Auto Systems and Repair
Heater Hose Replacement
Heater hoses provide a flexible connection between the engine cooling system and the heater core. The heater hoses are made of rubber and will wear as they age.
Since they're likely the same age and in similar condition as the hose being replaced, you might want to consider replacing the heater hoses when any coolant hose is replaced.
During replacement of the heater hoses, the heater control valve should also be replaced (if equipped).