Capillary Tube:

Capillary Tube

Refrigerant can pass into the evaporator under the following conditions:

If the capillary tube is restricted or blocked.
If there is moisture frozen in the tube.
If the screen is clogged.

This stop will be the cause of high vacuum reading. Evaporator heat, I. capacitor will be cool. There will be normal or low pressure. If the refrigerant of low, capillary tube will hiss as the compressor is switched off. In addition, the low side and high pressure will be lower than normal. Above the normal low pressure and normal or below normal pressure points to inefficient pump...

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Capillary Tube