today I'm working with the a/c. I bought everything to change it R-12 to R134a and fill it. Let's do this

 

 

did you buy a vacuum pump, and a real manifold gauge set? if its just leaked out and been empty a while normal air will be in the lines which is not compressable, and even fi u recharge it, it will not cool very well. You also need to charge the system with a r134A compatabile oil or the compressor will burn up. as most oil that came with r12 systems will not suspend in r134A

 

Honestly... just pay a shop to do this. Not a Jiffy Lube... a real shop. Let them use their machine to evac and recharge or it will never be as good with a DIY fill simply because you can't pull a vacuum on it yourself. It only costs $150-200 to do a fitting conversion and evac/recharge. I've worked at a couple shops.

 

Thanks guys for those advices. I did and it work perfect. I live in Florida and the sun is really hot and the ac work very well.

 

Glad you got it working. The best thing as mentioned above is to pull a vacuum on the system. This boils and removes all traces of the old refrigerant. This will allow the system to accept the proper amount. Having a manifold set is great but having an a.c. machine is even better. You would have needed to know the exact charge amount and it differs between R134 and R12. Adding too much can severely damage the system and adding too little will not yield good results for an extended period of time.