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Coolant Bottles / Expansion Tanks

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DISPLAYING 1 to 10 (of 10 products)
Special Order item
95B121447E
Product Information
Product Information
Breather Line For Water Tank.

The Porsche Breather Line for Water Tank is a genuine Porsche cooling system component designed to vent excess air and pressure from the coolant expansion tank while maintaining the correct operating conditions within the cooling system. Manufactured to Porsche's exact specifications for fit, flexibility and durability, this breather line helps ensure efficient coolant circulation and stable cooling system performance.

Fits:

  • Porsche 95B.1 Macan S Petrol 3.0L V6 (340Bhp) 2014-18
  • Porsche 95B.1 Macan GTS Petrol 3.0L V6 (360Bhp) 2014-18
  • Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18  

Diagram Ref No 22

Constructed from high-quality, heat-resistant reinforced hose, the breather line is engineered to withstand continuous exposure to coolant vapour, engine heat, pressure fluctuations and vibration. Precision-moulded for factory-correct routing, it provides secure, leak-free connections and supports the proper operation of the coolant expansion tank and engine cooling system.  

What This Product Does:

  • Vents air and coolant vapour from the coolant expansion tank.
  • Helps regulate pressure within the cooling system.
  • Maintains efficient coolant circulation.
  • Supports proper filling and bleeding of the cooling system.
  • Prevents air locks within the cooling circuit.
  • Provides a secure, leak-free connection.
  • Helps maintain stable engine operating temperatures.
  • Forms an essential part of the engine cooling system.

Symptoms Of Wear Or Failure:
  • Coolant leaks around the expansion tank.
  • Visible cracks or splits in the hose.
  • Coolant smell from the engine bay.
  • Air entering the cooling system.
  • Frequent coolant loss.
  • Engine overheating.
  • Coolant warning light or repeated low coolant warnings.
  • White or coloured coolant residue around hose connections.
  • Swollen, brittle or hardened hose material.
  • Difficulty bleeding the cooling system after servicing.

Why Replacement Matters:
  • The breather line is continually exposed to heat, coolant vapour, pressure changes and engine vibration. Over time, the hose material can harden, crack or lose flexibility, while connections may weaken, leading to coolant leaks or allowing air to enter the cooling system.
  • A leaking or blocked breather line can disrupt pressure regulation within the coolant expansion tank, increasing the risk of air locks, coolant loss and engine overheating. Continued operation with a compromised cooling system can lead to reduced engine efficiency and potentially serious engine damage.
  • Replacing a worn or damaged breather line restores the integrity of the cooling system and ensures the coolant expansion tank operates as designed. A genuine Porsche replacement provides factory-correct fitment, premium-quality materials and long-lasting reliability, helping maintain optimum engine temperatures, cooling efficiency and the dependable performance expected from your Porsche.



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

95B121447E
95B121447
95B121447E

The product you are viewing cross references to these numbers
95B121447E/1
Product Information
Product Information
Breather Line For Water Tank.

The OE MATCH Breather Line for Water Tank is a cooling system component designed to vent excess air and pressure from the coolant expansion tank while maintaining the correct operating conditions within the cooling system. This breather line helps ensure efficient coolant circulation and stable cooling system performance.

Fits:

  • Porsche 95B.1 Macan S Petrol 3.0L V6 (340Bhp) 2014-18
  • Porsche 95B.1 Macan GTS Petrol 3.0L V6 (360Bhp) 2014-18
  • Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18  

Diagram Ref No 22

Constructed from high-quality, heat-resistant reinforced hose, the breather line is engineered to withstand continuous exposure to coolant vapour, engine heat, pressure fluctuations and vibration. Precision-moulded for factory-correct routing, it provides secure, leak-free connections and supports the proper operation of the coolant expansion tank and engine cooling system.  

What This Product Does:

  • Vents air and coolant vapour from the coolant expansion tank.
  • Helps regulate pressure within the cooling system.
  • Maintains efficient coolant circulation.
  • Supports proper filling and bleeding of the cooling system.
  • Prevents air locks within the cooling circuit.
  • Provides a secure, leak-free connection.
  • Helps maintain stable engine operating temperatures.
  • Forms an essential part of the engine cooling system.

