Your Mazda6's coolant system depends on a large amount of radiator/cooling system hoses which are designed to keep your engine from overheating. The coolant hoses carry coolant through the radiator and then back through the engine to keep the engine running at an optimal temperature. The upper hose connects the top of the radiator to the top of the engine, where the lower hose connects the bottom of the radiator to the water pump of the engine, which keeps coolant flowing through the system.
Keep your Mazda6's engine from overheating
High quality OEM Mazda Engine Coolant Hose
The engine coolant hose helps keep your engine from overheating by carrying coolant through the radiator and back through the engine