Originally Posted by derburger

The work isn't hard, it's removing the A/C parts, pouring flush through hoses (use an empty dish soap bottle to pour A/C flush solvent) and blowing them out with compressed air many times, you need a SAE (The A/C fittings are all standard) flarenut wrench for the expansion valve(remove pass side kick panel & glove box to reach) nuts since they are brass and want to strip, NAPA sells this wrench.

If your wagon is still r12 I highly recommend keeping r12, or deconverting back to r12 if it's r-134a. I went back to 12 from r-134a, best thing I've done to my car. To buy R12 you can take an online quiz from ASE for $15, then buy cans of it off ebay.