Disconnect the battery, then connect the freon so that as much as possible will go in, then re-connect the battery and start the car with the ac on high until you get the proper amount of freon.
Look to see if the compressor is running when the ac is on. If not, then check the Freon pressure, as the compressor won't run if the Freon is low.
you cant unless you have a a/c recovery machine.gm Jim
low on freon or too high pressure or thermostat
There is a pressure swithch in the line that keep the compressor from running if there is not enough Freon in the system. You wouldn't have any power at the compressor if you are low.
If the compressor is not engauged, it is ok.If the compressor is not engauged, it is ok.
if the compressor is Running you are low on freon, if its not then you have a electrical problem
A/C compressor not running
If compressor is running 80-100% of time without recycling, it may still be low on freon. If freon pressure is good, may be expansion valve.
Low pressure line Larger line running from compressor
If the compressor is running, the blower is blowing, and there's no cold air, you need freon. If the whining is from under the hood, the compressor may be damaged. That's what happens when running without freon.
How do I put freon in a 2002 Cadillac deville
Compressor not running?Heater control in heat position?