Posted by Bob on July 06, 2014 at 18:14:27 from (75.238.133.101):
In Reply to: A/c pressure readings posted by Jeremy in NE on July 06, 2014 at 12:22:42:
Since you are evacuating the system and starting over, WHY not just install the factory-recommend amount of refrigerant?
No sticker with info? It's still better to take the effort find out what factory specs are than to muck it up.
NOT sure what you are working with, but if it is a never R134A system with an orifice tube (rather than a TXV) charge is critical.
If it is an R12 to R134A conversion, about 80% ( by weight) of the original R12 amount will do the trick.
If it is an older ex-R12 system, and you want some cooling without blowing hoses and NOT being cool and spending $$$, slightly UNDERCHARGED is better than a bit overcharged.
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