Hoses & Clamps
Because every engine exhibits a degree of torque-induced movement in the motor mounts, flexible connections are needed between the engine and the rigidly mounted parts of the cooling system: the radiator, heater core, and expansion tank. These flexible connections are the radiator and heater hoses. To avoid leaks and potential engine damage, these hoses should be inspected regularly and replaced at the manufacturer’s recommended interval.
The upper radiator hose conducts hot coolant from the engine to the radiator, where it is cooled, and the lower temperature liquid returns to the engine through the lower radiator hose. Heater hoses allow hot coolant to circulate through the heater core so the cabin can be warmed in winter, and the expansion/recovery tank hose allows coolant to flow back and forth the between the reservoir and radiator. Some engines may also have a thermostat bypass hose.