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Q: What is the low side on 1991 Nissan Pickup (D21)

what is the low side
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The opposite of "the high side!"




The fitting to add more freon to the A/C system. I assume you have ask where to charge the A/C system and was told that. Instead of me typing a bunch of words, try youtube and search for a video on how to charge an A/C system. Bet you will find one!
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