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How long to leave vacuum pump running for an automotive A/C job?
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<blockquote data-quote="918evo" data-source="post: 3737099" data-attributes="member: 6001"><p>More important than the time is the amount of vacuum pulled. I would want to see close to 30 in and typically pull 20 min and let it set 30 min or so. Every system holds a slightly different amount of PAG and different weights, so just use your judgment or look it up. On a 4 oz system, after replacing a hose and compressor, assuming the new compressor came without oil, I would put 1.5 to 2 oz in and call it good.</p></blockquote><p></p>
[QUOTE="918evo, post: 3737099, member: 6001"] More important than the time is the amount of vacuum pulled. I would want to see close to 30 in and typically pull 20 min and let it set 30 min or so. Every system holds a slightly different amount of PAG and different weights, so just use your judgment or look it up. On a 4 oz system, after replacing a hose and compressor, assuming the new compressor came without oil, I would put 1.5 to 2 oz in and call it good. [/QUOTE]
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