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Q: When checking ac what is the preasure high and low?
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Before you add freon to the ac do you need to check the pressure of the high and low side at the same time or one by one?

You will be checking the pressures at the same time......


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Hey C==You really need gauges to be sure you don't overcharge the system. The low preasure outlet is by the accumulator. You charge it through this port. GoodluckJOe


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The low side will be on the accumulator and the high side will be on the discharge line.....


Where is the most likely problem when there is no power to the ac compressor in a 1995 Pontiac Bonniville?

Try checking the low pressure switch.


How do you get the ac off low freon on 99 deville so your ac will work already been serviced and no leakes?

Check the low and high pressure switches, the AC fuse, and relay. Any of these can cause the AC to not get power to the clutch as if the freon is too low.


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