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Porsche > Boxster 718 (982) 2017>> > Boxster T 718 2.0L PDK (300 Bhp) 01/2019>> > Engine Cooling >

Coolant Bottles / Expansion Tanks

Coolant Bottles / Expansion Tanks

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DISPLAYING 1 to 10 (of 10 products)
Bleed Valve for Engine Coolant Reservoir for Porsche 970 Panamera Diesel / 718 (982) Boxster & Cayman - 97010644730, 298121671
3
Bleed Valve for Engine Coolant Reservoir for Porsche 970 Panamera Diesel / 718 (982) Boxster & Cayman
Special Order item
298121671
Product Information
Product Information
Bleed valve for the engine coolant reservoir. 

Fits:
Porsche 970 Panamera Diesel 3.0L 2012-16

Porsche 718 (982) Boxster 2.0L 2017>> 
Porsche 718 (982) Boxster S 2.5L 2017>> 
Porsche 718 (982) Boxster Spyder / RS 4.0L 2019>>
Porsche 718 (982) Boxster GTS 4.0L 2020>> 

Porsche 718 (982) Cayman 2.0L 2017>> 
Porsche 718 (982) Cayman S 2.5L 2017>> 
Porsche 718 (982) Cayman GT4 / RS 4.0L 2019>> 
Porsche 718 (982) Cayman GTS 4.0L 2020>> 

Diagram ref. 9. 

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298121671
97010644730
298121671

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Related, superseded, cross reference or alternative numbers for comparison.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

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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
Engine coolant filler neck lid. Porsche 981 / 982 Boxster / Cayman - 98110604406, 98110604405, 98110604404, 98110604403
3
Engine coolant filler neck lid. Porsche 981 / 982 Boxster / Cayman
Special Order item
98110604406
Product Information
Product Information
Engine coolant filler neck lid.

porsche

Fits:
Porsche 981 Boxster 2012-16
Porsche 981SP Boxster Spyder 2016
Porsche 981C Cayman 2014-16
Porsche 981 Cayman GT4 2016

Porsche 982 Boxster 2017-24
Porsche 982C Cayman 2017-24
Porsche 982 Spyder 2019-24
Porsche 982 Cayman GT4 2019-24

Click 'Zoom in' for large parts diagram.
Diagram ref no 2

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Related, superseded, cross reference or alternative numbers for comparison.

98110604406
98110604406
98110604405
98110604404
98110604403

The product you are viewing cross references to these numbers
Gasket for coolant reservoir cap. Porsche 982 Boxster / 982C Cayman - 982121687
2
Gasket for coolant reservoir cap. Porsche 982 Boxster / 982C Cayman
Special Order item
982121687
Product Information
Product Information
Gasket for coolant reservoir cap.

porsche

Fits:
Porsche 982 Boxster 2017>>
Porsche 982C Cayman 2017>>

Diagram ref no 3

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982121687
982121687

The product you are viewing cross references to these numbers
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

The product you are viewing cross references to these numbers
Water tank filler neck. Porsche 981/982 Boxster/Cayman - 98110615005
7
Water tank filler neck. Porsche 981/982 Boxster/Cayman
Special Order item
98110615005
Product Information
Product Information
Water tank filler neck.

porsche

Fits:
Porsche 981 Boxster 2012-16
Porsche 981SP Boxster Spyder 2016
Porsche 982 Boxster 2017>>
Porsche 982SP Boxster Spyder 2019>>
Porsche 981C Cayman 2014-16
Porsche 981C Cayman GT4 2016
Porsche 982C Cayman 2017>>
Porsche 982C Cayman GT4 2019>>

Click 'Zoom in' for large parts diagram.
Diagram ref no 7

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98110615005
98110615005

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DISPLAYING 1 to 10 (of 10 products)
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About Coolant Bottles / Expansion Tanks

Coolant Bottles / Expansion Tanks – Reliable Cooling Performance for Porsche Vehicles

Coolant bottles (also known as expansion tanks) are a vital part of your Porsche’s cooling system. They store excess coolant and manage pressure fluctuations as the engine heats up and cools down. By maintaining proper coolant levels and system pressure, they help prevent overheating, engine damage, and coolant loss - ensuring optimal performance and reliability.

At Design911, we offer a complete range of genuine and quality coolant bottles and expansion tanks for Porsche models including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each tank is designed to deliver exact fitment, superior material strength, and long-term resistance to heat and pressure - matching the quality and precision of factory components.

What Do Coolant Bottles / Expansion Tanks Do?

The coolant bottle or expansion tank works as part of a sealed cooling system to:

  • Store and regulate excess coolant as temperatures and pressure fluctuate.
  • Maintain consistent pressure to prevent overheating or boiling.
  • Allow coolant recovery as the system cools, keeping the radiator full.
  • Provide a visible level indicator to monitor coolant condition and volume.

A properly functioning expansion tank ensures your engine operates at a stable temperature, improving efficiency and extending engine life.

Why Do Coolant Bottles Fail?

Coolant bottles are constantly exposed to heat, vibration, and pressure, which can cause degradation over time. Common causes of failure include:

  • Plastic fatigue or cracking from thermal cycling.
  • Coolant leaks around seams, caps, or hose connections.
  • Discolouration or brittleness from age and coolant exposure.
  • Faulty pressure caps leading to loss of system pressure.
  • Corrosion or contamination inside the tank.

Symptoms of a failing coolant bottle include visible coolant leaks, low coolant warnings, overheating, or pressure loss within the cooling system.

Why Replace Faulty Coolant Bottles / Expansion Tanks?

A damaged or leaking expansion tank can quickly lead to overheating, engine damage, or complete cooling system failure. Replacing it ensures safe, efficient operation and protects vital engine components.

Benefits of replacement include:

  • Restored coolant capacity and pressure stability.
  • Prevention of leaks and overheating.
  • Enhanced cooling system reliability and engine protection.
  • Factory-spec construction with manufacturer-level durability.

All replacement tanks are designed to meet or exceed factory standards using high-grade materials that resist cracking, corrosion, and deformation under extreme conditions

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