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PorscheMacan (95B) MK3 2022>>95B.3 Macan GTS Petrol 2.9L V6 (440Bhp) 2022>>Engine CoolingCoolant Hoses and Pipes (Front engine cars)

Expansion Tank Hoses

Expansion Tank Hoses

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Coolant Expansion Tank Breather Line, for Right Hand Drive (RHD). Porsche 95B.2 / 95B.3 Macan 2019>> - 95B121071A
1
Coolant Expansion Tank Breather Line, for Right Hand Drive (RHD). Porsche 95B.2 / 95B.3 Macan 2019>>
Special Order item
95B121071A
Product Information
Product Information

This Porsche coolant expansion tank breather line provides the cooling system ventilation connection on the specified right-hand drive Macan models. Fits the expansion tank arrangement subject to the PR:L0R and GP1 / GP2 qualifications below.

Fits:

  • Porsche 95B.2 Macan Petrol 2.0L (245Bhp) 2019–21
  • Porsche 95B.2 Macan S Petrol 3.0L V6 (354Bhp) 2019–21
  • Porsche 95B.2 Macan GTS Petrol 2.9L V6 (380Bhp) 2019–21
  • Porsche 95B.2 Macan Turbo 2.9L V6 (440Bhp) 2019–21
  • Porsche 95B.3 Macan Petrol 2.0L (265Bhp) 2022>>
  • Porsche 95B.3 Macan T Petrol 2.0L (265Bhp) 2022>>
  • Porsche 95B.3 Macan S Petrol 2.9L V6 (380Bhp) 2022>>
  • Porsche 95B.3 Macan GTS Petrol 2.9L V6 (440Bhp) 2022>>


Diagram Ref No 7

Check fitment for your specific vehicle (model, year, engine) before ordering, including the PR:L0R and GP1 / GP2 qualifications.


What Is This Part?
This breather line forms part of the coolant expansion tank ventilation arrangement. It provides a passage through which air in the cooling circuit can reach the expansion tank, working alongside the tank and associated coolant pipework. Its condition matters both for keeping that passage clear and for maintaining sealed connections within the cooling system. The right-hand drive qualification identifies the applicable installation and must be checked when selecting a replacement.


What Does This Part Do?

  • Provides a breather passage: Allows air to travel towards the coolant expansion tank through the intended ventilation route.
  • Connects the ventilation circuit: Joins the expansion tank arrangement to its associated cooling system pipework.
  • Contains coolant: An intact line with correctly seated connections helps keep coolant within the circuit.


Why Replace This Part?
Replace the line if inspection confirms cracking, abrasion, distortion or leakage that prevents it from functioning correctly. Damage can allow coolant to escape, while a blocked or deformed passage can interfere with the intended ventilation route. Damp connections, dried coolant deposits or repeated coolant loss should prompt inspection of the line together with the tank and neighbouring pipework.

During expansion tank repairs, check the line and its connection points before refitting. Renew it if damage prevents secure seating or a sound seal; removing the tank does not automatically mean the breather line needs replacement. Coolant smells or gurgling alone do not identify this line as the cause, so confirm the source before changing parts.


When to Replace This Part?

  • Confirmed leakage: Fresh dampness or dried coolant residue is traced to the line or its connections.
  • Visible damage: Cracks, splits, rubbing damage or distortion affect the line.
  • Damaged connections: A connection is broken or cannot seat securely.
  • Restricted passage: Inspection confirms a blockage or deformation affecting the breather route.
  • Damage during repair: Removal or refitting leaves the line unable to reconnect correctly.


Where Is This Part Fitted?
Location: At the coolant expansion tank breather connection and associated cooling system pipework on the specified right-hand drive Macan applications.


Product Summary

  • Product: Coolant expansion tank breather line.
  • Brand: Porsche.
  • Part number: 95B121071A.
  • Fitment qualification: PR:L0R (Right-Hand drive), with +GP1 or +GP2.
  • Purpose: Provides the breather passage associated with the coolant expansion tank.


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

95B121071A
95B121071A

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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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