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The pressure of the refrigerant in the systems vary depending on the temperature of the refrigerant gas and the type of gas used. So this is a question that can't be answered without a lot of additional information.
Rathish, You are asking a very vague question. I will attempt to help you but I will have to assume a few things. Like: This is a residential frig, that uses R134a refrigerant, and the compressor is no larger that 1/4 H.P. In this case what you are looking for is ABOUT 3 to 7 PSI on the LOW side or the suction side. High side could be 160 to 210 depending on many factors. Be careful!
The low side port of the 2005 GMC savanna Van is located on the low pressure side of the compressor.
This is found by locating the compressor driven by a belt that has a clutch that engages and disengages as the a/c cycles.
The low pressure piping is always in the larger diameter piping, and the high pressure side is always contained in the smaller diameter piping.
Therefore, follow the thick pipes from the compressor up to the accumulator, which looks like a large can of soup. On the accumulator receiver/drier is a port that connects to the tube that is connected to the can of r134a freon refrigerant.
Simply quick connect the tube to the low side port, which is located on the 'thick' tubing or on the accumulator and then fill until the low side pressure is 25 psi to 45 psi while the compressor is running.
When the car is off and the compressor is not running, the pressure should be 75 psi to 100 psi on a hot day.
Hopefully the system doesn't have a leak slow or fast in it.
R134A, system low side should be at 28-32 PSI when compressor is running, it should kick off at about that pressure and then re-engage at 38-42 PSI, high side depends on the outside temp and humidity..
The stop leak probably stopped up your cap tube system and the filter drier.You can try by replacing the filter drier, vacuum the system to 500 microns and recharge.The automotive 134a is the same as any other 134a.