If you have a 13 seer, 3 1/2 ton Carrier Puron system. Has a factory installed TXV installed on the evaporator. System pressure run 125 low side and 365 on the high side. Liquid line temperature reads 99 degrees which corresponds to the 11 degree subcooling required. After system pressures equalize and system is restarted the low side pressure will slower decrease, within 15 to 20 minutes the pressure will be down to 80 or 90 and will start frosting up all the way to the condenser. Head pressure stays the same and after 15 minutes the liquid line temperature starts dropping. TXV bulb is mounted correctly, there is adequate airflow across the coil. When the bulb is disconnected from the suction line the the same result. Just wondering what anyones answer to this problem would be.