Engine coolant radiator water tank back water hose OE 31368752 Expansion tank breather hose for Volvo

Product Description:

Radiator coolant hose
OE NO.:  31368752 31686893

Applicable vehicle type: For Volvo

The radiator bleed hose serves as a vital auxiliary conduit within the automotive cooling system, responsible for expelling or channelling air trapped within the system. Typically positioned between the radiator's upper outlet, the engine cylinder head's vent, and the expansion tank, it prevents accumulated air from impairing heat dissipation. This component plays a crucial role in ensuring the engine's stable operation.

Core Functions

• Air Evacuation and Air Lock Prevention: Air can be inadvertently introduced into the cooling system during coolant filling. If trapped air pockets form, they obstruct coolant circulation, leading to inadequate engine cooling, localised overheating, or even damage. This hose directs air from the cooling system through specific pathways to the expansion tank for expulsion, ensuring unimpeded coolant flow.
• Maintaining System Pressure Stability: Working in tandem with the expansion tank, it accommodates the thermal expansion and contraction of coolant. When coolant expands due to heat, excess coolant and air flow through this hose into the expansion tank. Conversely, during cooling contraction, negative pressure within the system allows coolant to flow back through designated channels, preventing abnormal pressure fluctuations.
• Auxiliary protection for the cooling system: On certain vehicle models, this hose also prioritises the expulsion of air from high-temperature critical areas such as cylinder heads. This reduces air-induced oxidation and corrosion of the pipe inner walls while mitigating localised overpressure caused by air locks, thereby indirectly safeguarding core components like the radiator and water pump.

• 20 years of specialized auto parts industry experience
• Expert technical team for comprehensive support
• Direct partnerships with repair shops for real-world feedback
• Premium quality parts ensuring reliability and durability
• 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
• Competitive pricing through optimized supply chains
• Rigorous quality control meeting industry standards
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