This applies to the newer r134a refrigerant systems as well as the older r12 systems.
Vacuum air conditioning car.
Vacuums are used to evacuate acs a process by which they pull out all air and moisture from the refrigerant system prior to testing repairs and recharging.
Proper way to pull a vacuum from a discharged auto ac system.
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Pulling a vacuum is a common part of air conditioning repairs.
When concerned as to how long to vacuum car ac system you should know that it would take around 30 45 minutes.
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Moisture in the ac system is a serious problem because moisture reduces the performance of the ac system and condensation of water can cause the ac system to freeze.
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When an air conditioning system loses its ability to cool properly it may be necessary to recharge the system with new refrigerant keep reading for a r 134a a c pressure chart and steps on how to recharge the a c system when the system is low on pressure or has been vacuumed out following a repair.
For effective vacuuming open the low port s valve of the gauge.