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

1 answer
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!