i had my AC compressor replaced, the blower wasn't kicking in when turned on the AC, so they replaced the pressure switch, still not working,, replaced the relay and then it started working, getting down to 45'. but now it seems sometimes it blows cold air and sometimes it don't. any help/suggestions/clues will be greatly appreciated.
my guess is it might be something electrical something not grounded or shorting out.

 

A/C repair is one of the biggest scams in the automotive industry
If the fan is not blowing at all speeds it could be several things. relay , fuse , switch
did they pump out the a/c system? Did you replace the complete system ?air dryer , orfice tube
if not you could have a blockage in the line