On my trusted 84 300SD my defroster vents decided to crap out on me. Seems they are stuck closed (which makes no sense) When the actualtors fail, dont they release? Perhaps other vents are stuck open.
Flaps open, flaps closed - makes my head spin.
Is there a good web source manuall to help me trouble shoot. I suspect most of these actuator valves cannot be reached without tearing out the dash.