Have you sorted your vacuum issue?
If not, first place to check is for the heater/ventilation flap actuators, one quick check is, with the engine running, to cycle the ventilation from screen to fresh air to recirc and see if you can hear the flaps cycling.then cycle it to fresh air and the inlet flap under the bonnet should open, then stay open when you turn off the engine.
Then check the hoses are connected as these can fall off. This bit can be a pain as they are located behind the centre console.
Hope this helps,
Ged