Symptoms Of Wear Or Failure:
  • Coolant leaks around the expansion tank.
  • Visible cracks or splits in the hose.
  • Coolant smell from the engine bay.
  • Air entering the cooling system.
  • Frequent coolant loss.
  • Engine overheating.
  • Coolant warning light or repeated low coolant warnings.
  • White or coloured coolant residue around hose connections.
  • Swollen, brittle or hardened hose material.
  • Difficulty bleeding the cooling system after servicing.

Why Replacement Matters:
  • The breather line is continually exposed to heat, coolant vapour, pressure changes and engine vibration. Over time, the hose material can harden, crack or lose flexibility, while connections may weaken, leading to coolant leaks or allowing air to enter the cooling system.
  • A leaking or blocked breather line can disrupt pressure regulation within the coolant expansion tank, increasing the risk of air locks, coolant loss and engine overheating. Continued operation with a compromised cooling system can lead to reduced engine efficiency and potentially serious engine damage.
  • Replacing a worn or damaged breather line restores the integrity of the cooling system and ensures the coolant expansion tank operates as designed.



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

95B121447E
95B121447
95B121447E

The product you are viewing cross references to these numbers
Special Order item
00004330515
Product Information
Product Information
Coolant / Antifreeze 1Ltr Top-up Bottle - Long Life 5 Year Red

Anti Freeze, please check your vehicle handbook for applications

Mix 50/50 with distilled water for best results.



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

00004330515
00004330103
00004330112
00004330113
00004330147
00004330148
00004330515
00004330516

The product you are viewing cross references to these numbers
Special Order item
95B122447E
Product Information
Product Information
Coolant expansion tank breather line.

Fits:
Porsche 95B.1 Macan S 3.0ltr - 2014 to 2018
Porsche 95B.1 Macan GTS 3.0ltr - 2014 to 2018
Porsche 95B.1 Macan turbo 3.0ltr - 2014 to 2018

Diagram ref no 8

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

95B122447E
95B122447E
95B122447

The product you are viewing cross references to these numbers
95B122447E/1
Product Information
Product Information
Coolant expansion tank breather line.

Fits:
Porsche 95B.1 Macan S 3.0ltr - 2014 to 2018
Porsche 95B.1 Macan GTS 3.0ltr - 2014 to 2018
Porsche 95B.1 Macan turbo 3.0ltr - 2014 to 2018

Diagram ref no 8

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

95B122447E
95B122447E
95B122447

The product you are viewing cross references to these numbers
Special Order item
95B121407
Product Information
Product Information
Expansion tank. without lid, with sensor.

porsche

Fits:
Porsche 95B.1 Macan S / GTS 3.0L 2014-18
Porsche 95B.1 Macan Turbo 3.6L 2014-18

Click 'Zoom in' for large parts diagram.
Diagram ref no 1

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

95B121407
95B122447C
95B122447D
95B121407

The product you are viewing cross references to these numbers
95B121407/1
Product Information
Product Information
Expansion tank.

Fits:
Porsche 95B.1 Macan S / GTS 3.0L 2014-18
Porsche 95B.1 Macan Turbo 3.6L 2014-18

Diagram ref no 1

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

95B121407
95B122447C
95B122447D
95B121407
454050

The product you are viewing cross references to these numbers
95B121407/2
Product Information
Product Information
Expansion tank.

oematch

Fits:
Porsche 95B.1 Macan S / GTS 3.0L 2014-18
Porsche 95B.1 Macan Turbo 3.6L 2014-18

Click 'Zoom in' for large parts diagram.
Diagram ref no 1

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

95B121407
95B122447C
95B122447D
95B121407

The product you are viewing cross references to these numbers
Special Order item
95810644700
Product Information
Product Information
Lid for water coolant expansion tank.

porsche

Fits:
Porsche 958 Cayenne 2011-18
Porsche 95B Macan 2014-18

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

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

95810644700
95810615102
95810615100
95810644700

The product you are viewing cross references to these numbers
95810644700/1
Product Information
Product Information
Lid for water coolant expansion tank.

oematch

Fits:
Porsche 958 Cayenne 2011-18
Porsche 95B Macan 2014-18
Porsche 971.1 Panamera 2017- 21
Porsche 971.2 Panamera 2021>>

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

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

95810644700
95810644700

The product you are viewing cross references to these numbers
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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