Please wait… 
Please wait while we process your order,
do not press the back button… 
Design 911 Design 911 supply Porsche parts, Porsche spares and Porsche accessories, to both retail and to the trade. Our Porsche product and accessory range includes brakes, exhausts, tyres, wheels and Porsche panels and interiors. https://www.design91.uk/images/schemaLogo.png https://www.design91.uk/images/schemaLogo.png +443456003478 https://www.design91.uk Facebook Instagram
Porsche specialists based in the UK
Porsche > Panamera 971 MK1 (2017-2020) > 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD Executive 2017-20 > Engine Cooling > Coolant Hoses and Pipes >

Expansion Tank Hoses

Expansion Tank Hoses

Filter by brand
DISPLAYING 1 to 4 (of 4 products)
Breather Line, Reservoir. Porsche 971.1 / 971.2 / 976 Panamera 2017>> - 9A712244710
2
Breather Line, Reservoir. Porsche 971.1 / 971.2 / 976 Panamera 2017>>
Special Order item
9A712244710
Product Information
Product Information
Breather Line, Reservoir. 
Maintain proper engine and cooling system ventilation with the Breather Line, Reservoir. This component is designed to route air and vapor from the reservoir system, helping regulate pressure and support smooth, efficient operation.

Fits:
  • Porsche 971.1 Panamera V6 3.0L 2WD (330 Hp) 2017-20
  • Porsche 971.1 Panamera 4 V6 3.0L 4WD (330 Hp) 2017-20
  • Porsche 971.1 Panamera 4 V6 3.0L 4WD Executive 2017-20
  • Porsche 971.1 Panamera 4 3.0L Turbocharged V6 Sport Turismo 2017-20
  • Porsche 971.1 Panamera 4S V6 3.0L 4WD (440 Hp) 2017-20
  • Porsche 971.1 Panamera 4S V6 3.0L 4WD Executive 2017-20
  • Porsche 971.1 Panamera 4S 2.9L Twin-Turbo V6 Sport Turismo 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD Executive 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid 2.9L Twin-Turbo V6 Sport Turismo 2017-20
  • Porsche 971.2 Panamera 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 E-Hybrid 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 E-Hybrid Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S E-Hybrid 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S E-Hybrid Sport Turismo 2.9L V6 2021-23
  • Porsche 976 Panamera V6 2.9L 2023>>
  • Porsche 976 Panamera 4 V6 2.9L 2023>>
  • Porsche 976 Panamera 4 E-Hybrid V6 2.9L 2023>>
  • Porsche 976 Panamera 4S E-Hybrid V6 2.9L 2023>>  

Diagram Ref No 9

What This Product Does:

  • Releases trapped air and pressure from the reservoir system
  • Helps prevent pressure buildup that can stress hoses and seals
  • Supports proper coolant reservoir operation during heating/cooling cycles
  • Maintains stable cooling system performance

Symptoms Of Wear Or Failure:
  • Coolant or vapor leaks near the reservoir area
  • Sweet coolant smell from the engine bay
  • Cracked, brittle, or collapsed hose material
  • Loose or damaged hose connections
  • Coolant residue buildup around fittings or clamps
  • Pressure buildup in the cooling system (may cause swelling hoses)
  • Coolant loss over time without obvious major leaks
  • Check engine light (in some cases, if pressure/venting issues affect sensors)

Why Replacement Matters:
  • The reservoir breather line plays a key role in allowing the cooling system to safely vent air and vapor as temperatures rise and fall. If this line becomes cracked, brittle, or blocked, it can lead to improper pressure regulation within the system.
  • Failure to replace a worn breather line may result in coolant leaks, pressure buildup, stressed hoses or seals, and reduced cooling system efficiency. Over time, this can contribute to overheating or additional component damage.
  • Replacing the breather line helps maintain proper system ventilation, prevents unnecessary strain on cooling components, and supports long-term engine reliability.



