It takes a while to fill the freon,with the clutch cutting off and on,it will take a while for the freon to get in the system,now you can remove the connector to the low side pressure switch ,located on the dryer,and jump the wires together to make the compressor stay running.Two cans will be pretty close,to the amount it will hold,be sure to hold the can upside down,you want the fluid to go in the system,not the gas.Now after the freon is in the system,two cans,and the compressor low side pressure still is low,like ,20 psi,or lower,then let all the freon out,and remove the orifice tube,and clean it,then put it back in,and freon it up again,this will fix the problem.The freon leak will most likely be the compressor,it was a bad design,the ht6,and they leak at the seams.I hope this was helpful,and be sure to put the connector back on the switch after freon is added.Please rate if you would,thank you.
I'm assuming that's the high side pressure reading. It sounds like you don't have enough refrigerant in there still. Depending on outside temperature the high should be around 130-150 and the low side between 25 - 30 or so with the compressor clutch engaged. Once you connect the can to the low side you'll have to start the car and turn the a/c on to get more in there until the pressure readings are correct.
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