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Originally Posted by west50
I'm wanting to charge the air in my truck. I have the manifold gauges and a 30lb. cylinder of 134a. what I can't remember is where the low and high side pressures should be on these gauges. i'm thinking high side 150-200 and low side 30-40 is this correct. haven't had to charge one in awhile
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Use a scale and charge the quantity listed on the MFG label affixed under the hood. Ususlly around 2lbs. The low pressure side will generally read around 35 - 55 psi when fully charged and under load. The high side will be anywhere below 250 psi. Remember all pressures vary dramatically dependant on ambient conditions and system loading.