It may take a couple of tries to get things really clean.The laser is usually close on clean surfaces, but I prefer a T/C. Compared with the cost-performance ratio, R507 is 30-40% . Jun 17, 2011. If your compressor requires replacement or its seals and o-rings need to be replaced due to leakage, it would be wise at this time to either obtain a compressor that has o-rings and seals that are compatible with R134a or have your unit re-manufactured with compatible components. The car never overheats, if that has any import. Bad Car A/C Expansion Valve Symptoms. video clubhouse baseball; nick fairley draft profile; ben davis work pants In the automotive world, the replacement for R12 was R134a. Thanks so much Bohica - you've save me many more hours of fruitless speculation. However, if it is taken close to a fire flame or any electrical heating element, it disintegrates into toxic products. and he synthesized R-134a in 1936, 5 years after R-12 was . Also, it can be used with all types of compressors. Expansion Valves Catalog E-1, July 2012. A thermostatic expansion valve (TXV) (see Figure 1) is a refrigeration and air conditioning throttling device that controls the amount of refrigerant liquid injected into a system's evaporatorbased on the evaporator outlet temperature and pressurecalled the superheat. sparkee said: Thanks for the Service Bulletin. RULES for AOP - Owner Assistance and Contractors, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, How To Become a Pro and Rules For Pro Members, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. The cure is to use the newer R134a compressors is sealing washers that are different thickness. Is there a graph? R134a is NOT less efficient than R12 Actually R134a is more efficient. 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. When you add fluorescent tracer dye to with the refrigerant oil it helps to track down leaks that push oil out of the system. Since there is only about a 10% difference between R-12 and R-134a, the expansion valve being self-compensating really doesn't make that much difference. Though - the valve for a 1991 says R12 on it, and for a 1994, it says R-134a. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. american sniper longest shot; how to adjust sunsetter awning arms; pastor jeremy roberts texas. 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. Its not that difficult but the procedures of evacuation, charging and testing should be done by a licensed a/c technician that is experienced with R134a and your particular car. I'm just trying to help you avoid headaches in the long run. Automotive Replacement Expansion Valves & Parts; Industrial & Scientific; Customer Reviews. Is it exponential, squared? Interestingly, theres one oil type that works perfectly with both types of refrigerants. Energy usage: R134a is less efficient in cooling compared to R12. Catalog E-1, Thermostatic & Automatic Expansion Valves / Page 1 Table of Contents . . These two refrigerants are the older types and are not used in newer refrigeration and air conditioning systems. The money you will save by will pay for the R12. Moreso, it had been banned. 3) A TXV optimized for 134a will be ok with R12. R134a. 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. Generally you follow the refrigerant flow moving from connection to connection, component to component, and you sniff the a/c vents to check for evaporator leaks as well. The best oil that runs well with R134a is PAG oil or Polyalkylene Glycol. I had a 1991 BMW switched to 134a by just changing the low pressure charging valve, flushing and refilling with 134 (maybe with 10% . Yep, definately not a meat locker. You can use this space to go into a little more detail about your company. AFAIK, there is no clutch on the engine fan on the 240D. You can also check the Aux fan in your case. of refrigerant insulation tape. Its chemical symbol is CH2FCF3. A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F. Get to the point where I can walk without crutches2. Large temperature difference between expansion valve inlet and outlet oReplace expansion valve Air . And yes - expansion valves sometimes need replacing if they are sticky - but a proper AC flush should eliminate the need for a new one if it's already in good condition. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. A/C receiver difference between R12 and R134a? There are R134a specific valves that operate at a slightly different pressure, but not for any "old" automotive application that I'm aware of. I don't know where it is getting the switch off command, or why the vent temp drops steadily. The ratings for evaporator temperatures 40F, 20F, -10F, -40F in the capacity tables are in accordance with ANSI/ARI = R134a Charge Level R12 Expansion Valve = 201 830 06 84 R134A Expansion Valve = 201 830 04 84 Is there a difference after all? We ALWAYS want to know the pressure readings! How is the vent airflow?I would jumper the aux fan & check the performance. Does it matter - assuming both are new & uncontaminated? R12 is used in several applications like low temperature, medium temperature, and high-temperature applications. 