Will zaxis 25
Hello all, any wizards out there? I'm trying stop my zx25 overheating. The manual for it doesn't mention the cooling system.I've put a new thermostat in, the rads are clear, I've flushed the system. Nothing has stopped it from overheating after about 10mins of work. I'm wondering if there is air in the system. I've attached a photo with an arrow pointing to a possible bleed point. Does anybody know what this is? It has ptfe tape in the threads. The big pipe next to it seems to go to the radiator but doesn't seem to get water in it. Any help much appreciated.