You will be checking the pressures at the same time......
You will definitely lose all of your Freon when you replace the high pressure switch. Once the high pressure switch is loosen the Freon will begin to access the system.
Freon is added through the low side ac port. A gauge is recommended to check the Freon pressure, as too low or too high pressure can cause the ac not to work properly.
discharge pressure is high, suction pressure is high superheat is low and subcooling is high.
Connect the pressure gauge to the high pressure port. Discharge your Freon into the low pressure port. Stop the Freon discharge when the Freon engage reaches the appropriate level.
R134a goes into the low pressure port
Th low pressure valve s located to the right of the site glass (where you check your freon activity) The hose is black with a nozzle on it and has a nipple you can check for pressure. Close to black low pressure line a blue high pressure line
High head pressure; low suction pressure; overheated compressor
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.....
low on freon or too high pressure or thermostat
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.....
Check the low and high pressure switches, the AC fuse, and relay. Any of these can cause the AC to not get power to the clutch as if the freon is too low.
Seized? Low freon charge? High head pressure?