2005 chevy 2500hd hvac problem
my trucks manual hvac system only blows on 5 but it blows hot air on driver side and cooler air on passenger side, when I set the control to 1,2,3 or 4 my abs light and brake light come on, I've changed the resistor, the hvac cluster itself, the plug that goes to the resistor. my hvac doesn't have rear defrost but the one I got from o'reillys is for with or without rear defrost so I have no idea what else it could be please let me know