Compared with the cost-performance ratio, R507 is 30-40% . R-12 expansion valves can be re-used, but will not be as efficient as R-134a specific ones because of the slightly different pressure specs of R-12 vs. R-134a. I used a full can of evap cleaner. Thread starter goldNSX; Start date 1 August 2009; Tagged . A slow loss of cooling at city speeds is usually related to condensor capacity & airflow issues. R12, on the other hand, is called chlorofluorocarbon (CFC). and he synthesized R-134a in 1936, 5 years after R-12 was . Thus, when the system is running, condensing the CO2 is not a problem. Heres some important advice Whenever you notice your R12 refrigerant is leaking, turn off all flames and open the doors so it can escape to the open atmosphere. That's a lot isn't it? The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. Its chemical symbol is CCl2F2. Read on for more information about using automotive r134a in a refrigerator and vice versa. link to How to cut off a Catalytic Converter. For example, if your system originally had 36 ounces of R12 then you multiply that by .80 and you have 29 ounce of R134a. Anyone know what happens when an R12 expansion valve is used in a system charged with R134A? I just got some hi/lo side gauges so I'm going to take readings, if they are needed. You do not want to exceed the systems high side recommendations. Some 1993 and older R12 systems aren't as 'compatible' as you'd think to switch over. . . evarporator, expansion valve plus flushing out the full system and replacing all the o rings. Even with proper fan operation, missing seals & air dams can effect condensor effeciency. In 1994 they switched from R-12 to R-134a. R12 is otherwise called dichlorodifluoromethane is a colorless gas (chlorofluorocarbon halomethane (CPC) that is used as an aerosol spray propellant and a refrigerant, and is soluble in organic solvents. The original CFC expansion valve used for R12 needs to be replaced with an HFC one for 134a to feed the evaporator correctly. However, the supply houses don't indicate a difference. Rules governing changing from the former to the latter differ between countries. You'll get marginally better performance out of the change as the expansion valve is matches the refrigerant characteristics. At the time I thought nothing of it, but now I am thinking maybe that is contributing to the system not working as well as it could. Since you will be using less R134a than R12 you do not want to rely on the driers site glass to determine if the system is full. James10952001. Production of R12 ceased in 1996, although it can still be reclaimed, purified, and resold, and small cans of New Old Stock R12 are still widely available on eBay and Craigslist. We mention using ester type refrigerant oil. Pray I can let some oil out of the compressor without losing my precious R12. compressor, condenser, evaporator and expansion valve are specifically designed for use with R134a. Mark Baker R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. Not going to mess up your 'do, but you can feel it. 5. sparkee said: Thanks for the Service Bulletin. CLUTCH CYCLING SWITCH. El maig de 2016, un grup damics van crear un lloc web deOne Piece amb lobjectiu doferir la srie doblada en catal de forma gratuta i crear una comunitat que inclogus informaci, notcies i ms. Als nostres webs oferimOne Piece,Doctor Who,Torchwood, El Detectiu ConaniSlam Dunkdoblats en catal. #13. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. To bless the system the technician should attach a R134a sticker somewhere in the engine compartment to note the car is using R134a. At 2000rpm, windows open, highest fan, hi pressure stabilized at 225 psi, low 25psi.Ambient 81F, vent 61F. _____ 2012 E350 2006 Callaway SC560 . If your car does not have a high pressure cut-out switch in the AC system then youll need to have one installed (call us if you need help). Instead of using R12, its preferable to use R134a because it is very easy to find in the market, its sold at an affordable price, and is environmentally friendly. In more serious, it could result in cardiac irregularities or death. The smoking question & vent airflow indicate that the evaporator is fairly clean - and you are aware of the importance of that.The heater valve stops the flow, but there is always some conduction heating. hardly noticable. System has been working fine for a year. At this time you can still find R12, but, because it is no longer produced, availability is limited to current inventories and the price per pound is greater than R134a. The oil used in R12 systems is not compatible with R134a refrigerant. There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. However, take note that R134a refrigerants are manufactured specifically for automotive air conditioners. The crossover point is approximately at 64F. Measure what you have now.3) Go back to the page in step one, and find the largest condensor you can put in your vehicle. How dumb!I will jumper the aux fan and redo the test. Your decision could be made based on economics, environmental concerns, or both. is good, then I should be looking elsewhere? _____ 2012 E350 2006 Callaway SC560 . "Howdy, Folks!" a 50f delta across the condensor is good, but I suspect that is an idle reading. shown for the parallel flow, aluminum condenser that is listed. R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. ). It does not "pool" to any degree in a large amount anywhere. Thanks again. I had to vaccum the system for 2 hours and recharge 4 oz of PAG oil plus 36 oz of 134A freon (3 cans). Failure to abide by the EPA regulations can result in expensive fines for either you or your service technician. This implies that the discharge pressure of the compressor should be moderate so it can produce the refrigerants condensation in the condenser at the atmospheric temperature. Just because the radiator does not boil people assume that the cooling system is ok. But I don't want to waste your time. The safe high side pressures are determined with a PT (pressures and temperatures) chart. You will be fine with a 134a-compatible TXV running R12. The car never overheats, if that has any import. I have some experience with auto a/c but not too much. The MB chart shows 360 psi with R12 in some conditions. The original rubber a/c hose lines in your car will leak out R12 through the hoses lining. Your average garage that works on a/c on the side probably would not have this. According to Wikipedia, There is such a thing as "r132a" (1,1-Dichloro-2,2-Difluoroethane), however there is no