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. Concentration level: The R134a vapor dilutes the oxygen concentration in the air to a low level, thereby causing harm. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. R 134A is designed for the high demands of an automobile AC and cannot be used on refrigerators due to pressure differences. 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. Before R12 was replaced with R134a in 1995, it was mostly used in trucks and cars. With the A/c off hi and lo were both at 105psi. This would be a custom install, there is no "drop-in" condensor upgrade for that car.Check for proper fan operation, and clean the air path on both the condensor & radiator. Its chemical symbol is CCl2F2. Like say half a can or so recharge come springtime warm weather or something. Welcome to rxmechanic.com. That's a lot isn't it? What is the refrigerant property involved that has caused this? There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. What effect would it have on performance, if any? difference between r12 and r134a expansion valve . But R22 is almost equally damaging. I have a laser temp reader, and it says the temps going into the condensor are up to 160F - coming out it is always around 110 or so. The only difference I can imagine would be the recharge connection. I'm thinking I might have put too much oil in the system - everywhere i read had a different amount - the manufacturer of the compressor, the MB factory service manual, online forums. Rich Membership Chairman Using R134a in an R12 system will cause the oil not to move with the refrigerant, causing a system failure and probably won't even cool the system well, if at all. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. We are an automotive mechanic blog that helps mechanics and car users to find the most recent and accurate technical and repair information for their cars. Stopleak is also risky. 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. Low refrigerating effect per pound: In comparison to other refrigerants, the refrigerating effect of R12 per pound is low. Use strips of foam to couple the two heat exchangers if necessary.B. Any ideas from the info above? ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Just because the radiator does not boil people assume that the cooling system is ok. The catalytic converter is an essential component of your car's emission system that helps save the environment from harmful emissions. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. In 1994 they switched from R-12 to R-134a. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. So if the TXV is OK, and the too much oil situation is not a big problem, then I wonder why the compressor is switching off after about 15 minutes of cooling? VerticalScope Inc. All Rights Reserved. . This kit comes complete with Expansion valve, o-ring kit, and 1ft. It does not "pool" to any degree in a large amount anywhere. Don't like the sound of custom parallel condensor. Besides, R134a refrigerant was manufactured after R12 was banned to help reduce the harshness of the old chemical (R12) on the ozone layer. The Main change in the system is the expansion valve. Do I leave the orignal condensor in, etc?Thanks. Look deep into the fins. Its among the greenhouse gases and will keep adding the current problem of heat not leaving the earths atmosphere. Yes it will work with either Refrigerant! I'm doing one thing at a time so I know what the cause was. That way I will have reduced the oil by about 1/3 (assuming the oil is mixed evenly through the system). Participate in over 40 different forums and search/browse from nearly 3 million posts. It is common for eurocar threads to go multiple pages, and as Nick points out - sometimes cool is all you will ever get. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a, Bohica, You say the drop in performance is not linear with too much oil. Unfortunately, the R12 refrigerant doesnt always blow cold air. Biggest you can fit in there is best. GWP is a measurement of Greenhouse Gases and their effect on Global Warming. At least you do not have 16 ounces in there ( yup seen it before).For now, straighten all of the fins that you can, clean the condensor well, and re-test with the aux fan running. This is because R134a. It is also used in automotive car conditioning and the plastic industry. maintain the A/C of older cars. Shorting the plug for the refrigerant switch should run the fan when the compressor is on. They should be able to keep you comfortable on a long trip, but don't expect vent frost in 3 minutes or lesss.2) Too much oil can reduce cooling capacity, and the effect is not linear. The expansion valve is designed so that the temperature of the refrigerant at the evaporator outlet must have 8 to 12F (4 to 7C) of superheat before more refrigerant is allowed to enter the evaporator. For example, if your system originally had 36 ounces of R12 then you multiply that by .80 and you have 29 ounce of R134a. ThanksPaul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. Besides, its technology has been tested and trusted. Ask Our Pros-Owner Assistance - NO DIY advice will be given. Performance doesn't seem to have improved. The name of the oil is Polyol Ester (POE). If the system was upgraded by a professional it should have an upgrade sticker. 