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

Coolant Hoses - Engine Bay

Coolant Hoses - Engine Bay

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DISPLAYING 1 to 10 (of 10 products)
Breather Hose - Coolant Reservoir Filler Neck. Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>> - 982121533F
3
Breather Hose - Coolant Reservoir Filler Neck. Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>>
Special Order item
982121533F
Product Information
Product Information
Breather hose for the coolant reservoir filler neck. 

Fits:
Porsche 718 (982) Boxster 2.0L 2017>> 
Porsche 718 (982) Boxster S 2.5L 2017>>
Porsche 718 (982) Boxster GTS 2.5L 2017>>

Porsche 718 (982) Cayman 2.0L 2017>>
Porsche 718 (982) Cayman S 2.5L 2017>>
Porsche 718 (982) Cayman GTS 2.5L 2017>> 

NOTE: This hose is not compatible with GTS 4.0L models. 

Diagram ref. 11.

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982121533F
982121533F

The product you are viewing cross references to these numbers
Breather Hose - Coolant Reservoir Filler Neck. Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>> - 982121533F
2
Breather Hose - Coolant Reservoir Filler Neck. Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>>
982121533F/1
Product Information
Product Information
Breather Hose - Coolant Reservoir Filler Neck.

Maintain proper cooling system ventilation and reservoir performance with the Breather Hose – Coolant Reservoir Filler Neck. This OE MATCH breather hose connects to the coolant reservoir filler neck, allowing excess air and vapor to vent correctly as coolant expands and contracts during normal engine operation.

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 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) 

Diagram Ref No 11

What This Product Does:
  • Vents trapped air from the coolant reservoir area
  • Helps regulate cooling system pressure as coolant expands and contracts
  • Prevents pressure buildup that can cause leaks or hose damage
  • Supports proper coolant reservoir and cooling system performance

Symptoms Of Wear Or Failure:
  • Coolant leaks near the reservoir filler neck
  • Sweet coolant smell from the engine bay
  • Coolant residue or staining around hose connections
  • Cracked, brittle, or hardened hose material
  • Collapsed or kinked hose restricting proper venting
  • Pressure buildup in the cooling system
  • Swollen hoses due to improper ventilation
  • Low coolant warning light if leaks develop

Why Replacement Matters:
  • Replacing a worn breather hose is important because it helps the coolant reservoir vent properly and maintain correct cooling system pressure. Over time, heat and coolant exposure can cause the hose to become brittle, cracked, or restricted.
  • If the hose fails, it may lead to coolant leaks, pressure buildup, and added strain on surrounding hoses, seals, and the reservoir itself. Poor ventilation can also reduce cooling system efficiency and increase the risk of overheating.
  • Installing a new breather hose helps restore proper venting, prevent leaks, and protect the engine by keeping the cooling system operating reliably.



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

982121533F
982121533F

The product you are viewing cross references to these numbers
Coolant Hose - Expansion Tank to Bleeder Valve - for Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>> - 982121637A
2
Coolant Hose - Expansion Tank to Bleeder Valve - for Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>>
Special Order item
982121637A
Product Information
Product Information
Coolant hose - runs from the expansion tank to the bleeder valve. 

Fits:
Porsche 718 (982) Boxster 2.0L 2017>>
Porsche 718 (982) Boxster S 2.5L 2017>> 
Porsche 718 (982) Boxster GTS 2.5L 2017>> 

Porsche 718 (982) Cayman 2.0L 2017>> 
Porsche 718 (982) Cayman S 2.5L 2017>> 
Porsche 718 (982) Cayman GTS 2.5L 2017>> 

Diagram ref. 5.

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982121637A
982121637A

The product you are viewing cross references to these numbers
Coolant Hose - Expansion Tank To Bleeder Valve. Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>> - 982121637A
2
Coolant Hose - Expansion Tank To Bleeder Valve. Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>>
982121637A/1
Product Information
Product Information
Coolant Hose - Expansion Tank To Bleeder Valve.
Ensure proper cooling system ventilation and coolant circulation with the Coolant Hose – Expansion Tank to Bleeder Valve. This OE MATCH hose connects the expansion tank to the bleeder valve, allowing trapped air to escape and helping maintain correct system pressure during engine operation.

