A customer came into the shop with their temperature warning light on with their car over heating and in a panic.  After it cooled down, we discovered the water pump was leaking and needed to be replaced.  Water pumps do wear out as they pump the coolant that cools the engine while its running.   We also checked the radiator hoses, serpentine belt, and tensioner which were okay, but did note that the coolant needed to be changed which many customers do not associate with engine maintenance.   

My customers have been asking for more information on synthetic oil and how it affects their engine.  Basically the inside of your engine gets really hot because of friction from the moving parts and from burning fuel. Oil lubricates the moving parts to keep them from getting too hot.