it is a straight forward job. a Bentley manual will help somwhat. Remember
you will have to discharge the system first, also remember to have a
vacumm pulled on the system as soon as possible, moisture is the killer of
any A/C system. You will have to drop the rear A/C unit to get to the
valve. The dryer is located in the Driver's front wheel well. Two good
adjusted wrenches are needed, or even better a good set of wrenches. Take
your time a be patient it is more labor than skill. Do not stip the
connections. It is a good idea to look over the rear a/c unit, for trash
and clean the coil while you are there. Something to think about
though,how high is high on his readings. 134a runs higher and is only
about 80% efficent as r-12. Did he flush and clean , and change the o-
rings and oil in the system? If not ....you prob. don't need the change
these parts......my 2 cents...hope it helps