Yeah This is what I do sometimes. However I am constantly told by so called experts that you need to do what the manual says. From my experiences I think that is crap. I am trying to learn you have to understand this. I question why every time the manual is wrong. If I pull a vac and let it rip it is usually close within 4-8oz based on my chart and the Desired SH for conditions. What I question is am I not doing it correctly because when I do it this way it is so different than the way the manual tells you. My competition does not even do this it is pretty sorry situation where we live. What Oem chart do you use? or do you have a universal one. It seems they would all be similiar with like freons doesnt it.
Originally posted by prodiyer
Txv's should be standard. Your scale, gauges and themp probes could all be off. I dont know what other advice I can give you. Pull a vacuum, crack it loose and then charge by superheat.