Replaced radiator and now no heat

I had my radiator replaced yesterday, Saturday and the heat doesn’t blow through my vents anymore. I had the thermostat replaced last month. The heat was blowing through all vents except the two front passenger vents. Now after replacing my radiator they don’t blow heat anymore. The one on the front drive side next to the window will blow some heat sometimes but not for long and not as hot. ‘14 320i xDrive. Thanks in advance.