Why doesnt your high work on your blower for the air but low and in between does why?
Depending On What Vehicle You Have You Probable Have A Blown
Heater Motor Resistor. It Will Be Located In The Engine
Compartment, Near & In The Housing That The Fan Motor Is In. It
Should Have A 3 or 4 Wire Plug In It. Also 3-4 Small Screws Holding
It In. Also It Is Kinda Wierd Looking. This May Help.