4 Stars & Up & Up; 3 Stars & Up & Up; 2 Stars & Up . The P H and T cond,sat of the HR12 at a T oa of 40 C were higher than that of the R134a, resulting in a higher P e than that for the R134a. I am ordering new parts, and planning to convert my system to R-134a. Ensure you contact a professional mechanic to do the work for you so you dont end up incurring more costs for yourself. In no particular order, here's what I've found out regarding answering the questions posed so far:Fonebone - It is definitely an R4 compressor (they left the c off the front and the p off the end, i.e. Paul -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. Minor adjustments to the expansion valve and other controls may be necessary for some plans. 5) A/C System Failure. Flush with a garden hose - do not use a high pressure washer - you can bend the fins flat & damage the condensor.B. To ensure the right charge, you must fill the new system with between 75 and 85% of the factory-set capacity for optimal cooling. Recomanem consultar les pgines web de Xarxa Catal per veure tota la nostra oferta. Not osmosis, but you know what I mean). R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. You do not want to exceed the systems high side recommendations. 3) A/C Compressor Always On. Rules governing changing from the former to the latter differ between countries. It slowly gets warmer and warmer in the car, even at highway speeds. If you have a perfectly operating system using R12 you do not have to drop what you are doing and convert to R134a. (On firewall where A/C lines go into cab.) asia pacific stevie awards 2021. gin, amaretto cocktail. Carefully study the chart and compare the following: To a large extent, the choice is up to you. By using a black light the dye will glow in areas where oil leaks are visible. It is made up of carbon, hydrogen, and fluorine. If the charge is low the compressor will cycle on/off in the max AC position. Using R134a requires that Polyolester (POE) lubricant must be used in the compressor. Hope this helps. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. 2022 nba 2k22 starting a fashion label signing the designer, a difference between r12 and r134a expansion valve, 2020 white paper of the church of pentecost, Chime Mobile Check Deposit Funds Availability, Why Does James Kill Donald In The Vanishing, nba 2k22 starting a fashion label signing the designer. Use a strong surfactant like Simple Green or Zep Citrus, and soak the fins on the condensor. I have the original (R12) style expansion valve in the Maverick AC system. But I've read that these car's didn't do too well in the a/c stakes, so that might just be as good as it gets. Miscibility with oil: R12 can be mixed with the compressor oil no matter the operating condition. 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. Recovery & flushing is the only way out of an oil overcharge in your vehicle.B. Edited: Sat July 14, 2007 at 10:22 PM by fonebone. R134a is called tetrafluoroethane (HFC). difference between r12 and r134a expansion valve. Hence, the effect of R12 on global warming is up to 10,000 times higher than carbon dioxide. Reattach the hose lines using new R134a compatible o-rings, lightly lubricate with compressor oil. The good thing is that after you convert to R134 you can top off the system easily and cheaply. 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). The butylcellusolve or the citrus solvent will dissolve the carcass in a few minutes. Very nice! Tamb oferim en VOSC el contingut daquestes sries que no es troba doblat, com les temporades deDoctor Who de la 7 en endavant,les OVA i els especials de One Piece i molt ms. But some types of PAG do not mix well with the old residual R12 mineral oil left in the system components whereas ester does mix very well. Vent temperatures slowly go down to around 50F with hi speed driving. It cycles on off in med (or low for that matter)Gotta tell ya. There are significant differences between R12, R134a, and R513A, which must be considered when handling, processing, applying, or retrofitting with these refrigerants. How an A/C Expansion Valve Works. The aux fan didn't switch on though and I didn't check the high side temperature. difference between r12 and r134a expansion valve. difference between r12 and r134a expansion valve. On this website we are addressing only R134a and not other suggested drop in replacements. For example, at an evap temp of 30 (your daughter's system is probably running around 25-28 saturated in order to give a 32 duct temp), the pressure of R-134a is 26.1psi. Different correction factors are applied to other refrigerants. With R134a you do not rely on the site glass. The ARPA Zone/Open Membership Discussion Forums. Looks like a couple of things happening here1) 80's vintage Eurocars were not "meat lockers". 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. