WOW! So you want to do this yourself huh?
The car manufacturers and aftermarket system makers have published procedures regarding
the proper retrofit guidelines.
PICK UP A KIT FROM AUTO PARTS STORE< AND
They are something like this:
1. Remove ALL of the traces of R12 and its oil (internal dessicant bag
holds R12 residue and oil). Drain compressor, but do not put flush in it.
2. Flush ALL lines and components with a suitable flush.
3. Replace drier or accumulator
4. Install "locking"134A servicing valves
5. Replace all natural rubber orings with HBNR or neoprene, and ensure hoses
have "bubble" crimps, and barrier hose installed.
Refill components to factory specs with Polyolester (POE) or Polyalkyline Glycol (PAG)
oil, which are compatible with 134A refrigerants.
6. Install retrofit label containing type and amount of oil and refrigerant
7. Charge system to 80-90% of original R12 value. You are done!
My instructions are basic, but you should get the idea as to what is
required, and how detailed the procedure is to do it correctly. Unless ALL
of these steps are accomplished, your retrofit effort is a waste.
My suggestion to you is first find a shop that can safely remove the existing refrigerants
or blends from your car and store it in a compliant manner. If they have the type of
equipment to do this, it will cost you. Next, accomplish the above steps,or see your
local dealer for their specifications. Don't deviate from