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Maybe you only need half a pound of R12 to trip the low pressure switch? If that's the case I would have them top it off and go another year. THere are very few systems that are 100% leakproof at those pressures over long period of time. IF it's completely empty you probably have a big leak and it would be reasonable to update to r134. I got my R12 license for $25 several years ago on the internet. Last year R12 was $20-25/can I guess I shouldn't talk much since I removed the compressor from my spg.
dave
posted by 68.10.24...
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