THe hub turns very easily by hand (with engine off) & the belt tension is correct. History - The reason for the conversion was that the a/c had stopped working due to low Freon (aka the compressor would not engage) and the garage I normally go to no-longer stocks R12. They think I have a leak, but were unable to find it with a UV light. (I had the system charged two years ago and UV dye was added.) I decided to go to R134 because around here, the cost of R12 (if you can find it) has gone through the roof!

Thanks for the reply!