New coolant breather pipe 31319051 Engine radiator water hose for Volvo Water tank kettle hose

Product Description:

Coolant breather hose
OE NO.: 31319051 31319053

Applicable vehicle type: For Volvo

The automotive coolant vent pipe, commonly referred to as the coolant bleed pipe, is a critical component within the vehicle's cooling system. It serves to equalise pressure, expel air, and assist coolant circulation, playing a vital role in ensuring stable engine operation.

Core Functions

• Expelling Air from the Cooling System: Air can become trapped within the engine cooling system during coolant refilling or operation. Accumulated air forms air locks, obstructing coolant circulation and causing localised poor heat dissipation. This vent pipe guides such air out, preventing localised engine overheating.
• Balancing System Pressure: As coolant heats and expands during engine operation, internal system pressure increases. After shutdown, as coolant cools and contracts, negative pressure develops within the system. The coolant vent pipe works in conjunction with components such as the expansion tank to equalise internal and external system pressures, preventing damage to pipes or seals due to abnormal pressure fluctuations within the cooling system.
• Assisting coolant return flow: On certain vehicle models, the vent pipe connects the expansion tank to the engine's cooling circuit. When coolant expands into the expansion tank due to temperature changes, it can flow smoothly back into the main cooling circuit via the vent pipe as it cools and contracts, ensuring adequate coolant volume within the system.

Common Faults and Replacement Indicators

This component operates continuously under high temperature and pressure conditions, making it prone to ageing and cracking. Coolant leakage, frequent engine overheating, or abnormal fluctuations in the temperature gauge reading typically indicate a damaged coolant vent pipe. Failure to replace it promptly may reduce cooling system efficiency and, in severe cases, cause irreversible damage such as engine cylinder scoring or block cracking. When replacing, it is advisable to select products conforming to original equipment manufacturer (OEM) specifications. This should be accompanied by maintenance procedures such as coolant flushing to safeguard the overall performance of the cooling system.

• 20 years of specialized auto parts industry experience
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• Extensive inventory with over 500,000+ items ready to ship
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• Customized solutions for specific vehicle requirements
• Professional technical guidance and installation support
• Comprehensive 12-month warranty coverage
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