May have fixed it well the thermo opened when I put it in hot water and closed when In cold so thought it was ok looks like it wasn't as I'm now rocking with out a thermostat and the pipes get a bit hard but no where near as hard as before and the bottom hose now gets warm and no more BUBBLES so going to get a td thermo and pop that one in only thing now is its trying to use cold start as it has no thermo but I can live with that for a few days