To the left of the compressor and attached to the side of the radiator is a unit that is not part of the original installation, but was felt to be very important so it was added. It is an accumulator in the low pressure intake line. It's purpose is to protect the compressor from damage should some liquid freon exist in the intake line. Shoud liguid get into the compressor, it could very possibly cause it to self destruct as liquid doesn't compress and the compressor would end it's days. That would not be good!
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