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Q: 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!
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