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A/C Problems on 2000 Chevrolet Silverado 1500

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If I have Low pressure showing on the gauges what next?
(1) Answer
You need to add R-134 until the pressures are correct. The system is low. The low side gauge should be cycling around 40-45 psi and then down to about 25. it should go back and forth. This is on a 80 degree day.