Water Coolant Hose, Top. Porsche 944S / 944S2  ❭  94410623906

Radiator Top Hose 

Maintain reliable engine cooling and protect your Porsche from overheating with this OE Match Radiator Top Hose, designed specifically for the Porsche 944 S and Porsche 944 S2. Manufactured to original equipment specifications, this high-quality replacement hose ensures efficient coolant circulation between the engine and radiator, helping your cooling system operate at peak performance.

Fits:

• Porsche 944S 2.5L 16V 1987-88
• Porsche 944S2 3.0L 16V 1989-91

Diagram ref no 25

The radiator top hose is one of the most important components in the engine cooling system. It carries hot coolant from the engine to the radiator, where heat is dissipated before the coolant returns to the engine. Because it operates under constant pressure and high temperatures, the hose naturally deteriorates over time and should be inspected regularly as part of routine maintenance.

This OE Match replacement provides the correct fit, flexibility and durability required to restore the cooling system to factory performance.

What Does the Radiator Top Hose Do?

The radiator top hose connects the engine to the upper section of the radiator.

Its primary functions include:

Carrying hot coolant from the engine to the radiator Maintaining continuous coolant circulation Helping regulate engine operating temperature Supporting efficient heat transfer Preventing overheating Maintaining cooling system pressure Ensuring reliable engine performance

Without a properly functioning top hose, coolant circulation is compromised, increasing the risk of overheating and engine damage.

Why Do Radiator Top Hoses Fail?

Cooling hoses are subjected to continuous heat, pressure and vibration throughout their service life.

Common causes of failure include:

• Age-related rubber deterioration
• Heat cycling
• Internal coolant contamination
• Pressure fatigue
• Oil contamination
• Cracking and hardening
• Swelling
• Perishing of the rubber compound

As the hose ages, it becomes less flexible and more prone to splitting or leaking.

Symptoms of a Failing Radiator Top Hose

Signs that the hose may require replacement include:

• Coolant leaks
• Cracked or perished rubber
• Soft or swollen hose walls
• Visible bulging
• Steam from the engine bay
• Sweet smell of coolant
• Engine overheating
• Low coolant warning

If left unattended, a failed radiator hose can quickly lead to significant coolant loss and potential engine damage.

When Should the Radiator Top Hose Be Replaced?

Replacement is recommended when:

• Carrying out cooling system servicing
• Replacing the radiator
• Replacing the thermostat or water pump
• Any signs of cracking or swelling are present
• Coolant leaks develop
• Completing an engine rebuild
• Restoring a Porsche 944 S or 944 S2
• Performing preventative maintenance on older vehicles

Many Porsche specialists recommend replacing ageing coolant hoses together to maximise long-term reliability.

Why Replacement Matters

Replacing an ageing radiator hose helps maintain the efficiency of the entire cooling system.

Benefits include:

• Reliable coolant circulation
• Reduced risk of overheating
• Improved cooling system performance
• Prevention of coolant leaks
• Increased engine reliability
• Greater peace of mind Long-term durability
• Factory-correct fit and performance

Preventative replacement is considerably less expensive than repairing engine damage caused by coolant loss.

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