The ac will not operate without any r134
Could you have it diagnosed at a local dealer or mechanic and let them find whats wrong first and then you can determine if you could just fix it on your own?
I personally don't advise much if I have no idea what techincal skills people may have and instead of getting into things that maybe over your head?
Its much easier in my opinion to have a qualified person determine whats wrong first and then what its going to cost to fix.
In your case sounds like a fan switch not kicking in at the preset temp
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