Ac problems

I got the ac vacuum and he said it wasn't any leaks
and the ac is holding charge and he requested that
I look under the dashboard at the very bottom and
make sure the door to open and close the leverage
that controls the temperature and make sure it is in
the right place and I got that checked and it wasn't
the problem and he also requested that I get a new
expansion valve and change the ac sensor and I
did and recharge the ac again and I did and it's still
blowing warm air