Coolant Hoses - Radiator Section

Genuine Porsche Radiator Coolant Hose Kit
This kit includes four genuine Porsche radiator coolant hoses and two coolant hose connectors, providing essential components for replacing worn, leaking or deteriorated radiator hose connections on both sides of the vehicle. The kit includes the left-hand and right-hand coolant supply and return hoses, helping maintain efficient coolant circulation between the engine cooling system and front radiators.

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 3.6L / 3.8L 2005 - 2008 CABRIO/COUPE
Porsche 997.2 Carrera 3.6L / 3.8L 2009 - 2012 CABRIO/COUPE

Diagram ref no 9, 10 & 11

Manufactured to Porsche's original specifications, these components provide precise fitment, durability and reliable performance under demanding operating temperatures and pressures.

Ideal for cooling system repairs, radiator maintenance or preventative servicing, this kit helps restore reliable engine cooling and maintain the original performance of your Porsche.

What Does This Kit Do? – Functions

• Efficient Coolant Circulation: Supports coolant flow between the engine and front radiators.
• Temperature Regulation: Helps maintain stable engine operating temperatures.
• Coolant Leak Prevention: Replaces deteriorated hoses and connections to help prevent coolant loss.
• Overheating Protection: Supports effective radiator cooling and heat dissipation.
• Secure Connections: Genuine Porsche connectors provide factory-correct hose connections.
• Original Fitment: Maintains Porsche factory cooling system specifications.

Why Replace These Parts?
Over time, radiator coolant hoses can become brittle, cracked or weakened due to constant heat exposure, coolant pressure and ageing. Damaged hoses or connectors may cause coolant leaks, reduced cooling efficiency and potentially serious engine overheating.

Replacing worn components with this genuine Porsche kit helps restore reliable coolant circulation, maintain secure cooling system connections and reduce the risk of unexpected cooling system failures.

When to Replace This Kit?

• Coolant Leaks: Visible coolant escaping from hoses or connections.
• Cracked Hoses: Hardened, brittle or deteriorated hose material.
• Swollen Hoses: Bulging or deformation caused by ageing or pressure.
• Engine Overheating: Rising engine temperatures associated with cooling system problems.
• Damaged Connectors: Cracked, worn or leaking coolant hose connections.
• Cooling System Repairs: During radiator replacement or major cooling system servicing.

Where Does It Fit on the Car?
Location: Front cooling system – left-hand and right-hand radiator hose assemblies.

The coolant hoses are installed within the front radiator cooling circuits, connecting the engine coolant supply and return pipework to the left and right radiators. The lower hoses carry coolant to the radiators, while the return hoses carry coolant away from the radiators through the cooling circuit. The two coolant hose connectors form part of the radiator hose connections, helping maintain secure assembly and proper coolant flow.

Fitting Positions:
Left-hand lower radiator coolant supply hose
Left-hand radiator coolant return hose
Right-hand radiator coolant return hose
Right-hand lower radiator coolant supply hose
Coolant hose connectors for the radiator assemblies

Parts Diagram References: No. 9, 10 & 11

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

RADHOSEKIT.997.OE

The product you are viewing cross references to these numbers

Radiator Coolant Hose Kit
Complete radiator coolant hose kit for selected Porsche 987 Boxster, 987 Cayman and 997 Carrera / GT3 models. This kit combines OE Match radiator coolant hoses with Genuine Porsche coolant hose connectors, providing the main components required to renew the relevant radiator hose connections within the cooling system. Ideal for cooling system repair, preventative maintenance or replacement of ageing, cracked, hardened or leaking coolant hoses and connectors.

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 3.6L / 3.8L  2005 - 2008 CABRIO/COUPE
Porsche 997.2 Carrera 3.6L / 3.8L  2009 - 2012 CABRIO/COUPE

Diagram ref no 9, 10 & 11

This kit contains four OE Match radiator coolant hoses together with two Genuine Porsche hose connectors.

Please Note: Three of the four pipes included in this kit do not come with clamps. You can reuse your existing clamps or purchase new genuine OEM clamps separately. When you add the kit to your basket, the recommended clamps will appear as suggested products, allowing you to easily add them to your order.

The hoses form part of the coolant circulation system between the engine and radiator circuit, while the connectors join the relevant hose sections together and help maintain a secure, sealed cooling system.

Supplying these components together makes the kit a practical option when carrying out a larger cooling system overhaul rather than replacing individual hoses separately.