indication of it being a commercially produced refrigerant. Can I just use an adapter and save $200? My turn to LOL - greasiesel! I don't think it has any air dams or seals, I'll check to make sure. R134a refrigerant is lighter than R12. It is usually sold under the brand name, Freon 12. The Wikipedia explanation for expansions valves cited in Frank's thread says that the gas inside the bulb in the metering valve is the same as the refrigerant in the system. With tube & fin condensors in MVAC applications there is never "too much" airflow. Its highest value is 1. Recovery & flushing is the only way out of an oil overcharge in your vehicle.B. Blows pretty hard on full. The major reason for the replacement of R12 with R134a was to curb future greenhouse effects. A/C systems designed to use R-12 will cool best when charged with R-12 refrigerant. . I'm doing one thing at a time so I know what the cause was. In sum, R12 has done more bad than good. gital control scheme. It won't be optimal, though. I'm going to check the condensor is way clean too. Generally the system will be initially charged with approximately 80% to 85% of the original amount of R12, using R134a. The name of the oil is Polyol Ester (POE). R12 is simply too expensive for a 25+ year old A/C system. I'm also thinking maybe I should go to R134 - it might work better with the right amount of oil and the correct expansion valve. It runs between the condenser outlet, receiver/drier unit and expansion valve at the firewall. CR4P). difference between r12 and r134a expansion valve why is miles raney not on homestead rescue June 21, 2022. manila mayor candidates 2022 R12 is highly destructive to the earths ozone layer. Given two identical vehicles, each with the same weighted amount of refrigerant, the vehicle with the R134a has the capability to remove more heat (measured in btus) from the vehicle than the same type of vehicle using the same amount of R12. You do not however need to replace all the o-rings or seals for a simple conversion, it is simply a logical thing to do when and if the time comes to work or replace certain components because of age issues. A slow loss of cooling at city speeds is usually related to condensor capacity & airflow issues.You could improve the cooling capacity by replacing the condensor with a high effeciency parallel flow unit. Have a look in the FAQ Section, and look for "Fan clutches & testing them". The current expansion valve is FF - 1/4 - C. Is it neccesary to replace this valve? The chemical composition of R12 and R134a differ. Paul:It is never a waste of my time to chat with someone that understands the problem, and wants to fix it. Well, I'm not sure it is 'fine' - it doesn't cool very well in 95F weather. Automotive Replacement Expansion Valves & Parts; Industrial & Scientific; Customer Reviews. . With the oil leaking out and being told all sorts of things about how these compressors don't have a sump etc, I wanted to be on the safe side. In large application systems, the vapor density of this refrigerant is usually high. For R12, its mineral oil. Put a relay on the compressor clutch to the aux fan (I like that idea - makes a lot of sense)How does that sound? It is made up of carbon, hydrogen, and fluorine. Please enter a valid email address for yourself. 2) Frost on the Vents. The butylcellusolve or the citrus solvent will dissolve the carcass in a few minutes. R1234yf is more environmentally friendly and has a global warming potential of 4. Hence, let us continue to fix it. As for R134a and R1234yf, theres no room for conversion. Also, would a genuine R12 TXV be better, or is it too marginal to worry about?I think I should do the FSM test for performance - they have a graph with ambient temp and a/c temp. by | Jun 21, 2022 | what is the most accurate latin translator | burlington iowa arrests | Jun 21, 2022 | what is the most accurate latin translator | burlington iowa arrests I don't believe it is but I had a service guy tell me it needs to be done. You do not need to replace every o-ring in the system, but if you happen to open a connection that has an o-ring you should replace the old o-ring with one that is compatible with R134a and lubricate the o-ring with ac oil. First, differences in physical properties: 1, insoluble R12 compressor oil is used (to reduce the lubricant) 2, dissolved sealing materials are used (resulting in refrigerant leakage) 3, easy to damp (so easy to internal . -------------------------"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest." When I compare parts, 93 uses one part number and 94 has a different part number. It is perhaps possible to locate a unit with a company that purchases close out or distressed merchandise. Make sure to wear safety gloves, goggles, and shoes when theres a possibility of exposure to the chemical (R134a). I'm not sure. Expansion valves are an active device, they regulate the flow of refrigerant to the evaporator depending on evaporator temperature. The most common influences which effect the capability of R134a to perform well are the condenser, in some cases the the superheat setting of the expansion valve or the amount of R134a. To prevent refrigerant loss you should consider replacing your old hose lines with barrier type hose. Instead, top off R12 with R134a refrigerant. 4) Repeat step 2, making sure it will fit. Look deep into the fins. Further production of R12 was banned in some developed countries by the Montreal Protocol because of its harsh effect on the ozone layer. So if you car has a large amount of rubber hose, such as a 40 feet with the 911, then you will be re-charging the system often and that is expensive no matter which refrigerant you use. 3 ounces? Whether R134a performs as well as R12 in any given a/c system depends upon system components and the amount of R134a used. So if you car has a large amount of rubber hose, such as a 40 feet with the 911, then you will be re-charging the system often and that is expensive no matter which refrigerant you use. All fans must work at 100% of the OEM rating. Also, if you want to know what happens if you put R134a in an R12 system, you should first confirm if the R12 system can be replaced or if the refrigerants can be mixed. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. When ever possible you should ask the technician to note the same information on your repair bill and keep a copy in your glove box for future reference. R134a. The best oil that runs well with R134a is PAG oil or Polyalkylene Glycol.
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