Steering wheel is locked. How do i fix it? on 2001 Cadillac DeVille

First car was hot. we change the thermosta, water pump and radiator. Still ran hot. Now the Steerins wheel is locked. Cant jiggle it or turn the key. What can be wrong?

Asked by for the 2001 Cadillac DeVille
are your wheels locked tight rt or left?
Yeah they are.. The wheels wont move. They are facing forward but the steering wheel is turned to the right...