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Take it to a pro. Charging a refrigerant system isn't for amateurs. There are plenty of things you CAN do to maintain/repair your truck, and I (for one) will be glad to help you learn how, but this isn't one of them. Alignment, auto trans repair, & differential setup are others. Airbags are easy & safe compared to refrigeration. Yes, many people do this, but they rarely do it right.
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