I'm mew to the mini truck world. Working through systems on my S83P and there is no heat. I ready that it only comes out of the window vents and floor but nothing there either. After some digging into the coolant system, found that it was low on fluid. Filled it and found a leak at the top of the motor on the fitting in the photo attached. Is this the heater matrix supply? If not, can anyone tell me where to find the heater matrix hoses?