where does vacuum hose for heater vent control connect to engine

Look around, it was one there once upon a time! Do you see any labels at all? Look again! Looks like a bunch of black lines on a white label, or vice versa. Which engine? 4 or 6 cyl.? And do you see the hose at all? You ask where it connects to the eng. so do you see the hose? Repair shop is where you need yo go.