Lower radiator hose not hot after coolant flush.

[mbzjag8090]

Hi, I drained my coolant and replaced the heater core. I filled with coolant today but I think there is an air pocket. The lower radiator hose is cold and the hoses going to the heater core are also cold and I have no heat. The temp. needle will not stop climbing. What do you recommend I do to get the air pocket out? Maybe let it cool off entirely and then give it some gas? If that is what you think the problem is...