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

9A712244710
9A712244710

The product you are viewing cross references to these numbers
Breather Line, Reservoir. Porsche 971.1 / 971.2 / 976 Panamera 2017>> - 9A712244710
2
Breather Line, Reservoir. Porsche 971.1 / 971.2 / 976 Panamera 2017>>
9A712244710/1
Product Information
Product Information
Breather Line, Reservoir. 
Maintain proper engine and cooling system ventilation with the OE MATCH Breather Line, Reservoir. This component is designed to route air and vapor from the reservoir system, helping regulate pressure and support smooth, efficient operation.

Fits:
  • Porsche 971.1 Panamera V6 3.0L 2WD (330 Hp) 2017-20
  • Porsche 971.1 Panamera 4 V6 3.0L 4WD (330 Hp) 2017-20
  • Porsche 971.1 Panamera 4 V6 3.0L 4WD Executive 2017-20
  • Porsche 971.1 Panamera 4 3.0L Turbocharged V6 Sport Turismo 2017-20
  • Porsche 971.1 Panamera 4S V6 3.0L 4WD (440 Hp) 2017-20
  • Porsche 971.1 Panamera 4S V6 3.0L 4WD Executive 2017-20
  • Porsche 971.1 Panamera 4S 2.9L Twin-Turbo V6 Sport Turismo 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD Executive 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid 2.9L Twin-Turbo V6 Sport Turismo 2017-20
  • Porsche 971.2 Panamera 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 E-Hybrid 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 E-Hybrid Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S E-Hybrid 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S E-Hybrid Sport Turismo 2.9L V6 2021-23
  • Porsche 976 Panamera V6 2.9L 2023>>
  • Porsche 976 Panamera 4 V6 2.9L 2023>>
  • Porsche 976 Panamera 4 E-Hybrid V6 2.9L 2023>>
  • Porsche 976 Panamera 4S E-Hybrid V6 2.9L 2023>>  

Diagram Ref No 9

What This Product Does:

  • Releases trapped air and pressure from the reservoir system
  • Helps prevent pressure buildup that can stress hoses and seals
  • Supports proper coolant reservoir operation during heating/cooling cycles
  • Maintains stable cooling system performance

Symptoms Of Wear Or Failure:
  • Coolant or vapor leaks near the reservoir area
  • Sweet coolant smell from the engine bay
  • Cracked, brittle, or collapsed hose material
  • Loose or damaged hose connections
  • Coolant residue buildup around fittings or clamps
  • Pressure buildup in the cooling system (may cause swelling hoses)
  • Coolant loss over time without obvious major leaks
  • Check engine light (in some cases, if pressure/venting issues affect sensors)

Why Replacement Matters:
  • The reservoir breather line plays a key role in allowing the cooling system to safely vent air and vapor as temperatures rise and fall. If this line becomes cracked, brittle, or blocked, it can lead to improper pressure regulation within the system.
  • Failure to replace a worn breather line may result in coolant leaks, pressure buildup, stressed hoses or seals, and reduced cooling system efficiency. Over time, this can contribute to overheating or additional component damage.
  • Replacing the breather line helps maintain proper system ventilation, prevents unnecessary strain on cooling components, and supports long-term engine reliability.



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

9A712244710
9A712244710

The product you are viewing cross references to these numbers
Coolant Hose For Reservoir, Lower. Porsche 971.1 / 971.2 Panamera 2.9L 2017-24 - 9A712210911, 9A712210910
2
Coolant Hose For Reservoir, Lower. Porsche 971.1 / 971.2 Panamera 2.9L 2017-24
Special Order item
9A712210911
Product Information
Product Information
Coolant Hose For Reservoir, Lower.
Maintain proper coolant circulation and engine temperature control with the Coolant Hose for Reservoir, Lower. This hose is designed to connect the coolant reservoir to the cooling system, helping ensure consistent coolant flow and reliable system pressure.

