It will always be on the larger of the two hoses, near the compressor and will have a plastic cap on it with the letter L
It is difficult to determine the different pressure ports on your air conditioning compressor without knowing the make and model of the automobile. In most cases the low pressure port is on the right hand side of the air conditioner compressor.
low pressure side is located closest to the front of the vehicle on the right side as you are facing the engine it shoulh have a screw on cap with the letter L for low pressure.
it is the low pressure side
The low pressure side of an air conditioner compressor is easy to locate - it is the side with the larger pipe. Follow the low pressure pipe back and you will find the gas nipple where fresh gas is added to the system.
Recharging should be on low-pressure side only
relieve the pressure off the high pressure side
Yes
On an automobile air conditioning system, the low side is the larger hose. The low side consists of 1 side of the air conditioner compressor, the accumulator or receiver drier, and the evaporator. The high side is the other side of the compressor, the condenser, the orfice or expansion valve and in some cases it may have a muffler near the compressor.
The high side will not hook up to the hose
The low pressure valve is on the side of the accumulator-drier bottle. It is on the passenger side of the firewall.
maybe overcharged, or return air leaks (the hotter the return air the more the low side pressure)
The recharge valve for the air conditioner on a 2002 GMC Envoy can be found by looking at the rear of the engine compartment. It will have a cap over the valve labelled as low pressure side.