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do you think I should have pulled a vacuum with the high pressure being only 25 at start?
It is always advised to recover remaining freon, and then vacuum before putting new freon....
could this be the reason that the high is not going up very well?
And if you have the equipment....it is better to fill the correct amount (weight), as opposed to measuring the pressures.....so the pressure test would be to confirm.....
Yes, it could be.....
should i have also added an oil charge?
not necessary....unless the system was leaking.......
it must have been leaking since the pressures were so low, and it was blowing warm air
was the compressor running?
it started running after I started adding freon. Still though after 15 or 20 minutes, it wouldn't stay running
i assume it's because the pressures are too low
ok......so it was a "good" leak, and adding oil in this case is advised.
how many oz charge?
yes of course.....if the leak is small, then the pressure would be high enough to run the compressor, as for the oil, you should,
should I add a 2 oz charge or more?
50 cc of oil would put you on the safe side....
around 2 oz
when the system is vacuumed, it would quickly take the needed amount of oil and freon.....