95 4cyl 5spd probe

had air con.. on other day n all was well...daughter (her car) had defrost on next morning...and now vent system seems stuck on defrost...looked quick fer vacuem lines dint see anythin...are these operated by vacuem? and any easy fix etc to make operate defrost vent floor again...thanks paps

sarry took so long...but yes they r vacuem operated n yes my prolem wid doors nawt directin air to propor vent floor etc was a bad vac line paps