so my AC and heater work .. the blower has just the high setting, which i’m working on..however i wanted to see if anyone has seen this or know how to fix it ..
first it’s a 92 firebird 305 TBI, all original .. as far as i know .. the previous owner did a really bad electrical hack job to bypass the starter so he had a cool looking button.. so this may or may not have something to do with that ..
so fan at low and switches all the way to the left, cold and off, there is no noise at all.. move the cool/heat lever a small micro bit and you get a loud swishing or blowing noise .. no air coming out of anything .. just a constant noise except when i mash the gas for some reason... from half a smidge from cold all the way to the end of hot it makes the noise..

i ok found out this was a vacuum leak.. in tweaking it but she seems to be working !