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 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)

Diagram Ref No 5

What This Product Does:

  • Allows trapped air to escape during coolant circulation
  • Helps prevent air pockets in the cooling system
  • Supports stable coolant pressure regulation
  • Maintains consistent engine operating temperature
  • Promotes efficient coolant flow throughout the system

Symptoms Of Wear Or Failure:
  • Coolant leaks near the expansion tank or bleeder valve connection
  • Low coolant warning light or frequent coolant top-offs
  • Sweet coolant smell from the engine bay
  • Coolant residue or staining around hose fittings
  • Cracks, splits, or brittle hose material
  • Air trapped in the cooling system, causing gurgling sounds
  • Fluctuating engine temperature or inconsistent temperature gauge readings
  • Overheating, especially after coolant service or refilling
  • Steam from under the hood in severe cases

Why Replacement Matters:
  • This hose plays a key role in allowing the cooling system to properly vent air and maintain stable pressure. If it becomes cracked, brittle, or blocked, air can remain trapped in the system, leading to inconsistent coolant circulation and temperature fluctuations.
  • Failure to replace a worn hose may result in coolant leaks, pressure imbalance, overheating, and reduced cooling efficiency. Air pockets in the system can also place additional strain on other cooling components.
  • Replacing the hose helps ensure proper system bleeding, prevents leaks, and protects the engine by maintaining reliable temperature control and cooling system performance.



Related reference numbers
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982121637A
982121637A

The product you are viewing cross references to these numbers
Coolant Pump Outlet Pipe - Metal - for Porsche 718 (982) Boxster / Cayman 2017>> - 9A210602530, 9A210602531, 9A210602532
3
Coolant Pump Outlet Pipe - Metal - for Porsche 718 (982) Boxster / Cayman 2017>>
Special Order item
9A210602532
Product Information
Product Information
Coolant pump outlet pipe - metal. 

Fits:
Porsche 718 (982) Boxster 2.0L 2017>>
Porsche 718 (982) Boxster S 2.5L 2017>>
Porsche 718 (982) Cayman 2.0L 2017>>
Porsche 718 (982) Cayman S 2.5L 2017>>

Diagram ref. 10. 

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9A210602532
9A210602530
9A210602531
9A210602532

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O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991 - 99610680103
9
O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991
Special Order item
99610680103
Product Information
Product Information
O-ring – 46.7 x 3.53 – used in various applications within the car's cooling system.

Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12

Porsche 981 Boxster 2012-16 
Porsche 981 Boxster Spyder 2016 
Porsche 981 Cayman 2014-16 
Porsche 981 Cayman GT4 2016 

Porsche 718 (982) Boxster 2017>> 
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
Porsche 718 (982) Cayman GT4 2019>>

Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05

Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11

Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21

Related reference numbers
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99610680103
99610680103

The product you are viewing cross references to these numbers
O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991 - 99610680103 - ORS161125
9
O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991
99610680103/1
Product Information
Product Information
O-ring – 46.7 x 3.53 – used in various applications within the car's cooling system.

Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12

Porsche 981 Boxster 2012-16 
Porsche 981 Boxster Spyder 2016 
Porsche 981 Cayman 2014-16 
Porsche 981 Cayman GT4 2016 

Porsche 718 (982) Boxster 2017>> 
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
Porsche 718 (982) Cayman GT4 2019>>

Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05

Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11

Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21

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99610680103
99610680103

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Regulating valve water cooling. Porsche 981 / 718 / 997.2 / 991 - 9P1317233
4
Regulating valve water cooling. Porsche 981 / 718 / 997.2 / 991
Special Order item
9P1317233
Product Information
Product Information
Regulating valve water cooling. 

porsche

Fits:
Porsche 981 Boxster - 2012 to 2016
Porsche 981 Cayman - 2013 to 2016
Porsche 718 Boxster - 2017 Onwards
Porsche 718 Cayman - 2017 Onwards
Porsche 997.2 - 2009 to 2012
Porsche 991 - 2012 to 2019

Click 'Zoom in' for large parts diagram.
Diagram ref no 4


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9P1317233
9P1317233

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Reservoir Coolant Hose for Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>> - 982121625B
2
Reservoir Coolant Hose for Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>>
Special Order item
982121625B
Product Information
Product Information
Coolant hose - connects to the underside of the reservoir or expansion tank. 

Fits:
Porsche 718 (982) Boxster 2.0L 2017>> 
Porsche 718 (982) Boxster S 2.5L 2017>> 
Porsche 718 (982) Boxster GTS 2.5L 2018>> 

Porsche 718 (982) Cayman 2.0L 2017>> 
Porsche 718 (982) Cayman S 2.5L 2017>> 
Porsche 718 (982) Cayman GTS 2.5L 2018>> 

Diagram ref. 6. 

