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Actually driving your truck is speeding up the compressor. I don't think they put sight glasses in refrigeration lines anymore so unless you know how to use a gauge set you are just guessing. If you do have a sight glass and you can see bubbles...throttle it up some and see if the bubbles decrease. If so it is most likely still low. I hope this helps.
If you are concerned I would let a reliable mechanic check it out. I am familiar with basics of refrigeration but thats where it ends for me. I have went further before and been very sorry. Over charged and ruined a compressor on an older Subaru.
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