Tagging this for same info, but mine's a 2001 gas Silverado.
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Where do you get the dye?
Walmart even has refill kits that include dye.
Thanks for the suggestion. I had tried that in the past, with no dice.
Had a local shop that could get it in on short notice take a look, and it turns out that the compressor was cooked.
Reclaim coolant, replace compressor, and recharge and it's all good now.
Yeah I'm currently driving around the desert recharging my A/C every 30 hours or so at the moment.