03 Tiburon a/c issues
 

Good day, I have a 2003 Tiburon w/ 2.0 engine & automatic trans. The air conditioning works when the a/c button is on and the blower speed is on "1". When I try to go to 2 - 4 ,the a/c button turns off and blows out warm. Any ideas what it could be & how i can fix that?
Thanks,
JT