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Never. A properly operating AC unit will have no leaks, thus never need recharging.
The low pressure air conditioner port can be found on the top of the air conditioner compressor. The low pressure port should be labeled as such.
The pressure for an R410a air conditioner system should be 118psi LP and 412psi HP. This is the same pressure as an R22 air conditioner.
70-85/ 350/290
That depends on a number of things including: how hot is it outside, inside, is it functioning properly, is it sized properly?
Recharging should be on low-pressure side only
upgrade
Evaporator temp should be 15 Degrees. Gauge pressure should be around 15psig
Depends on power factor, but it should be about 8 Amps.
Clean install.
The 2004 Chevrolet Impala air conditioning pressure switch can be found on the end of the air conditioner compressor. The pressure switch should be labeled as such.
If you are referring to the sight glass, the liquid beneath the glass should flow clear without bubbles when properly charged with refrigerant.