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Porsche > Macan (95B) MK1 (2014-2018) > 95B.1 Macan GTS Petrol 3.0L V6 (360Bhp) 2014-18 > Engine Cooling > Coolant Hoses and Pipes (Front engine cars) >

Expansion Tank Hoses

Expansion Tank Hoses

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DISPLAYING 1 to 2 (of 2 products)
Breather Line For Water Tank. Porsche 95B Macan 3.0L / 3.6L 2014-18 - 95B121447, 95B121447E
2
Breather Line For Water Tank. Porsche 95B Macan 3.0L / 3.6L 2014-18
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
Breather Line For Water Tank. Porsche 95B Macan 3.0L / 3.6L 2014-18 - 95B121447, 95B121447E - 88876
2
Breather Line For Water Tank. Porsche 95B Macan 3.0L / 3.6L 2014-18
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
DISPLAYING 1 to 2 (of 2 products)
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About Expansion Tank Hoses

Expansion Tank Coolant Hoses – Reliable Cooling Connections for Porsche Vehicles

Expansion tank coolant hoses are essential components in your Porsche’s cooling system. They connect the coolant expansion tank (reservoir) to the radiator, water pump, and engine, allowing the system to maintain correct pressure and coolant levels during operation. These hoses ensure that excess coolant flows smoothly between the tank and the rest of the system — preventing overheating, leaks, and pressure loss.

At Design911, we supply a full range of genuine and manufacturer-quality expansion tank coolant hoses for Porsche models including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each hose is engineered for precise fitment, heat resistance, and long-term durability, ensuring your Porsche’s cooling system performs exactly as intended by the manufacturer.

What Do Expansion Tank Coolant Hoses Do?

Expansion tank hoses act as the link between the coolant reservoir and the engine cooling circuit, helping to:

  • Transport coolant to and from the expansion tank as temperatures fluctuate.
  • Maintain proper pressure balance within the cooling system.
  • Allow coolant recovery as the system heats up and cools down.
  • Prevent air pockets that can cause inefficient cooling or engine overheating.

Without properly functioning hoses, the cooling system cannot maintain the balance of pressure and temperature required for optimal performance.

Why Do Expansion Tank Coolant Hoses Fail?

Due to constant exposure to heat, pressure, and coolant chemicals, these hoses can degrade or fail over time. Common causes include:

  • Rubber fatigue or cracking from repeated heat cycles.
  • Coolant leaks caused by weakened hose ends or clamps.
  • Swelling or softening from prolonged coolant contact.
  • Aging materials losing elasticity and sealing ability.
  • Corrosion or contamination around connectors and fittings.

Typical signs of failure include visible cracks, coolant leaks near the expansion tank, fluctuating coolant levels, or overheating warnings.

Why Replace Faulty Expansion Tank Coolant Hoses?

A damaged or leaking expansion tank hose can cause coolant loss, air pockets, or pressure imbalance, leading to overheating or potential engine damage. Replacing these hoses is a simple but critical maintenance step to keep your Porsche’s cooling system running reliably.

Benefits of replacement include:

  • Restored coolant flow and pressure regulation.
  • Prevention of leaks and air ingress.
  • Enhanced engine performance and temperature stability.
  • Long-lasting, manufacturer-quality durability and fitment.

All hoses in this range are made using high-grade, reinforced materials designed to meet or exceed factory standards, ensuring exceptional performance, heat resistance, and reliability under all driving conditions.

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