Water coolant pipe Engine coolant hose for Volvo Coolant By-Pass hose OE 30713530 Radiator hoses

Product Description:

Coolant by-pass hose
OE NO.:  32203162 30713530

Applicable vehicle type: For Volvo

The automotive coolant hose (also known as the radiator hose) is a flexible rubber tube within the vehicle's cooling system that conveys coolant. It connects components such as the engine, radiator, and heater core, ensuring the engine coolant circulates within a closed loop to regulate engine temperature. Comprising inner and outer rubber layers with a reinforcing layer, these hoses exhibit properties such as pressure resistance, high-temperature tolerance, and ageing resistance, enabling long-term stable operation under high-temperature and high-pressure conditions. As a critical component of the engine cooling system, failure of the coolant hose can lead to coolant leakage, engine overheating, and even severe mechanical malfunctions. Consequently, its quality and reliability are of paramount importance.

Coolant hoses are extensively employed in engine cooling systems across various vehicle types. Their primary function is to transport coolant from the engine to the radiator for heat dissipation, then return the cooled fluid to the engine. They also connect to the heater core to supply cabin heating. Typical applications include:

• Radiator inlet hose: Connects the engine cylinder head outlet chamber to the radiator inlet, conveying high-temperature coolant from the engine for cooling.
• Radiator outlet hose: Connects the radiator outlet to the engine block inlet, returning cooled coolant to the engine for recirculation.
• Heater hose: Connects the engine block or radiator to the heater core, heating air through the heater core to warm the cabin. Typically located within the engine compartment where temperatures are relatively low, yet still requiring resistance to coolant corrosion and adequate flexibility.
• Thermostat bypass hose: Some vehicles feature a thermostat bypass hose, providing a small-circulation path around the thermostat. This maintains a low coolant flow rate before the engine reaches operating temperature, accelerating warm-up.
• Reservoir (expansion tank) hose: Connecting the expansion tank to the cooling system, this hose balances system pressure and replenishes coolant. One end attaches to the reservoir, the other to the radiator or pump vicinity, requiring resistance to coolant and moderate vacuum pressure.

Beyond the engine cooling system, coolant hoses are also employed in some vehicles' heating systems and auxiliary cooling circuits. In high-performance or modified vehicles, silicone coolant hoses are frequently used in critical cooling lines to enhance cooling efficiency and reliability. Overall, coolant hoses are present in virtually all automotive cooling circuits, ensuring the engine maintains an appropriate operating temperature range under diverse conditions.

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