Hitting a bump in the road affected the A/C

Rear didn't blow at all. Front AC blew really cold and I was okay with that. But I hit a bump yesterday and all the sudden the back AC started blowing. Not very cold but my front one wasn't blowing as cold either. That day. But next day the back on still blowing but neither one was blowing cold. So I checked the refrigerant and it was almost empty. I do residential AC work so I'm not a automotive expert but I believe there has to be some kind of solenoid or expansion valve controlling the refrigerant to the back evaporator coil which obviously is leaking. My question is this, how do I get it back to the way it was three days ago without trying to hit every pothole and bump I can? I've had the truck two years and I work out of it so I'm the only one that rides in it. I'm okay with the front one only. Can I just disconnect it at the rear control panel?

Found leak in rear evap. Strictly coincidence. I found there is no way to stop refrigerant from flowing to back evap other than block off adapters.