If the Thermostate is right... you should have NEVER Problems with to bleed the coolantsystem... heater "HIGH" and wait until the wathertemperatur is at 90-95°C on the heatindicator, then you should hold the enginespeed at 4000-5000rpm...
or you drive a round like normaly (2-3000rpm) and when it is on operating temperatur - give it to him
