[DeltaP]

You'll have to bleed out the cooling system just like in any cooling system repair. Put a large pan under the radiator, turn heater to full hot. Refill the radiator to just above the core, run engine until temp comes up and let it bubble out. When ya stop seeing bubbles shut it off and let it cool then refill to proper level. I use the "Lisle No Spill Funnel" from Napa... $20-25 bucks. You won't need the pan under the radiator.