Car Radiator hose expansion tank pipe OE 31319441 Radiator coolant pipe for Volvo Upper radiator engine coolant hose

Product Description:

Expansion reservoir pipe
OE NO.:  31319441 31319444

Applicable vehicle type: For Volvo

The expansion tank pipe, also commonly referred to as the expansion reservoir pipe or expansion tank connecting pipe, serves as a critical link within the automotive cooling system. It connects the expansion reservoir to the radiator and engine cooling lines, playing an essential role in maintaining coolant circulation and system pressure stability.

Core Functionality

• Enables coolant circulation and volume regulation: As the primary connecting conduit, it establishes a pathway between the expansion reservoir and the radiator, as well as the engine's rigid cooling lines. When engine operation causes coolant to heat and expand, it directs excess coolant into the expansion tank for storage. As coolant cools and contracts, stored coolant is returned to the main cooling system, preventing insufficient coolant levels.
• Maintains System Pressure: Works with the expansion tank to preserve pressure equilibrium within the cooling system. It prevents excessive pressure buildup during coolant heating, averting coolant spray or damage to cooling components. simultaneously ensuring adequate pressure at the water pump inlet. This minimises vapour bubble formation on the suction side due to low pressure, thereby preventing cavitation damage to components.
• Auxiliary air trap prevention: During coolant circulation, it assists in directing trapped air within the system into the expansion tank. This reduces the likelihood of air pockets forming within the cooling system, preventing reduced heat dissipation efficiency caused by air traps and ensuring stable engine cooling performance.

• 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
• Responsive customer service with quick turnaround
• 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
• Efficient global shipping via multiple carriers