NISSAN 21752-VC30A Expansion Tank Connector Hose

The genuine Nissan expansion tank hose (part number: 21752-VC30A) is an essential component of the vehicle's cooling system. This high-pressure connector hose ensures coolant flow between the expansion tank and other components of the engine cooling circuit, maintaining optimal system pressure levels and preventing coolant leaks.

Technical Features and Specifications

• Manufacturer: NISSAN (Genuine OEM part)
• Part Number: 21752-VC30A
• Part Type: Expansion Tank Hose / Connector Hose
• Material: Premium quality, fiber-reinforced EPDM rubber, offering exceptional resistance to glycol-based coolants, ozone, and electrochemical degradation.
• Temperature Range: Long-term resistance against high engine temperatures (-40°C to +135°C).
• Design: Molded and dimensioned to factory specifications for a stress-free, accurate fit.

Function and Importance

The expansion tank hose plays a critical role in managing expansion processes within the cooling system. As the coolant heats up and expands, excess fluid flows through this hose into the expansion tank, returning to the system as the engine cools down. The factory-grade hose ensures that the system remains sealed and pressurized, which is vital for raising the coolant boiling point.

Typical Symptoms of Failure

Natural aging of rubber components, high operating temperatures, and vibration lead to hose degradation over time. Replacement of the hose is recommended upon noticing any of the following issues:

• Visible cracks or weathering on the outer jacket of the hose.
• Hardening and loss of flexibility, or conversely, sponginess and softening of the hose material.
• Coolant leakage around connection points (hose clamps) or through micro-fissures.
• Persistent drop in engine coolant level.