I would start there. If it is not cooling well, but it is moving the
air, more likely you need to have it charged. With it being a 99, it
should be a R134a system, which you can buy a can of with a hose and
pressure gauge at any auto parts store or Wal-mart for under 20
bucks. It is real easy to do, just find your low pressure fitting and
follow the instructions.
This is not always the best advice. If the compressor is cycling fast then
there is a chance that the refrigerant is low but if it isn't, he could make
it work even worse by overcharging and could get himself hurt. It could be
the blend-air door is sticking part way open and is adding warm air to the
mix or it could be that it is just a very warm day and his memory is
slipping on how cold he thought that it was. It could also be that the
evaporator or even the condenser is dirty and needs to be cleaned. There
are many things besides the charge that can cause this and the easiest thing
to do to check is monitor how fast the compressor cycles.
If at first you don't succeed, you're not cut out for skydiving
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