S STEVE J New member Joined Aug 19, 2011 Messages 1 Reaction score 0 Points 0 Aug 19, 2011 #1 My 2003 Sierra has dual climate control it is now only blowing hot air no matter where the levers are set. Seems to go in and out. Is this the control unit or the heater core?
My 2003 Sierra has dual climate control it is now only blowing hot air no matter where the levers are set. Seems to go in and out. Is this the control unit or the heater core?
