you've got an air lock in your rad hoses. the best way to remove the air lock is to jack the front end of the car up insanly high. I usually get 2 car jacks and jack them both up really high for my buick lucerne.
then you need to massage the rad hoses obviously when cold. squeeze them in all the way.
Once you've done this for a while, get the car back down on the ground and open the radiator over flow tank up, get the car red hot and see if you have heat in the car as well as the liquid is happily flowing in the tank.