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the low side and high side pressures will vary as the outside temp and humidity change. the low side should be some were from 30 to 45 psi and the high should be 140 to 225 psi. now these are just ball park figures and as I don't know what the ambient temp is, the lower the temps the lower the pressures
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30 years GM tech
20 years GM master tech
04 Yellow
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