I've got a 1999 9-5 wagon, with automatic climate control. Bought the car used and am going through trying to get everything in working order. I noticed that there was very mediocre heat in the car, if any. Ran the ACC calibration and came up with Code 8 and code 21. Opened up the dash panel in the driver's footwell and determined the stop arm was broken on the driver's side blend door shaft. From everything I can see the rest of the shaft is fine, I can see some of it with the foot duct removed. I replaced the stop arm and put the motor back in place last night. Ran the ACC calibration and heard kind of a creaky noise coming from the blend door motor location, but only the Code 21 showed, still no heat. At that point I removed the blend door motor again, started the car, and manually moved the blend door arm/shaft. I watched the green flap inside move while I turned the arm, leading me to believe the shaft is fine inside the heater box. Still no heat, with the arm turned manually all the way to either stop. I haven't looked into the Code 21 yet, but as far as I have read or searched that refers to a recirculation door motor problem, which shouldn't be affecting my heat this much as far as I can tell. Is it possible that the coolant bypass valve is bad, maybe heater core clogged, possibly an air bubble in the heater core? I know my way around a car, I just don't know Saabs at all and the time I have been able to spend on this thing is limited. Appreciate any and all insight you might have.
I guess in summary, I am confused about what flap/door/motors control the change from hot to cold air. As far as I understood there's one on each side due to the dual zone climate control, so the lack of heat on either side makes me think it's something affecting both side.