what does it mean when I turn the defroster all the way on , and it makes a clicking and rattling noise in a 2004 chevy cavalier?
Blend/mood door actuator is bad or door is broken.
www.youtube.com/watch?v=uuMGDnRbt70--- check this out Will also work for a Chevy Cavalier from my understanding. ... Chevy Blend Door Actuator ...
Bad blower motor or loose squirrel cage (fan) maybe. HTH. -Jim