I went to walmart tonight and bout the little kit for 134a.
It contained some couplers of different sizes, 3 cans of r134a a valve
and a hose.
I put the right coupler on the cold side connector of the air
conditioning in the
engine compartment.  Puncturing the r134 can isn't easy.  Once you
start
you must push very hard and twist the can on.  Then the valve is made
from
plastic and the threads stripped.  I got one can in the air
conditioning.
I had to go to an auto zone and get a metal valve and hose.  These
didn't strip the
threads but it was very hard to puncture the R134a can and get it
threaded onto the
valve.  I put it on the ground and pushed and got it on without loosing
all the gas.
Once I got three cans in the airconditioning it started working real
well.  I'll have to
wait and see how long it keeps cooling this summer.
Oh, the kit was $33.00 and the other good valve and hose was $13.00.