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Porsche > Boxster 718 (982) 2017>> > Boxster S 718 2.5L PDK (350 Bhp) 05/2017>> > Engine Cooling > Coolant Hoses and Pipes (Rear engine cars) >

Coolant Hoses - Engine Bay

Coolant Hoses - Engine Bay

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DISPLAYING 1 to 4 (of 11 products)
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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.

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Related, superseded, cross reference or alternative numbers for comparison.

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.

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Related, superseded, cross reference or alternative numbers for comparison.

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Related, superseded, cross reference or alternative numbers for comparison.

982121637A
982121637A

The product you are viewing cross references to these numbers
DISPLAYING 1 to 4 (of 11 products)
1 2 3
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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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