I wasw with OLDS for 24 years ..in most cases if this occurs you need to discharge sytem and put a 30 minute vacum on sytem and then recharge it and add about a 1/2 pound more of r34 then it reqires and recheck.......I never had to replace any blend door motors .....in most cases too the blend door motors require dash to be pulled ...................
bg
June 2008