8
850Rick
Yeah rick don't want to mess the custards carpet up. Iv had an airlock on a sealed microbore system before i just filled the system up to under three bar that sorted it! Then drained down back to 1.5 when all the rads where hot. If a open vented rick you could blow down the vent use a wetvac to blow down the vent open the bleed tapping on a rad and open the valves.
3 bar frigging hell lol Thats guaranteed to getting the water going round lol