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. I have some experience with auto a/c but not too much. Should I do the test again with the the aux fan jumpered? You can buy bulk hose, and the proper fittings, then have them crimped off the vehicle.Be sure that no air bypasses the new condensor on the way to the radiator. Yes, this was a smokers car. The oil used in R12 systems is not compatible with R134a refrigerant. However, R134a is better than R12. They examined the two configurations of capillary tubes i.e. Poc temps desprs van decidir unir els dos webs sota el nom de Xarxa Catal, el conjunt de pgines que oferirien de franc sries doblades i/o subtitulades en catal. The global warming potential of R134a is 1430. Lasers don't do well on vent temps, a stick thermometer is better in that application. R-12 is no longer used or produced in many countries and remaining quantities have skyrocketed in price. The crossover point is approximately at 64F. Swapping the components isnt a herculean task, but recharging the AC is a challenge. I think the way to go here is1. As R134A refrigerant has different operating characteristics and pressures this valve is not necesssry. 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. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. The problem with using an approved alternative refrigerants other than R134a is that when the system is serviced it requires certain types of fittings, labels and dedicated equipment. By: james smith underoath; Comments: 0 . R12 and R22 are both now banned by the EPA in the United States. In addition, R134a refrigerants are not only used in auto air conditioners, they can be used in freezers, aerosol cans, and refrigerators. 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. You either get a system that will function well with R1234yf or get any other type. The approval is very legal one, governed by the U.S. EPA. I could easily be over at least 2 - 3 ounces over on the oil. What is a T/C?4. The original expansion valves work very well with R134a. So to keep things simple and to avoid controversy and politics we have R134a. evarporator, expansion valve plus flushing out the full system and replacing all the o rings. But as there's not a big difference, people say you can suffice with either. Back in that era, my business associates drove those things, brand new, and maybe I should take my Cadillac instead, no they wouldn't be caught dead in a Caddy, people of our esteem should be driving an MB. 5. . Environmental Impact: When R134a escapes into the atmosphere, it contributes to global warming. I've straightened the fans I can and sprayed simple green on it, let it soak then hosed it down well. The whole trick is to sit there in those steam boxes and not perspire, it's vulgar to perspire when driving on public roads.If you want esteem, drive an MB, if you want comfort with 60*F interiors in a 125*F environment, get a Caddy. For instance at 25 F the pressure of R-12 is 24.6 PSI and the pressure of R-134a is 22.1 PSI. R-134a can actually cool better than R-12 in a well designed R-134a system as it has better thermoconductive properties, but all the high pressure issues have to be addressed.But even when these cars were brand new, didn't cool worth a damned, recall almost dying in one in Las Vegas at the time, but a good way to lose weight with gallons of perspiration pouring out, just don't let that drip on the seats, that is inappropriate. Thanks for the input. Hopefully after you have read this entire page you will have enough information to determine which type of refrigerant is best for you. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. This would become an expensive investment for a repair or service station to have unique dedicated equipment for every type of alternative refrigerant. 30 deg is pretty coldSystems generally run between 40 and 43 deg. However, you can convert R12 to R134a by yourself, save money and keep all the tools purchased. Safety: R134a is safe to use as its non-flammable and cant explode. One of the differences between auto air conditioners that have been redesigned from R12 to R134a is that the condensers have gone from serpentine to pseudo-parallel. When I compare parts, 93 uses one part number and 94 has a different part number. If you find any of these conditions you will want to liquid flush (with dedicated AC flush solution) all the lines, condensers, evaporator (remove the expansion valve) before you proceed further. What was the ambient when you took that reading?Jumpering the aux fan is a common thing here in the desert. Thomas Jefferson, Thanks,OK, I'm starting to feel a little better about it. This chart has a column of ambient (outside) air temperatures on one side and a corresponding range of high side pressures on the other side. -------------------------"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." Though you can purchase 12 or 16 ounce cans of R134a from local retailers it is very difficult to measure out the correct amount into your system. #4. However, it was found to be a very bad gas for the environment. R12 contains a chemical called chlorine that destroys the ozone layer, thereby causing potential environmental risk. A lower GWP alternative to R-134a had to be found and thus we have the new 1234yf. The adjusted tension of this spring is the determining factor in the opening and closing of the expansion valve. This means that it has a high potential of causing depletion to the ozone layer. Paul:A 1983 240D should have a York compressor on an OEM system. Bottom line, R134a simply doesn't cool as well as R12. -------------------------"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." 