Hey everyone, I just registered my wife here but I'm putting up her first post:great:She has a 1995 suburban and the heater fan blows on high all the time. Is this a blower fan switch or something? Maybe the climate control unit? I'd like to fix it asap. She dives the truck daily and I don't get too much time to work on it so a little direction to narrow down the search would be great! Thanks.