NOTE: This coolant hose is not suitable for 4.0L GTS models. 

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

982121625B
982121625B

The product you are viewing cross references to these numbers
Reservoir Coolant Hose. Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>> - 982121625B
2
Reservoir Coolant Hose. Porsche 718 (982) Boxster & Cayman 2.0L / 2.5L 2017>>
982121625B/1
Product Information
Product Information
Reservoir Coolant Hose.

Maintain reliable cooling system performance with the Reservoir Coolant Hose. This OE MATCH hose is designed to transfer coolant between the coolant reservoir (expansion tank) and the engine cooling system, helping ensure proper coolant circulation and stable system pressure.

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 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)  

Diagram Ref No 6

What This Product Does:
  • Moves coolant to and from the coolant reservoir
  • Helps maintain proper coolant level and circulation
  • Supports cooling system pressure balance during temperature changes
  • Prevents overheating by ensuring consistent coolant flow

Symptoms Of Wear Or Failure:
  • Coolant leaks near the reservoir or along the hose line
  • Low coolant warning light
  • Frequent coolant top-offs
  • Sweet coolant smell from the engine bay
  • Coolant residue or staining around hose connections
  • Cracks, splits, or swelling in the hose material
  • Soft, spongy, or brittle rubber texture
  • Pressure-related seepage around clamps or fittings
  • Engine running hotter than normal if coolant loss becomes severe

Why Replacement Matters:
  • Replacing a worn reservoir coolant hose is important because it helps maintain proper coolant circulation and supports stable cooling system pressure. Over time, heat and constant exposure to coolant can cause the hose to crack, weaken, or leak.
  • If the hose fails, it may lead to coolant loss, poor pressure regulation, and overheating. Even small leaks can gradually reduce coolant levels and put the engine at risk of serious damage.
  • Installing a new hose helps prevent leaks, restores reliable coolant flow, and protects the engine by keeping the cooling system operating efficiently.



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

982121625B
982121625B

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DISPLAYING 1 to 10 (of 10 products)
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About Coolant Hoses - Engine Bay

Coolant Hoses – Engine Bay | Reliable Cooling for Peak Porsche Performance

Coolant hoses in the engine bay are critical components that circulate coolant between the radiator, water pump, and engine block — maintaining consistent operating temperatures and preventing overheating. These hoses carry coolant through high-pressure, high-temperature zones within the engine bay, ensuring your Porsche performs at its best, even under demanding conditions.

At Design911, we stock a wide range of genuine and manufacturer-quality engine bay coolant hoses for Porsche models including 911, Boxster, Cayman. Each hose is designed to fit perfectly, resist extreme temperatures, and deliver long-lasting performance — matching the quality, precision and reliability.

What Do Engine Bay Coolant Hoses Do?

Coolant hoses form part of your Porsche’s closed-loop cooling system. Their job is to:

  • Circulate coolant between the engine, radiator, and water pump.
  • Maintain engine temperature for optimal performance and emissions.
  • Support consistent coolant pressure during operation.
  • Prevent engine overheating and protect internal components from heat damage.

In high-performance engines, such as those found in Porsche vehicles, properly functioning hoses are essential for ensuring precise temperature control and long-term mechanical integrity.

Why Do Engine Bay Coolant Hoses Fail?

Over time, coolant hoses endure constant exposure to heat, vibration, and pressure, which can cause wear and eventual failure. Common causes include:

  • Rubber deterioration from heat cycling and coolant chemicals.
  • Cracking or hardening due to age and environmental factors.
  • Swelling or soft spots from internal coolant corrosion.
  • Leaks at connections caused by weakened hose ends or clamps.
  • Abrasion or rubbing against other engine components.

Symptoms of failure include coolant leaks, overheating, fluctuating temperature readings, or a noticeable smell of coolant in the engine bay.

Why Replace Faulty Coolant Hoses?

A damaged or leaking hose can cause rapid coolant loss and severe engine overheating. Replacing worn hoses ensures your Porsche’s cooling system functions reliably and efficiently.

Benefits of replacement include:

  • Restored coolant circulation and temperature control.
  • Prevention of leaks, overheating, and potential engine damage.
  • Improved reliability and performance under all driving conditions.
  • Manufacturer-quality construction and perfect fitment.

All hoses in this range are built using reinforced, high-grade rubber compounds designed to withstand extreme heat, pressure, and vibration — ensuring lasting durability and peace of mind.

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