2002 Ranger 2.3. A while back I had a local shop replace a heater hose that was leaking. I didn’t notice till recently my blower will only blow air from the defrost vents (which I understand is a default mode?). According to forums here it is likely caused by a vacumn leak? I noticed there is so,e kind of vacumn device attached to the heater hose that was replaced, coincidence or could that be the vacumn problem? Any advice appreciated!