The air conditioner/heating system doesn't seem to be the problem. I can just barely feel hot/cold air coming from the vents. But, the fan doesn't propel the air into the car. Sometimes, after having started the car and driven it for ~10 mintues, it will begin to work a bit, but only if the air is on full blast. Any thoughts on what may be the cause of the problem, and how much a repair should cost? Thanks for the help.