These help with preventing air locks when filling but also you're supposed to run the car with the rad cap off, the heater on and set to hot, and the bleed funnel attached and when the thermostat opens it'll start burping the system
Thanks. I think I'll try the automatic bleed system, fuses and maybe heater control valve. Is it unlikely to be the thermostat if the gauge is working?
Just a thought, my Alfa only blows hot air from the windscreen vents, as the flaps behind the dash are knackered so it never gets routed to the dash vents no matter what you set the controls at. Maybe worth checking?
These help with preventing air locks when filling but also you're supposed to run the car with the rad cap off, the heater on and set to hot, and the bleed funnel attached and when the thermostat opens it'll start burping the system