Hey I own a 1991 firebird formula and I am new to the this but I figured that I should get involved. My ac works on everything but the high setting and I can't figure out why. I know it may be an easy fix but I know nothing about ac and how it works. Any help would be greatly appreciated. Thanks.

 

if you mean the blower stops when switched to high
speed,could have a bad high speed relay-lower speeds
go through resistors,but for max speed a relay is used
could be a bad connection too.