2003 Honda cr-v

If there is a bleeder, it will be on the thermostat housing. If there isn't, loosten the return line from the heater core to release any trapped air. Do this first, start the engine, with the heater on high, let the engine warm up. Check to see of both heater core hoses are hot. If they are, you have circulation through the heater core. If only one is hot, then you have a plugged core or an air block. If they are hot, check the blend door. It is located near the heater core. It determines if you get heat or AC into the vehicle.