Water pump blocked by AC compressor

You might want to go to a R-134 conversion and DIY. The kits are inexpensive. I bought a air operated vacuum pump from harbor freight that works like a charm for about 15 bucks.All you need is a air compressor and a R-134 charging hose. While its already discharged you can replace all the o rings and schrader valves for mere pennies. Remember to only use 80% of the original coolant charge when switching to R-134. If you have more questions I'll be happy to help.