no matter what i put the setting on, the fan only runs through the defroster. heat, a/c, vent, all only blow at the windshield, not through the vent or heater(low).
Any ideas what's wrong?
The vacuum supply hose to your heater/AC control is not connected
All the (blend) doors inside the AC/heater housing operate off of vacuum motors/diaphragms, controlled by a rotary vacuum switch. If the vacuum supply is removed, it defaults to defrost.