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 . In cases such as this, the required capacity value of the expansion valve with R134a is reduced by 30% (correction factor 1.42). How is 1234yf different from . Since then, the industry standard has been R134a, which is an efficient replacement. The oil is spread all over your system when it is at rest. R12, on the other hand, is called chlorofluorocarbon (CFC). This refers to BTU's (heat) moved per pound of refrigerant moved. Osuagwu Solomon is a certified mechanic with over a decade of experience in the mechanic garage, and he has over five years of experience in the writing industry. I would suggest you do stay away from R-134a since with the hot gas bypass of your system (if it is to be just as the original) extremes of temperature and pressure will be very hard on your compressor and the rest of the system. Stay home and grill your own steaks and stir your own martini. The larger fitting goes on the discharge port and the smaller fitting goes on the suction line or compressor inlet / suction port. In a car ac, using this type of freon 20 years ago was difficult. R12 was once used in many air conditioning units as a refrigerant or cooling agent. It will work and there will be very little, in any difference in performance.As Chick stated, the difference is only the gas used in the sensor tube. leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . If you still find it difficult to use R134a in a home AC system, you can check out a comparison of R12 vs R134a fittings to know the refrigerant that best fits the AC system. 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. Condensers designed to release greater amounts of heat help to expel the greater amount of heat which R134a removes from the cars interior. Then when it is switched off for a few minutes and then back on, the air cools again. There are three different refrigerants officially sanctioned by the EPA for automotive usage: r-12, r-. When the temperature is reduced to-7C or below, the plants ability to cool the airdrops significantly. I had to vaccum the system for 2 hours and recharge 4 oz of PAG oil plus 36 oz of 134A freon (3 cans). I mean, really a lot. Whenever its exposed to the environment, it changes to a gas. is good, then I should be looking elsewhere? ). This may be the source of your oil confusion. R12 is highly destructive to the earths ozone layer. Its highest value is 1. I don't think it has any air dams or seals, I'll check to make sure. The system will be checked for gross leaks while under vacuum. Be sure to test @ 1500 to 2000 engine rpm, and record the ambient temp as well. But as there's not a big difference, people say you can suffice with either. These cheap kits usually have a few cans of R134a (either 12 ounce or 16 ounce), maybe an extra can of refrigerant oil, a few generic R134a charge port adapters and maybe some o-rings. If you have the work done, be sure you find a true "A/C" shop that can make up lines. Thanks again. Flushed, vacuumed etc. Accessories Pumps, Cooling Towers, Evap Condensers, etc, Components Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. Some cars have both an engine coolant temp switch & a refrigerant temp switch, others only the refrigerant switch. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. Could that be screwing up the systems performance?Anyway, when I installed the system, the new TXV (is that short for expansion valve?) I put one in my old daily driver '79 Chevy tank (r-12), and it really made a difference. At 40, it is 35psi, which is a difference of 8.9psi. At the moment, the ac is acting up - will work fine for about 15 minutes and then slowly the vent temperatures rise until the compressor switches off. $21 . A Lot of the fins are bent, especially at the top. About four or five years ago, I guy with an MB came here with the same problem, that tread was over six pages long. and feeds it through an expansion valve. What is a good differential? Then again, there are two different expansion valves. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. What is needed? The difference between R12 and r134a is the BTU carrying capability. Here are the basics for converting a system that does not have a charge of R12, its empty. _____ 2012 E350 2006 Callaway SC560 . Make sure to get the R12 EXP valve if that is the way you go. Can I use the one for the R-12? gital control scheme. I dont know why the cost difference between compressors is so huge, though. . We, the Rxmechanic team, have presented a well-detailed comparison of R134a vs. R12. A comparison between R12 vs. R134a temperature will show that R12 has a higher temperature than R134a. Is the information not applicable to the old Pantera system? The common problem when converting from R12 to R134a is lack of knowledge or equipment. Even if the system leaks, repairing the leaks and recharging it with R-12 is usually the best repair alternative.
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