How do you bleed the cooling system?

No mater how I try I always hear air/water in the heater matrix

I opened all the water pipes and flushed all water and then i buting my vacuumcleaner to blowing mode and flushing all the antifreez out, but all pipes again back and new antifreezer in ?

didnt you order fiat coolant bleeding brochure? its only 4,99, limited edition

Buy some earplugs
Punto is tricky mainly because it doesn't have a proper header tank and the heater hose bleeder is too low. Try filling the rad filler neck to the top before opening the back bleeder. To help it along I fill a drinks bottle with coolant and upend it on the filler neck and squeeze hard, until the bubbles stop coming out the back bleeder. Then drop the excess from the bleeder on the rad.

For the 1.2 8v do as follows.

turn the cabin heater to hot, open the bleed screw on the rad and the bleed screw behind the engine. Poor coolant into expansion tank until it comes out the bleed screws then close the bleed screws. Fill expansion tank to the top and start engine. Open one bleed screw until there are no bubbles then close it. Repeat with other bleed screw. Keep the expansion tank full to the top whilst doing this.

once all air is out shut down the engine and draw out the excess coolant from the expansion tank to the max mark. Close tank and start engine. Run the engine until the cooling fan kicks in then shut down engine. Allow engine to cool fully then recheck coolant level in expansion tank and adjust as needed.

Thanks for the tips