My vacuum cleaner sucks the dirt up but blows it out the back , I put
Why my vacuum cleaner blows dirt out the back after it sucks the dirt up
As stated in the comments, would be helpful to know the make, model or type of vacuum cleaner. One that uses a disposable bag or one that has a see through canister that you empty out when full. Also when did this problem start, after a dirt disposal operation, bag or filter change or change of attachment, pipe, nozzle etc.? More information needed.