My mother has a 2004 Echo which she has bought new and driven around on a daily basis. Majority of simple maintenance (oil changes, filters, what not) is done by me. Just today, the alternator belt snapped off which caused her to lose aircon, a lit battery light, and most worryingly, the red coolant light. Being completely ignorant to cars, my mother decided to continue driving for around for about 10-15km with the light on before arriving home.
Obviously, driving around like that will eventually cause engine failure, but I would like to know if those 10-15km could have done any lasting damage. I started the car briefly when the engine was cold and could not hear or feel anything out of the ordinary.