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Porsche > Boxster 718 (982) 2017>> > Boxster 718 2.0L Manual (300 Bhp) 2017>> > Engine Cooling > Coolant Hoses and Pipes >

Radiator Top / Bottom Hoses

Radiator Top / Bottom Hoses

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Breather Line, Cooler For Coolant. Porsche 982 / 982C / 991.2 2017>> - 9P1121465, 9P1121466
3
Breather Line, Cooler For Coolant. Porsche 982 / 982C / 991.2 2017>>
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9P11214
Product Information
Product Information
Breather Line, Cooler For Coolant.
Ensure proper cooling system ventilation and pressure control with the Breather Line, Cooler for Coolant. This breather line is designed to route air and vapor from the coolant cooler system, helping maintain stable pressure and efficient coolant circulation under varying engine temperatures.  

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 Boxster Spyder / Sypder RS 718 4.0L 01/2019>>
  • Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp) 01/2020>>
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
  • Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 2S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Targa 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Speedster 4.0L (510Bhp) 2019
  • Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
  • Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
  • 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)
  • Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L  

Diagram Ref No 20

What This Product Does:

  • Vents air and vapor from the coolant cooler system
  • Helps regulate cooling system pressure
  • Supports consistent coolant circulation
  • Reduces strain on hoses, seals, and cooling components

Symptoms Of Wear Or Failure:
  • Coolant leaks near the coolant cooler or hose connections
  • Sweet coolant smell from the engine bay
  • Coolant residue or staining around fittings and clamps
  • Cracked, brittle, or collapsed hose material
  • Loose or leaking hose connections
  • Gradual coolant loss requiring frequent top-offs
  • Pressure buildup in the cooling system (may cause swelling hoses)
  • Steam from under the hood in more severe cases
  • Engine temperature running higher than normal if coolant flow is affected

Why Replacement Matters:
  • Replacing a worn or damaged coolant cooler breather line is important because it helps the cooling system properly vent air and regulate pressure during normal engine operation. Over time, heat and constant exposure to coolant can cause the line to become brittle, cracked, or leak.
  • If the breather line fails, it can lead to coolant loss, pressure buildup, and added strain on surrounding hoses and seals. This may reduce cooling system efficiency and increase the risk of overheating or costly component damage.
  • Installing a new breather line helps prevent leaks, supports stable cooling performance, and protects the engine by maintaining proper system pressure and ventilation.



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

9P11214
9P1121465
9P1121466

The product you are viewing cross references to these numbers
Breather Line, Cooler For Coolant. Porsche 982 / 982C / 991.2 2017>> - 9P1121465, 9P1121466
3
Breather Line, Cooler For Coolant. Porsche 982 / 982C / 991.2 2017>>
9P11214
Product Information
Product Information
Breather Line, Cooler For Coolant.
Ensure proper cooling system ventilation and pressure control with the OE MATCH Breather Line, Cooler for Coolant. This breather line is designed to route air and vapor from the coolant cooler system, helping maintain stable pressure and efficient coolant circulation under varying engine temperatures.  

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 Boxster Spyder / Sypder RS 718 4.0L 01/2019>>
  • Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp) 01/2020>>
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
  • Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 2S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Targa 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Speedster 4.0L (510Bhp) 2019
  • Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
  • Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
  • 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)
  • Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L  

Diagram Ref No 20

What This Product Does:

  • Vents air and vapor from the coolant cooler system
  • Helps regulate cooling system pressure
  • Supports consistent coolant circulation
  • Reduces strain on hoses, seals, and cooling components

Symptoms Of Wear Or Failure:
  • Coolant leaks near the coolant cooler or hose connections
  • Sweet coolant smell from the engine bay
  • Coolant residue or staining around fittings and clamps
  • Cracked, brittle, or collapsed hose material
  • Loose or leaking hose connections
  • Gradual coolant loss requiring frequent top-offs
  • Pressure buildup in the cooling system (may cause swelling hoses)
  • Steam from under the hood in more severe cases
  • Engine temperature running higher than normal if coolant flow is affected

Why Replacement Matters:
  • Replacing a worn or damaged coolant cooler breather line is important because it helps the cooling system properly vent air and regulate pressure during normal engine operation. Over time, heat and constant exposure to coolant can cause the line to become brittle, cracked, or leak.
  • If the breather line fails, it can lead to coolant loss, pressure buildup, and added strain on surrounding hoses and seals. This may reduce cooling system efficiency and increase the risk of overheating or costly component damage.
  • Installing a new breather line helps prevent leaks, supports stable cooling performance, and protects the engine by maintaining proper system pressure and ventilation.



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

9P11214
9P1121465
9P1121466

The product you are viewing cross references to these numbers
DISPLAYING 1 to 2 (of 2 products)
Also found on these pages
About Radiator Top / Bottom Hoses

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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