It is not advisable use steam cleaners as vacuum cleaners. It depends on the model. Not all steam cleaners can vacuum. The role of a steam cleaner for couch is to disinfect and sanitize.
Because it liquefies the dirt, a steam cleaner does a decent job of vacuuming light dirt, but you must keep in mind that the machine will turn dirt into mud, so most of the time, it is hard to extract the dirt from the tank. In order to dispose of the dirty water, you want to keep the amount of solid waste to a minimum.
For the greatest results, start by using a vacuum cleaner and then use a steam cleaner.