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I did one R134A conversion and was not happy with the results. My recommendation is to keep R12 in it, as long as you can get it. It will be more expensive than R134A, but it will perform better. Is that why your estimate is so high? Is it for an R134A conversion? Maybe that's why the hoses are included. If it is a conversion, then the freon cost is really high. If it were me, I'd fix the problem and keep R12 in it.
Paul
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