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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.
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 psi to 250 psi depending on the outside temperature and also remember to add refrigeration oil as well.
The quoted numbers are typical of R134a refrigeration systems. Other refrigerant formulations will produce different high and low side pressure readings for the same cooling effect.
The purpose of vacuuming out the system is twofold:
- Air makes a lousy refrigerant, so you don't want it in the system.
- The water vapor and oxygen in air promote corrosion of metals in the system.
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