NISSAN 21307-VC205 Water Hose

The genuine OEM NISSAN 21307-VC205 water hose is an essential component of the vehicle cooling system. Its function is to provide safe and leak-free coolant routing between the engine block, radiator, thermostat housing, or other cooling circuit components, contributing to the maintenance of optimal engine operating temperature and preventing overheating.

Technical Specifications and Construction

This original Nissan water hose is manufactured in accordance with strict factory standards, ensuring a precise fit and long service life. It is designed to withstand the extreme operating conditions of the cooling system:

• Manufacturer: NISSAN (Genuine OEM part)
• Part Number: 21307-VC205
• Material: Premium-quality, heat- and ozone-resistant EPDM rubber that withstands glycol and chemical additives found in engine coolant.
• Reinforcement: Features internal synthetic fiber reinforcement (textile ply) to prevent expansion and bursting under high operating pressure.
• Thermal Resistance: Excellent tolerance to high temperatures (effective range from -40°C to +135°C).
• Design: Precision pre-molded factory geometry for stress-free installation.

Signs of Failure and Importance

Over time, water hoses degrade due to continuous thermal cycles and mechanical stress. The most common signs of failure include:

• Visible cracking, material fatigue, or hardening on the hose surface.
• Coolant leakage at connection points or through micro-cracks in the hose body.
• Softening of the hose wall (spongy feel), indicating breakdown of the inner lining.
• Localized bulging, indicating ruptured reinforcement fibers and an imminent risk of bursting.

Replacing a damaged or aged water hose is critical, as a sudden loss of coolant can lead to immediate engine overheating and severe, costly engine damage.