which/where is the air vent vacuum hose

[whatthecrappin]

Had the car converted to gas and I have a feeling that it must of backfired and popped the vacuum hose off for the air vent selector. Could someone point me to a diagram or where its located?
maybe a workshop manual?

[whatthecrappin]

shouldve known better that the vacuum hose was only 5mm in diameter. Was actually moving it out the way looking at bigger hoses..........

oh well - all good now!