The capillary tube is restricted when the flow of liquid refrigerant through the tube is completely or partially interrupted. Symptoms are similar to those of a system that has lost its refrigerant. However, the major part of the refrigerant charge will be pumped into the high side (condenser), the same as with a moisture restriction. The suction pressure will range slightly below normal to very low (2 to 20 in. vacuum), depending on the amount of restriction.