Adding freon

[lutronjim]

I have always heard that you added freon until the bubbles just stopped in the sight glass which I have done in past.

I recently bought freon that had a gauge attached. Instructions said to add freon to the low pressure side then stop, let gauge stabilize, and if in green quit adding freon. Too much pressure might occur in operation if you added to try to get to the top of green.

I followed instructions. When I put the cap back on and checked the sight glass - there were still bubbles flowing.

Too me that says its still low. Which is correct?

If it makes a difference it a VA system on my LS 70ss that is several years old.

Thanks