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Recover R12 then flush system. Change drier or receiver tank depending what vehicle you have. Change expansion valve or orifice tube again depending what vehicle you have. Install the R134a Hi and Low service ports and put the correct amount of compressor oil for R134a freon into compressor. Pull unit into a vacume for about 15min. and leave it set for another 15 or 20min. to make sure it stays in a vacume and there are no leaks. If it holds a vacume charge the unit with the correct amount of R134a and run unit and check that it operates and cools properly. If all is good install the service port caps and your done.
no --it cannot. R12 gas operates at a far lower pressure that r134a so if you want to use r134a gas you will have to replace compressor ,evaporator and condenser and have a cooling fan for the condenser fitted
This car uses R12, it is no longer available, you must convert it to R134, this requires the compressor and reciever dryer be replaced and the system flushed out and the new PAG R134 refrigerant oil be added and new charging port kits installed. Is that car worth this effort?
Unless the labels are missing from the car, it will state which type of refrigerant is used. Could be either R12 or R134a. If originally R12, it could have been replaced by R134a with an upgrade kit. The easiest way to tell if the labels are missing, is to look at the valves on the AC system. If they are Schrader valves (same as used on tires), then it is the older R12. If the caps are Red (high pressure side) and blue (low pressure side), then it is R134a. The sale of R12 to non-certified mechanics is illegal in all states as far as I am aware. R134a is available in most states and retro-fit kits are available in most states.
I have done the retro-fit on 2 vehicles with acceptable results. It is recommended to remove all the old R12 with a vacuum pump. Autozone (in my area anyway) rents these.
Good luck if you need and decide to retro-fit yourself.
Good day,
The problems that occur on R12 systems are no different than the newer R134A units.If it involves using R12 it would be a little more expensive, but since they use approx. 6 to 8 ounces it really isn't that bad.
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.
You can use R134a compressors with the Poly oil in them and use R12 or R134a (flush the remaining old mineral oil out of the system first). Match your BTU requirements.
Prior to 1999, all refrigerators used R12,commonly called "Freon". After that date due to mandates by the Montreal Protocol, the refrigerators were forced to switch to R134A, the same refrigerant used in automobiles since 1994. R134A is less efficient, and far more troublesome than Freon 12, but the manufacturers had no choice. Somewhere on your machine there is a placard that lists they type of refrigerant. Inside the freezer compartment or fresh food compartment, along the front rail of the machine behind the grille, or on the rear of the machine, many times even on the compressor itself. It will usually give the amount of charge in ounces along with the type of refrigerant. If it says dichlorodifloromethane then it is the old method of describing R12. Units in leisurevehicles running on gas instead of electricity, use ammonia.
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