CAT 426B AC evaperator drain location

Hello, can anyone tell me where the AC evaporator drain hose exits the cab? I just charged the AC and now i'm getting a bath every time I make a turn or hit uneven ground. I imagine the hose is plugged and am thinking of blowing air up the hose to clear it then flush the evaporator coil with water to clean it and the pan out.
Any advice & suggestions will be greatly appreciated!

CAT 426B AC evaperator drain location