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I can find no information on the location of the low pressure port within the AC system on my 87 Spider. There appear to be three ports, two on the compressor, and one on the dryer. Can someone tell me which is the low pressure charging port?
Thanks,
Mike Morgan
 

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Trained (ex)Professional, , 1953-2018 RIP
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The ports on the compressor have a letter to ID each port. The letter 'S' is for suction (the low side). 'D' is discharge, or high side. The port on the dryer is high side.
If you can't see the letters, just locate the hose that runs from the firewall to the compressor; this is the low side.
 
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