You can also find refrigerants with dye in it as well, that way you can take a uv light to see where its leaking from but if your not planning on fixing it (if it is leaking) I would skip the dye.

Also there was no humidity, we're known for our snow here in WI.

My friend didn't want to pay to have it emptied and I felt it was overkill to empty the system, I've done this on a couple dozen of cars and it seems sufficient enough to get a reading for the high side in a general ball park (relative to ambient temp). I've only had a handful of systems emptied whe...

So here is my story, I'm working on a friends 2001 Saab 9-5. I was reading 30psi on my low side and 200 on the high, I added some refrigerant and dye and the low got up to 40psi. The high would build up to 250 and than drop back to 200 once the fan kicked on and the low slowly dropped back down 35. ...