overheating.
- Improved cooling system pressure and performance.
- Manufacturer-quality materials for long-term durability.
All radiator hoses in this range are made using reinforced, high-grade rubber and polymer compounds, designed to meet or exceed factory specifications for heat resistance, flexibility, and longevity.
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