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It doesn't take freon, it takes R134A. There should be a sticker in the engine compartment that tells the amount. but when filling low side should be somewhere between 25-45 and high side 150-300. if you are serious about charging your own system please purchase a set of manifold gauges. it is the only way to properly charge the system. Harbor freight tools has a set for $45 and big lots sells refrigerant for $6. using the pregauged cans to fill your system is a hack way to do it and can be harmful to your ac system. Properly charging the system has a direct relationship to the outside ambient temperature and you can find a R134A reference chart on google images with a simple search. Good luck and also there are some pretty good videos on youtube about using manifold gauges and recharging refrigerant.
Not sure I understand. R134a is the refrigerant. So what else are you adding? The best solution is to find the leak and repair it. Leaks will continually become worse. Your system may not hold anything anymore. However having to much refrigerant will overcharge the system and not allow it to cool. All systems hold different amounts, there should be a sticker under the hood that tells you how many pounds the system holds.
Thats pretty high if the system is not running. Average pressure on the low and high side should be near outside air temp. Normal low side is 30-40 psi and high side is 200-250 psi when the system is running and the freon charge is full.
You should have the manual for this unit handy and as far as recharging tools go. You only need a can of R134a *(if the unit is R12 you need to buy upgrade adapters since R12 is no longer sold) Run the unit and put the R134a filler line on the low pressure side of the compressor *(from manual...dont guess as trying to charge the high pressure side is VERY dangerous). Get the charge just into the Green zone on your charger and that is it! Try not to fill too high in the green zone....I know it sounds funny...but AC's usually work better when they have the low end of their optimum fill. R134a doesnt work as well as R12 so be sure you buy the R134a with cooling enhancers. Your local Autozone can guide you to the right filler/product combination.
It depends if you are replacing the compressor, if so normally runs about 6 ozs. to 8 ozs. depending on size, check the charge sticker to see what the total freon charge amount is and get back to me. Also is it R134A or R12? it makes a difference on what oil you are using so you don't mess up the system. And do you have the system open? Let us know. every car is different in quanity.
R143a is what you use, there should be a sticker in the engine compartment for the specs to the amount of R134a used in the A/C system to your car. Good luck and don't over charge the system. Keep me posted be glad to help.
Can you hear you A/C compressor kick off and on when you press the A/C button slowly off and on (off 3 sec, on 3 sec, repeat)? If your R134a i charge is low, system pressures can drop and the system will stop functioning to protect itself. It may need to be properly charged. The dealer or a service center will want to check the car, then charge it and add dye to diagnose it. This is normal. They usually request that you drive the car, use the A/C and come back in to check and see if the dye leaked out anywhere. You can verify that your car has r134a on the factory sticker under the hood or near the radiator. DuPont has a small can of SUVA or 134a at most parts stores with oil and dye. You could put it in yourself if you feel comfortable doing so and you follow the directions. Good luck.