Hi. I had an engine swap recently. I went with the lowest price for the install and now I find myself trouble shooting everything he either broke or didn't reconnect. Anyway, since its starting to get cool in the mornings, I notice the heat on the passenger side blows cold air. When I first start my commute, everything is normal, but then about 20 minutes in, the passenger side starts blowing cold air. I'm wondering what position is the heater control valve supposed to be in. Right now, I'd looking at it from the passenger side front tire, The control arm is to the right or toward the front of the car. if you pull off the small vacuum line that attaches, there is no vacuum that I can feel. My question is should that vacuum be strong that I can feel it on my finger or is there really no vacuum? The other is what position should that valve be in if inn calling for heat. Should the pressure of the coolant be enough to push it to the other position? It seems like that little arm should move. Any insight will help. Thanks.