hey guys, what do you think. Troubleshooting a 2 ton Ac, R22, low side psi goes from 40 up 73, then drops to 40 and gradually climbs to 73, then drops to 40 repeat, repeat. The odd thing is the head psi remains constant at 223. I pulled the cover from the evap coil and it is a 2 ton coil orifice metering device. Coil is clean as a whistle.?????