What this kit does

• Replaces multiple radiator coolant hoses
• Includes two Genuine Porsche coolant hose connectors
  Includes two Genuine Porsche hose clamps
• Helps restore reliable coolant circulation
• Helps maintain cooling system pressure
• Supports stable engine operating temperatures
• Replaces ageing, hardened or leaking hose components
• Suitable for cooling system repair or refurbishment
• Combines OE Match hoses with Genuine Porsche connectors

Why Replace the Radiator Coolant Hoses?
Coolant hoses are continuously exposed to heat, cooling system pressure and repeated temperature cycles. Over time, rubber hoses can harden, crack, swell or deteriorate, while connectors can become damaged or develop sealing issues.

Common signs of ageing cooling system components include:

• Coolant leaks
• Dried coolant residue around connections
• Cracked or hardened hoses
• Swollen hose sections
• Coolant smell around the vehicle
• Low coolant warnings
• Loss of cooling system pressure
• Increased risk of overheating

Replacing ageing hoses and connectors together helps restore the integrity of the cooling system.

When to Replace This Kit

• One or more radiator hoses are leaking
• Rubber hoses are cracked, swollen or hardened
• Hose connectors are damaged or worn
•  Cooling system is being overhauled
• Preventative cooling system maintenance is being carried out
• Multiple original hoses have reached a similar age

Where it fits on the car
Fits within the radiator coolant hose circuit, covering components shown under diagram references 9, 10 and 11.

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

RADHOSEKIT.997.OEM

The product you are viewing cross references to these numbers

OE Match radiator pipe replacement kit, intended for renewing corroded or leaking coolant pipework around the front wheels and across the front cooling circuit.

Fits

• Porsche 997 Gen 1
  997 MK1 Carrera 2 3.6L 2005-08
  997 MK1 Carrera 2S 3.8L 2005-08
  997 MK1 Carrera 4 3.6L 2005-08
  997 MK1 Carrera 4S 3.8L 2005-08
• Porsche 997 Gen 2
  997 MKII Carrera C2 3.6L 2009-12
  997 MKII Carrera C4 3.6L 2009-12
  997 MKII Carrera C2S 3.8L 2009-12
  997 MKII Carrera C4S 3.8L 2009-12
• Porsche 987 Boxster Gen 1
  Boxster 987 2.7L 2005-08/08
  Boxster 987 S 3.2/3.4L 2005-08/08
• Porsche 987 Boxster Gen 2
  Boxster 987 MKII 2.9L 2009-12
  Boxster S 987 MKII 3.4L 2009-12
• Porsche 987C Cayman Gen 1
  Cayman 2.7L 987C 2006-08
  Cayman S 3.4L 987C 2005-08
• Porsche 987C Cayman Gen 2
  Cayman 2.9L 987C MKII 2009-12
  Cayman S / R 3.4L 987C MKII 2009-12
  
  

Check fitment for your specific vehicle (model, year, engine) before ordering.


What This Product Does

The replacement pipework carries coolant through the radiator-section supply and return circuits. It addresses deteriorated connections and crossover pipes where corrosion or seepage has developed.

Functions

• Conveys coolant through the front cooling circuit.
• Connects supply and return pipework.
• Replaces affected pipes and hoses during cooling-system repairs.
  
  

Technical Details

• Supply cross tube reference: 99710671103; return cross tube reference: 99710672003.
• Connecting hose reference: 99710672307; diagram quantity: 2.
• Distributor tube references: 99710675104 and 99710675204. Supply and return descriptions vary between the supplied application diagrams.
• Left-side hose references: 99710662303 and 99710672803; right-side hose references: 99710662703 and 99710662403.
• Sleeve reference: 99710655103; diagram quantity: 2.
• Supplied 997.1 Carrera diagram identifies M96.05 3.6L and M97.01 3.8L Coupé/Cabriolet applications, 2005–08.
  
  

Symptoms of Fault

• Coolant collecting beneath the front of the vehicle.
• Damp connectors, staining or dried coolant deposits.
• A sweet odour accompanied by falling coolant levels.
• Low-coolant warnings, gurgling or increasing temperature readings.
  
  

Why Replacement Matters

Corrosion and ageing joints can allow coolant to escape. Renewing affected pipework addresses the leak source; adjoining hoses, seals, clips and supports should also be inspected rather than assuming the pipes alone explain every cooling fault.

FAQs

How can the leak source be confirmed?
A cooling-system pressure test can help distinguish leaking pipe joints from radiator or other cooling-component faults.

Does the kit provide every installation consumable?
Check the component contents against the planned repair. Do not assume coolant, additional seals, clips or mounting hardware are included.

Is gurgling proof of a failed pipe?
No. Low coolant or trapped air can produce similar sounds, so diagnosis is needed before replacing components.

