This has a lot to do with the ambient temperature and humidity. but a ball park figure outside temp 90 degrees F. and low humidity could be High side pressure 180 - 225 PSI and low side pressure 30-50 PSI. at idle speed with a/c on high
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.
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The low pressure connection for your 1993 Jeep Cherokee air conditioning system is located on the top of the air conditioning compressor. There is a low pressure connection and a high pressure connection, both should be labeled.
When looking for a brand new fresh from the manufacturer rooftop Air Conditioning/Heating unit you should look for reviews from the manufacturer and the people that purchase them.
the purge unit exhaust port
The low pressure valve, on your 1995, Mercury, is located on the top of the air conditioning compressor. The low pressure valve should be labeled.
If it works properly, never.
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Without knowledge of the pressure in the air cond. lab. unit you will not be able to calculate the mass flow. Without the mass flow you cannot do any analysis of the system.
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Low pressure side of compressor (larger hose)
If is a 2 stage air conditioning unit. You might want to replace the furnace.