Inadequate Cooling After Short Period of Operation

Inadequate Cooling After Short Period of Operation

Cooling is OK at first, but then decreases in effectiveness during operation.

Vaporizer is iced up. De-icing switch does not turn off compressor. Check capillary tube for damage and correct seating.
or
Expansion valve iced up. Warm expansion valve. The cooling effect of the air-conditioner should start back up.

Cause:
Moisture in refrigerant.
Replace refrigerant tank.
Refill system.