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

WATERPIPEKIT05

The product you are viewing cross references to these numbers

Radiator pipes replacement kit. It's a common problem with 997 models that front coolant and cross over pipes behind the front wheels start weeping and become badly corroded, this kit replaces the ones you might need

Fits:
Porsche 997 Gen 1
Porsche 997 Gen 2

Porsche 987 Boxster Gen 1
Porsche 987 Boxster Gen 2

Porsche 987C Cayman Gen 1
Porsche 987C Cayman Gen 2
Manual & Tiptronic cars.

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

WATERPIPEKIT03

The product you are viewing cross references to these numbers

Radiators and pipes replacement kit.

This OE Match radiator and coolant pipe replacement kit is an all-in-one set of high-quality hoses and pipes engineered to replace the most common radiator and coolant delivery lines on Porsche 987 Boxster / Cayman and 997 Carrera models. Designed to match the factory routing and fitment, the kit includes radiator feed and return hoses, upper intake pipes, bypass lines, and related OE Match connectors required for a thorough cooling system service or overhaul.

Fits:
Porsche 997 Gen 1
Porsche 997 Gen 2

Porsche 987 Boxster Gen 1
Porsche 987 Boxster Gen 2

Porsche 987C Cayman Gen 1
Porsche 987C Cayman Gen 2
Manual & Tiptronic cars.

As engines age and operate under heat cycles and pressure, rubber hoses and coolant pipes can become soft, cracked, swollen, or restricted, leading to leaks, overheating, and reduced cooling performance. This comprehensive OE Match kit provides direct-fit replacements for the critical coolant lines between the radiator cores, coolant pump, thermostat housing, heater core, and engine block. Each component in the kit is manufactured to meet or exceed the original Porsche specification in hose inner diameter, bend geometry, wall thickness, and connection profile so that it installs cleanly into factory brackets and ports without modification. OE Match materials are chosen for long-term resistance to heat, coolant chemical exposure, and mechanical stress, ensuring durable performance throughout the life of the engine. This kit simplifies maintenance and repair by grouping all key radiator and coolant pipe replacements into one convenient solution, reducing parts hunting and ensuring that worn or deteriorated hoses do not compromise the cooling system’s integrity after other components (such as radiators or pumps) are serviced.

What This Kit Does:

The coolant and radiator pipes in this kit work together to:

• Carry coolant flow between the engine, thermostat, heater core, coolant pump, and radiator
• Maintain correct pressure and temperature balance across the cooling system
• Support reliable heat rejection through the radiator cores
• Prevent coolant loss and overheating due to brittle or collapsed hoses
• By matching OE geometry and fitment, these hoses help maintain efficient coolant circulation and stable operating temperatures during normal driving as well as spirited use.

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

RADANDPIPEKIT997.OEM

The product you are viewing cross references to these numbers

Radiators and pipes replacement kit.

This Genuine Porsche OE radiator and coolant pipe replacement kit is a comprehensive collection of factory-specified hoses, pipes, and coolant connections designed for Porsche 987 Boxster / Cayman and 997 Carrera models. Every component in the kit is a Genuine Porsche part, manufactured to original factory standards for fit, material quality, and long-term durability.

Fits:
Porsche 997 Gen 1
Porsche 997 Gen 2

Porsche 987 Boxster Gen 1
Porsche 987 Boxster Gen 2

Porsche 987C Cayman Gen 1
Porsche 987C Cayman Gen 2
Manual & Tiptronic cars.

This Genuine Porsche OE kit provides a complete solution for renewing the primary coolant and radiator pipework throughout the vehicle. It includes the key upper and lower radiator hoses, coolant feed and return pipes, and related connecting lines that form the core of the Porsche 987 and 997 cooling system.

Each component is engineered by Porsche to maintain exact factory routing, correct internal diameters, and precise sealing interfaces, ensuring optimal coolant flow and pressure balance. Genuine Porsche rubber compounds and pipe materials are designed to withstand extreme thermal cycling, coolant chemistry, and engine vibration over extended service life.

This kit is ideal when replacing radiators, performing water pump or thermostat service, or carrying out preventative maintenance on higher-mileage vehicles. Using all Genuine OE parts ensures the cooling system operates exactly as intended by Porsche engineers, without compromise in fitment, reliability, or performance.

What This Kit Does:

The coolant and radiator pipes in this kit work together to:

• Carry coolant flow between the engine, thermostat, heater core, coolant pump, and radiator
• Maintain correct pressure and temperature balance across the cooling system
• Support reliable heat rejection through the radiator cores
• Prevent coolant loss and overheating due to brittle or collapsed hoses
• By matching OE geometry and fitment, these hoses help maintain efficient coolant circulation and stable operating temperatures during normal driving as well as spirited use.

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

RADANDPIPEKIT997.OE

The product you are viewing cross references to these numbers