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The good news is that my AC is finally working again after charging with ES-12a. However, I now have to run it all the time because the compressor clutch isn't fully disengaging when the AC is off, making a nasty scraping noise.
A bit of history. System had a slow leak, and had zero pressure for a couple of years. Empty. Preparing my AC system for ES-12a, I pulled the compressor to drain the oil. No oil came out, dry. Spinning the pulley, I heard a scraping noise. Hmm, maybe the clutch bearings are bad. So I pulled off the compressor clutch. Well, bearings were OK, so I cleaned everything and put it back together. Used a torque wrench on the end bolt to spec. No extra parts. All the shims back in place.
Before I removed the compressor, there were no noises from the compressor. But as soon as I removed it (no disassembly), the clutch was rubbing the pulley when I spinned it.
Watching the compressor with the engine running, and the ac off, I see the compressor rotating at a lower speed than the pulley (i.e., periodically catching), and making the "nasty scraping noise."
Any ideas? Maybe I need some more shims? It is great having AC again, but not all the time!
A bit of history. System had a slow leak, and had zero pressure for a couple of years. Empty. Preparing my AC system for ES-12a, I pulled the compressor to drain the oil. No oil came out, dry. Spinning the pulley, I heard a scraping noise. Hmm, maybe the clutch bearings are bad. So I pulled off the compressor clutch. Well, bearings were OK, so I cleaned everything and put it back together. Used a torque wrench on the end bolt to spec. No extra parts. All the shims back in place.
Before I removed the compressor, there were no noises from the compressor. But as soon as I removed it (no disassembly), the clutch was rubbing the pulley when I spinned it.
Watching the compressor with the engine running, and the ac off, I see the compressor rotating at a lower speed than the pulley (i.e., periodically catching), and making the "nasty scraping noise."
Any ideas? Maybe I need some more shims? It is great having AC again, but not all the time!