The shaft for the air blend door can fail creating the inability to adjust the AC or heating temperature. The AC or Heat will not maintain the proper temperature.
Car Problem Reports
Saab 9-3 Inability to Maintain or Control AC or Heating Temperature
Saab 9-3 Problem
Average Mileage: 57,193 mi (11,665 mi - 110,000 mi)
The driver's side vent will blow cold, but the passenger side will blow slightly warm. Not going to fix as the entire dashboard has to be removed to get to the little rod that failed. For me, it's a problem to be endured rather than fixed.
Visitor, 2003 Saab 9-3, 61,000 mi
still trying to determine the solution
Visitor, 2005 Saab 9-3, 110,000 mi
The vents will not blow hot air at all even with the climate control knobed turned to high heat. Just before the issue happend a clicking sound could be heard when adjusting the cc knob from cold to heat.
Visitor, 2007 Saab 9-3, 31,300 mi
Cold air only comes out of the driver side vent. Dealer said probably faulty or failed blend door mechanism. Glad I have a warranty to cover the labor of getting in there and replacing the part