Answer: Heater hoses can last from five to over ten years. However, it is very important to test periodically the condition of your heater hoses. Wait until your engine has a chance to cool and then feel your heater hoses. They should not feel too hard and brittle or too soft and mushy. If the hoses do feel too hard or too soft or appear to be cracked, you should have your heater hoses replaced as soon as possible. Also, if you are experiencing poor cabin heating or your engine overheats often, inspect your heater hoses and have them replaced if necessary.