Another ac thread

[iceman]

Usually when the valve becomes plugged it will ice up around the valve and towards the coil (low side), because the refrigerant pressure is much lower on the outlet of the valve, thus making its temperature much lower. Fairly good starting point on the gauge pressures is 100 condensing temperature and 35 degrees evaporating. Converting the pressures to temperature with a PT chart or on the gauges will show this. Higher ambient temps acroos the coil at the radiator will drive the high side pressures up. Low air movement/plugged evaporator at the cab coil will drive the low pressures lower.