Fits:
  • Porsche 971.1 Panamera 4S 2.9L Twin-Turbo V6 Sport Turismo 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD Executive 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid 2.9L Twin-Turbo V6 Sport Turismo 2017-20
  • Porsche 971.2 Panamera 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 E-Hybrid 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 E-Hybrid Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S E-Hybrid 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S E-Hybrid Sport Turismo 2.9L V6 2021-23 
 
Diagram Ref No 10

What This Product Does:

  • Transfers coolant to and from the coolant reservoir
  • Helps maintain the correct coolant level and circulation
  • Supports proper cooling system pressure regulation
  • Prevents overheating by ensuring consistent coolant flow
  • Helps the engine cooling system operate efficiently

Symptoms Of Wear Or Failure:
  • Coolant leaks near the reservoir or under the vehicle
  • Low coolant warning light or repeated coolant top-offs
  • Engine running hotter than normal
  • Visible cracks, splits, or swelling in the hose
  • Soft, spongy, or brittle rubber texture
  • Coolant residue or dampness around hose connections
  • Sweet coolant smell from the engine bay
  • Steam from under the hood (in severe cases)

Why Replacement Matters:
  • Replacing a worn or damaged lower coolant reservoir hose is critical to maintaining proper cooling system performance. This hose helps regulate coolant flow between the reservoir and engine, ensuring consistent pressure and temperature control.
  • Over time, heat and pressure can cause the hose to crack, weaken, or leak. If not replaced, a failing hose can lead to coolant loss, overheating, and potentially severe engine damage. Prompt replacement helps prevent breakdowns, protects vital engine components, and ensures long-term reliability.
  • Installing a new hose restores proper coolant circulation and helps keep your engine operating at a safe and stable temperature.



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

9A712210911
9A712210911
9A712210910

The product you are viewing cross references to these numbers
Coolant Hose For Reservoir, Lower. Porsche 971.1 / 971.2 Panamera 2.9L 2017-24 - 9A712210911, 9A712210910
2
Coolant Hose For Reservoir, Lower. Porsche 971.1 / 971.2 Panamera 2.9L 2017-24
9A712210911/1
Product Information
Product Information
Coolant Hose For Reservoir, Lower.
Maintain proper coolant circulation and engine temperature control with the OE MATCH Coolant Hose for Reservoir, Lower. This hose is designed to connect the coolant reservoir to the cooling system, helping ensure consistent coolant flow and reliable system pressure.

Fits:
  • Porsche 971.1 Panamera 4S 2.9L Twin-Turbo V6 Sport Turismo 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid V6 2.9L 4WD Executive 2017-20
  • Porsche 971.1 Panamera 4 E-Hybrid 2.9L Twin-Turbo V6 Sport Turismo 2017-20
  • Porsche 971.2 Panamera 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 E-Hybrid 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4 E-Hybrid Sport Turismo 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S E-Hybrid 2.9L V6 2021-23
  • Porsche 971.2 Panamera 4S E-Hybrid Sport Turismo 2.9L V6 2021-23 
 
Diagram Ref No 10

What This Product Does:

  • Transfers coolant to and from the coolant reservoir
  • Helps maintain the correct coolant level and circulation
  • Supports proper cooling system pressure regulation
  • Prevents overheating by ensuring consistent coolant flow
  • Helps the engine cooling system operate efficiently

Symptoms Of Wear Or Failure:
  • Coolant leaks near the reservoir or under the vehicle
  • Low coolant warning light or repeated coolant top-offs
  • Engine running hotter than normal
  • Visible cracks, splits, or swelling in the hose
  • Soft, spongy, or brittle rubber texture
  • Coolant residue or dampness around hose connections
  • Sweet coolant smell from the engine bay
  • Steam from under the hood (in severe cases)

Why Replacement Matters:
  • Replacing a worn or damaged lower coolant reservoir hose is critical to maintaining proper cooling system performance. This hose helps regulate coolant flow between the reservoir and engine, ensuring consistent pressure and temperature control.
  • Over time, heat and pressure can cause the hose to crack, weaken, or leak. If not replaced, a failing hose can lead to coolant loss, overheating, and potentially severe engine damage. Prompt replacement helps prevent breakdowns, protects vital engine components, and ensures long-term reliability.
  • Installing a new hose restores proper coolant circulation and helps keep your engine operating at a safe and stable temperature.



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

9A712210911
9A712210911
9A712210910

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

You may also like
Popular Models