I just installed a new compressor and have put in 3 cans of Freeze 12. I still see bubbles at the sight glass so I guess I will need more. I'm surprised because the DIY article at Diesel Giant said it would require less than 3 lbs. Any thoughts on this? And does anyone have any specs for the numbers I should be seeing on my AC manifold guages?

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85 300D
245K and running strong