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Expansion Tank Hoses
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
The OE Match Expansion Tank Hose is a high-quality replacement cooling system component designed to connect the coolant expansion tank to the engine cooling circuit. Manufactured to OE specifications for fit, durability and performance, this hose ensures the safe transfer of coolant and allows the cooling system to regulate pressure and coolant volume as temperatures change during engine operation.
Fits:
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
Diagram Ref No 21
Constructed from heat-resistant, coolant-resistant materials, the expansion tank hose is designed to withstand continuous exposure to high temperatures, pressure fluctuations and chemical additives found in modern coolant systems. It plays a critical role in maintaining cooling system efficiency, engine temperature control and overall reliability.
What This Product Does:
- Connects the coolant expansion tank to the cooling system.
- Allows coolant to flow between the expansion tank and engine cooling circuit.
- Helps regulate cooling system pressure.
- Accommodates coolant expansion and contraction during temperature changes.
- Supports efficient engine temperature management.
- Helps prevent coolant loss and system leaks.
- Maintains the integrity of the engine cooling system.
Symptoms Of Wear Or Failure:
- Visible coolant leaks around the hose or connections.
- Coolant drips beneath the vehicle.
- Low coolant level warnings.
- Engine overheating or rising coolant temperatures.
- Coolant residue or staining around hose fittings.
- Sweet coolant smell from the engine bay.
- Cracking, swelling, hardening or softening of the hose material.
- Bulging sections caused by internal deterioration.
- Loss of cooling system pressure.
Why Replacement Matters:
- Expansion tank hoses operate in demanding conditions and are constantly exposed to heat cycles, pressure fluctuations, coolant chemicals and environmental ageing. Over time, the hose material can become brittle, cracked, swollen or weakened, increasing the risk of coolant leaks and cooling system failure.
- A failing expansion tank hose can lead to coolant loss, reduced cooling system efficiency and overheating. If coolant levels drop significantly, critical engine components may be exposed to excessive temperatures, potentially resulting in costly engine damage. Even minor leaks can worsen over time and compromise overall vehicle reliability.
- Replacing a worn expansion tank hose restores proper coolant circulation and cooling system pressure management. An OE Match replacement provides factory-style fitment, dependable durability and long service life, helping maintain optimal engine operating temperatures and protecting your Porsche from cooling system-related issues.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410625100
The product you are viewing cross references to these numbers
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
To fit:
Porsche 968 3.0 (i4) 236bhp 1992-1995
These hoses are entirely manufactured in high quality silicone for best finish and durability. With three to five layers of reinforcement, depending of the inner diameter, the hoses withstand high pressure rates and high temperatures for a long time. The original hoses are manufactured in rubber that often cracks from age.
This is the durable solution for you that in addition improves the appearance!
Hoses Included:
• Upper radiator hose OE Reference: 94410623911
• Lower radiator hose OE Reference: 95110623704
• Radiator bleed hose OE Reference: 95110624901
• Throttle body preheating hose OE Reference: 94410623604
• Other radiator hoses OE Reference: 94410624104
• Other radiator hoses OE Reference: 94410625301
• Heater hose OE Reference: 94457258900
• Heater hose OE Reference: 94457258702
• Expansion tank hose OE Reference: 94410621705
• Expansion tank hose OE Reference: 94410625100
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
DO88-KIT178S
The product you are viewing cross references to these numbers
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
Fits:
Porsche 924S 1986-88
Porsche 944 1985-91
Porsche 968 1992-95
Click 'Zoom in' for large parts diagram.
Diagram ref no 27
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410692700
The product you are viewing cross references to these numbers
- Porsche 924S 2.5L 1986-87
- Porsche 924S 2.5L 1988
- Porsche 944 2.5L 8V 1982-87
- Porsche 944 2.7L 8V 1988-89
- Porsche 944S 2.5L 16V 1987-88
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
Reference number: 94410692700.
Fits:
Porsche 924S 1986-88
Porsche 944 1985-91
Porsche 968 1992-95
Here you will receive a screw-in connector made of aluminium for the radiator of your Porsche 924, 944 II, 944 turbo and 968, which connects the radiator with the hose of the expansion tank.
Made in Germany
Click 'Zoom in' for large parts diagram.
Diagram ref no 27
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410692700
The product you are viewing cross references to these numbers
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
Fits:
Porsche 968 1992-95
Click 'Zoom in' for large parts diagram.
Diagram ref no 18
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
94410621705
The product you are viewing cross references to these numbers
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.
