skoda oct 2003 car a/c suddenly started blowing hotair.2fans stop working?

5 days back,car a/c suddenly started blowing hotair. They checked it said there's has leak from ac line,fixed it.2wk later again same problem-hot air,not cooling at all.fuses got burned.i replaced and saw the fans working.
The next day again the same problem.They said both fans stoped working.on second opnion, another guy said gasket.
With the knowledge i had,i think the coolant will have oil mixed in that case.
What could be the reason.pl help.