I'd like to know the answer to this as well. My A/C works, but heater does not. The Climate control will direct the air out the dash but will not change it to the floor or to both the floor and dash. Defrost works but automatically makes the air go on full blast (is this supposed to happen?) Cant tell if the circulate the inside air button works but I dont think it does. Is vacume the cause of my problems or is it a fault Control Unit.

Hassman, I will be following this tread and hoping someone with experience steps up to give us the answer.

SKI