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Old 20 Jul 2010, 03:16 pm
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Default How do I drain most of the a/c R12 refrigerant from my car without specials tools or vacuums?

I am converting over to R134. I have a 92 Accord. Its old and I just want a/c to last for a couple more moths until the summer is over. How do I drain the R12 without any advanced tools so I can add the R134.
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Old 20 Jul 2010, 03:31 pm
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You have to vacuum it out completely or you will have one ****ed up ac system. SOLUTION: If you have an auto zone close they rent tools. They are also 100% refundable. Get the gauges so you can measure how much you put in when you refill it. Get the vacuum so you can vacuum it out. Takes about 1 hour for it to suck it all out. You will also have to buy and adapter to go on the ends of the R12 fitting, to adapt to the quick connects. Total to rent vacuum and gauges $325.98. 100% All back on my visa now. The adapter fitting are about $12 plus tax.(READ THIS) You CAN change it over to r134a from R12 without major changes, thats the biggest bull ive ever heard. I changed my 91 buick roadmaster from r12 to r134a.
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Old 20 Jul 2010, 03:46 pm
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You can't and it's against the law to release it into the atmosphere. It must be recovered.

Also, you just can't change from r12 to r134 without major changes to the system.

Do you know what you're doing ??
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Old 20 Jul 2010, 04:01 pm
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Posts: 239

you dont....doing so and f'in something up or discharging the system into the air is against the law...resulting in HUGE fines and jail time....or better yet go ahead an drain it. then ask yourself was it really worth a few thousand dollars for a fine to make sure your car was retrofitted when retrofitting a car at a shop where they can recover and inspect your system is really cheap.....

R-12 was used in most refrigeration and vehicle air conditioning applications prior to 1994 before being replaced by R-134a, which has a lower ozone depletion potential. When older units leak, retrofits to (1,1,1,2-tetrafluoroethane) are recommended. Retrofits to R-134a require complete flushing and freon filter replacement to remove the mineral oil. Mineral oil used for R12 is not compatible with R-134a. Some oils designed for conversion to R-134a are advertised as compatible with residual R-12. New rubber hoses which are R-134a compatible may be needed for the same reason.

In systems where R-134a is not practical, R-409A (60% R-12; 25% R-124; 15% R-142b) may be directly added to an R-12 system without oil change although a filter change is always recommended. R-409A usually runs at an low side of 12 p.s.i. while R-12 usually runs at a low side of 10 p.s.i. R-409A runs at higher pressures and is less efficient but works quite well. Manufacturer recommends that existing R-12 charge should be recovered. The two refrigerants, however, mix fine because they dilute with the same mineral oil.

1,1,1,2-Tetrafluoroethane is an inert gas used primarily as a ?high-temperature? refrigerant for domestic refrigeration and automobile air conditioners. These devices began using 1,1,1,2-tetrafluoroethane in the early 1990's as a replacement for the more environmentally-harmful R12, and retrofit kits are available to convert units that were originally R12-equipped.

Recently, 1,1,1,2-tetrafluoroethane has been subject to use restrictions due to its contribution to climate change. In the EU, it will be banned as from 2011 in all new cars. The Society of Automotive Engineers (SAE) has proposed 1,1,1,2-tetrafluoroethane (HFC-134a) to be best replaced by a new fluorochemical refrigerant HFO-1234yf (CF3CF=CH2) in automobile air-conditioning systems. California may prohibit the sale of canned 1,1,1,2-tetrafluoroethane to individuals to avoid non-professional recharge of air conditioners. A ban has been in place in Wisconsin since October 1994 under ATCP 136 prohibiting sales of container sizes holding less than 15 lbs of 1,1,1,2-tetrafluoroethane, but this restriction applies only when the chemical is intended to be a refrigerant. It appears, for example, that it is legal for a person to purchase gas duster containers with any amount of the chemical because in that instance the chemical is neither intended to be a refrigerant nor is HFC-134a included in the 7671a listing of class I and class II substances.

Contact of 1,1,1,2-tetrafluoroethane with flames or hot surfaces in excess of 250 C (482 F) may cause vapor decomposition and the emission of toxic gases including hydrogen fluoride and carbonyl halides. 1,1,1,2-Tetrafluoroethane itself has an LD50 (lethal concentration for 50% of subjects) in rats of 1,500 g/m, making it relatively non-toxic. However, its gaseous form is denser than air, and will displace air in the lungs. This can result in asphyxiation if excessively inhaled.[10][11]

Aerosol cans containing 1,1,1,2-tetrafluoroethane, when inverted, become effective freeze sprays. Under pressure, 1,1,1,2-tetrafluoroethane is compressed into a liquid, which upon vaporization absorbs a significant amount of thermal energy. As a result, it will greatly lower the temperature of any object it contacts as it evaporates. This can result in frostbite when it contacts skin, as well as blindness upon eye contact.

R-12 was the most common blend used in automobiles in the US until 1994 when most changed to R-134A. R-11 and R-12 are no longer manufactured in the US for this type of application, the only source for air conditioning purchase being the cleaned and purified gas recovered from other air conditioner systems. Several non-ozone depleting refrigerants have been developed as alternatives, including R-410A, invented by Honeywell (formerly AlliedSignal) in Buffalo, and sold under the Genetron (R) AZ-20 name. It was first commercially used by Carrier under the brand name Puron.

that all being said.....dont be a tool
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