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Yes, Argon is fine to use.
I do not recommend any except R12 or R134a for several reasons...
I suggest that you first be sure your system is in good shape.. have you cleaned your evaporator fins ? This is something seldom done and sometimes not fun or easy... but very very important... if they are clogged up with whatever.. you are not getting good air flow over those cold fins.... so your air can not be cold in the car...
Then... your condensor... the bottle neck of all AC systems... think about upgrading the fan and being sure your fins on it and the radiator behind it all straight and clean..
Those would be the most important and effective things to start with... and assume they will allow the R134a to do what you need for cooling...
I have three autos with R134a here in the middle of Texas... and in a humid spot to boot.... and they all do just fine...
Be sure your basics are up to par before considering going to some off the wall refrigerant.....
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