I have a 98 bravada every time I turn the heater on it makes a really loud sound, almost like a growling noise, does any one know what it could be?? The heat still works good but the AC doesn't work does anyone know what the problem could be?? Also when I'm driving on the freeway even if the heats off it feels like it's on does anyone know what Could be causing this??

 

I would almost have to hear it but it could be your fan. When they go up they make weird noise.

 

Thanks it's the blower motor, and the ac clutch is grinding, does anyone know the part number for the ac clutch(Delphi)plate tool remover I bought one from advance auto but it does not work the thanks