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Porsche > Boxster 718 (982) 2017>> > Engine Cooling > Coolant Hoses and Pipes (Rear engine cars) >

Coolant Hoses - Radiator Section

Coolant Hoses - Radiator Section

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Water coolant radiator hose top right, feed. Porsche 982 Boxster / 982 Cayman / 991.2 - 9P1121612
2
Water coolant radiator hose top right, feed. Porsche 982 Boxster / 982 Cayman / 991.2
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9P1121612
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Product Information
Water coolant radiator hose top right, feed.

Fits:
Porsche 982 (718) Boxster 2017>>
Porsche 982SP (718) Boxster Spyder 2019>>
Porsche 982C (718) Cayman 2017>>
Porsche GT4.2 Cayman 2019>>

Porsche 991.2 Carrera 2017 - 2021
Porsche 991.2 GT3 4.0L 
Porsche 991.2 GT2 RS 

Diagram ref no 19

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9P1121612
9P1121612

The product you are viewing cross references to these numbers
Water coolant radiator hose top right, feed. Porsche 982 Boxster / 982 Cayman / 991.2 - 9P1121612 - 86860
2
Water coolant radiator hose top right, feed. Porsche 982 Boxster / 982 Cayman / 991.2
9P1121612/1
Product Information
Product Information
Water coolant radiator hose top right, feed.

Fits:
Porsche 982 (718) Boxster 2017>>
Porsche 982SP (718) Boxster Spyder 2019>>
Porsche 982C (718) Cayman 2017>>
Porsche GT4.2 Cayman 2019>>

Porsche 991.2 Carrera 2017 - 2021
Porsche 991.2 GT3 4.0L 
Porsche 991.2 GT2 RS 

Diagram ref no 19

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9P1121612
9P1121612

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Water Coolant Top Hose LEFT Centre Radiator. Porsche 718 Boxster / 718 Cayman - 9P1121629A
4
Water Coolant Top Hose LEFT Centre Radiator. Porsche 718 Boxster / 718 Cayman
Special Order item
9P1121629A
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Product Information

Left Hand Coolant Hose for Centre Radiator

The left hand coolant hose is an essential cooling system component used on the Porsche 718 Boxster and 718 Cayman. This hose connects to the centre radiator and allows coolant to circulate between the radiator and the engine cooling system.

Fits:

  • Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 4.0L Manual (400 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
  • Porsche Cayman 718 2.0L Manual (300 Bhp)
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L Manual (350 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Cayman T 718 2.0L Manual (300 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)

Diagram Ref No 6

Modern Porsche engines rely on efficient coolant circulation to maintain safe operating temperatures, especially during spirited driving or extended high-load conditions. A properly functioning coolant hose ensures consistent coolant flow and helps protect the engine from overheating.

What This Coolant Hose Does

The cooling system on the Porsche 718 uses multiple radiators positioned at the front of the vehicle to dissipate heat from the engine coolant. The centre radiator improves cooling efficiency under higher loads.

The left hand coolant hose helps:

• Carry coolant between the centre radiator and the main cooling circuit
• Maintain stable engine operating temperatures
• Ensure efficient heat dissipation through the radiator system
• Support reliable cooling during fast road or track driving

Without proper coolant flow, engine temperatures can rise quickly, increasing the risk of overheating and engine damage.

Why Coolant Hoses Fail

Coolant hoses operate under constant pressure and high temperature conditions. Over time, materials degrade and may begin to fail.

Common causes of hose failure include:

Heat ageing
 Continuous heating and cooling cycles can cause rubber hoses to harden or crack.

Pressure fatigue
 The cooling system operates under pressure, which can weaken older hoses and cause swelling or splits.

Coolant contamination
 Old coolant or contaminants may degrade hose materials internally.

Mechanical wear
 Movement, vibration or contact with nearby components can damage the hose over time.

Symptoms of a Failing Coolant Hose

• Visible coolant leaks under the vehicle
• Sweet coolant smell from the front of the car
• Low coolant warning messages
• Engine temperature rising unexpectedly
• Visible cracking, swelling or soft spots on the hose

Replacing worn hoses prevents sudden coolant loss and protects the engine from overheating.

Why You May Need to Replace This Hose

Prevent Cooling System Leaks
 Replacing ageing hoses ensures the cooling system remains properly sealed and pressurised.

Maintain Engine Cooling Performance
 Reliable coolant flow is essential for maintaining correct operating temperatures in high performance engines.

Protect Engine Components
 Coolant loss can lead to overheating, which may cause severe engine damage if left unresolved.




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

9P1121629A
9P1121629A

The product you are viewing cross references to these numbers
Water Coolant Top Hose RIGHT Centre Radiator. Porsche 718 Boxster / 718 Cayman - 9P1121630A
4
Water Coolant Top Hose RIGHT Centre Radiator. Porsche 718 Boxster / 718 Cayman
Special Order item
9P1121630A
Product Information
Product Information

Right Hand Coolant Hose for Centre Radiator

The right hand coolant hose is an essential cooling system component used on the Porsche 718 Boxster and 718 Cayman. This hose connects to the centre radiator and allows coolant to circulate between the radiator and the engine cooling system.

Fits:

  • Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 4.0L Manual (400 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
  • Porsche Cayman 718 2.0L Manual (300 Bhp)
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L Manual (350 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Cayman T 718 2.0L Manual (300 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)

Diagram Ref No 7

Modern Porsche engines rely on efficient coolant circulation to maintain safe operating temperatures, especially during spirited driving or extended high-load conditions. A properly functioning coolant hose ensures consistent coolant flow and helps protect the engine from overheating.

What This Coolant Hose Does

The cooling system on the Porsche 718 uses multiple radiators positioned at the front of the vehicle to dissipate heat from the engine coolant. The centre radiator improves cooling efficiency under higher loads.

The left hand coolant hose helps:

• Carry coolant between the centre radiator and the main cooling circuit
• Maintain stable engine operating temperatures
• Ensure efficient heat dissipation through the radiator system
• Support reliable cooling during fast road or track driving

Without proper coolant flow, engine temperatures can rise quickly, increasing the risk of overheating and engine damage.

Why Coolant Hoses Fail

Coolant hoses operate under constant pressure and high temperature conditions. Over time, materials degrade and may begin to fail.

Common causes of hose failure include:

Heat ageing
 Continuous heating and cooling cycles can cause rubber hoses to harden or crack.

Pressure fatigue
 The cooling system operates under pressure, which can weaken older hoses and cause swelling or splits.

Coolant contamination
 Old coolant or contaminants may degrade hose materials internally.

Mechanical wear
 Movement, vibration or contact with nearby components can damage the hose over time.

Symptoms of a Failing Coolant Hose

• Visible coolant leaks under the vehicle
• Sweet coolant smell from the front of the car
• Low coolant warning messages
• Engine temperature rising unexpectedly
• Visible cracking, swelling or soft spots on the hose

Replacing worn hoses prevents sudden coolant loss and protects the engine from overheating.

Why You May Need to Replace This Hose

Prevent Cooling System Leaks
 Replacing ageing hoses ensures the cooling system remains properly sealed and pressurised.

Maintain Engine Cooling Performance
 Reliable coolant flow is essential for maintaining correct operating temperatures in high performance engines.

Protect Engine Components
 Coolant loss can lead to overheating, which may cause severe engine damage if left unresolved.




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

9P1121630A
9P1121630A

The product you are viewing cross references to these numbers
DISPLAYING 17 to 20 (of 20 products)
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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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