The low pressure (vacuum) side.
your freon is measured with gauges hooked up to low side of air condition unit the low side is the cold side high side is the condenser side WATCHOUT high pressure every unit has atag on it and let you know how many ounces to be put in low charge is bad but over charge is also bad
The low side has a bigger fitting then the hide side
The low side of an AC system begins at the metering device outlet and ends at the compressor inlet.
By buying an AC charge hose and a can or 2 of R134a freon (depending on how much your car needs) Attach hose to the low pressure side & charge system. Do not overcharge, or you may destroy the AC system.
300psi high side and 80psi low side
Yes, through the schrader valve.
The low side.
The AC low side service ports for a 99 Oldsmobile Aurora are located on the AC unit. This unit is located between the engine block and the back firewall of the vehicle under the hood. The service port is typically the largest port on the back of the AC unit.
The same as you would with a single a/c system, charged on the low side service port. If you connect a small can of Freon to the high side with the system on, the can may explode from the high pressure introduced into it.....
On the low pressure side which is close to the accumulator by the firewall.
The low pressure side of the ac system is the ac hose that runs from the inside of the vehicle to the ac compressor. The high pressure side runs from the ac compressor to the condensor in front of the radiator. Follow the ac hose from the compressor back to the body and you will find the charge fitting. It is smaller in diameter than the high pressure side. You would need a different adapter to hook up to the high side.