Okay folks here we go , 1998 c5 corvette , has the independant controls for each pass. and pass side works as it is supposed to in all temp. but the drivers side only blows cold. did some background work and ended up buying a new unit for the dash , changed it out and alas no change so now have a spare for sale . if disconect the battery and let it sit for a while it will all work proper for a bite then goes funny again , tried the pulling of the fuse(cant remember which it was again)and it still didnt fix it , so what else is there to check/replace as the so called door will not allow hot air on the drivers side .