bonkers

My heater never blew out warm/hot air and now the blower has packed up!! Does anybody know what it may be?? Apparently only half a volt is going through heater but fuse is OK. Yes I'm a female so know nothing about cars except that the children and I wrap up to go in the car as we have to have windows open or we steam up!! Somebody pls help us!! Diagram of heating matrix would be usefull as I've been told it could be that. Thanks in advance. Oh, I understand the weather's going to get colder next day or two!!! :rolleyes: