heater problem wont come on. on 1991 Buick Park Avenue

we have put new fuses in, wanted to check other things first if possible before putting in shop.can anyone help

Asked by for the 1991 Buick Park Avenue
this just happend in my 96 park ave. My boyfriend changed the blower motor, which we got a used one from the junk yard for $15 and it took him like an hour to do. heater works better than ever now!