A/C and Heating not working? on 1992 Chevrolet S10 Blazer

i have a S10 Blazer 4.3. The problem i am having is ac and heat isnt working at all. when i mess around with the vent switch i do hear noises coming from behind the switch. But i dont have defrost or anything. Air and heat doesn't come from the vents what so ever. If someone can help me then i would appreciate the help!

Asked by for the 1992 Chevrolet S10 Blazer
2 answers
you either have a bad switch or a seiZed blower motor or a blower resistor
do you have defrost mode? if so you may have a vac leak to controller or poss blower motor issue