Despite the noise & vibration (especially if the brackets aren't all secure) and power usage, the York generaly has a much better reputation for durability than the R4. There used to be different sized compressor-pulleys availible for the York. If that's still the case, some may want to consider fitting a larger diameter pulley. Many years ago, I did this with a hang-on Sears AC in a '67 Mustang, and while there was some loss of AC cooling at idle, there was a significant overall reduction in engine temperature and load.

Happy Motoring, Mark

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DrDKW