Auto Systems and Repair
Lower Radiator Hose Replacement
An engine has two radiator hoses: lower and upper. The lower hose brings coolant (a mixture of water and antifreeze) that has been cooled in the radiator to the engine, where it circulates and absorbs heat. The upper hose carries hot coolant from the engine back to the radiator to be recooled. The radiator hoses are located between the radiator and the engine block.
Radiator hoses are made from rubber so they deteriorate over time. Periodically check for cracks, damage, swelling, or contamination due to oil leaks.
To replace a radiator hose, the cooling system is drained. The clamps securing the radiator hose are removed, and the hose is replaced. The radiator is filled with coolant, air is removed from the system, and the engine is started and brought to normal operating temperature.