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?
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?