Using a set of a/c gauges put the
blue hose on the low side (suction side) and the red hose on the
high side (discharge side) and make sure that there is no freon in
the system and if you have freon in the system then you will have
to go to an automotive a/c shop and have them reclaim it for
you..
Put the yellow hose on your vacuum
pump and let it run for about 1 hour and then let it sit for 1 hour
so that you can see if it will at least hold the vacuum pulled.
If so then let it run for an
additional hour and then start the recharging process remembering
to keep the low side readings between 30 to 40psi and the high side
between 200 to 250psi depending on the outside
temperature…………….
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