Hi. We recently moved into an older house (built 1901) that has a mix of cast iron radiators and convectors. We are noticing that the farthest radiator on the 2nd floor from the boiler gets hot, but the room will become cooler than the rest of the rooms upstairs overnight. Also, the convector in the bathroom next to that room does not seem to be working (the pipe does not feel hot to the touch). In another forum, it was suggested we start with the ensuring we have enough venting on the mains. I have attached some pictures of the main vent (we only see one) and the boiler as well as the pressure gauge. Should we put in a bigger vent or add a vent somewhere?