Heater Hose MD309336
OEM reference MD309336
The Heater Hose is a flexible fluid line located within the vehicle cooling system, connecting the engine to the cabin heater core.
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This component channels hot coolant from the engine block into the passenger compartment to provide cabin heating and assist with defrosting. Over time, constant exposure to high temperatures, pressure fluctuations, and vibration leads to rubber degradation, hardening, and coolant leaks, which require timely replacement to prevent engine overheating.
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