First, the vacuum always blows out air. Second, change the belt and test it again. Third, check to make sure the paper bag is not sandwiched in between the bag housing and the bag cover. Fourth make sure the hose is pushed all the way in the lower hose area. If none of these things fixes it, I've heard Dyson makes an awesome vacuum... Good luck matey!
www.bobsroswellvacuum.com, October 2008