a/c issues
 

the a/c on my 05 mazda 3 it will work when it wants to, it will work some times with it in fan position 2 and 3 then some after a while the ac light goes out turn it off click the button a few times and back to 2 or 3 and it will work fine for a little while longer depending on hot hot or cold is it, but it wont work on position 1 or somtimes 4 so would the switch be bad or is there not enough oil/refrigerant in the sytem?