My Dyson DC05 seem to be sucking in, In the wrong place?

Hi Stephen.

Yes your machine has a blockage somewhere the spring & vent are part of the safety valve which open to allow air to pass over the motor when there is a blockage. It will allso do this if you cover the suction end of pie with your hand.
Find the blockade or you will burn the motor out.

nat
October 2006