Hope this helps. -------------------------Just another brick in the wallHad a little mule I fed him castor oil and every time he jumped the fence he fertilized the soil, The older expansion valves were filled with the refrigerant they were used with, the replacement valves (today) are filled with a different chemical to work with both refrigerants..Hope this helps-------------------------ChickEmail: Chick---------------------------------------------Freedoms just another word for nothing left to lose, I believe the optimum supercool setting will vary slightly between an expansion valve for an R12, as compared to R134a, system. You may be just fine on oil - it depends on what compressor you have & how much oil you put in.A T/C is short for Thermocouple. A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F. By: james smith underoath; Comments: 0 . 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. Agram a retevis rt22 password i bastrop county district clerk records el material que oferim als nostres webs. The system has been previously converted to R-134a. -------------------------"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." The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. Put a relay on the compressor clutch to the aux fan (I like that idea - makes a lot of sense)How does that sound? My turn to LOL - greasiesel! Heres R12 vs. R134a pressure chart. 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. Boiling Point: R134a refrigerants boiling point is -26.3C (-15.34F). 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. R12, on the other hand, is called chlorofluorocarbon (CFC). Where would I get some basic info on it, I know nothing about it. Well, I'm not sure it is 'fine' - it doesn't cool very well in 95F weather. We say generally because the vehicle manufacturer may have a formula already worked out for the R134a conversion process. 2) Frost on the Vents. Looks like a couple of things happening here1) 80's vintage Eurocars were not "meat lockers". The OEM spec is 2300 rpm @ 12.6v (engine stopped fully charged battery). Since the hose is the stock hose, you cannot tell what refrigerant is inside. 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 cure is to use the newer R134a compressors is sealing washers that are different thickness. If you have a York, and it is equipped with service valves, you can check & adjust the oil level without discharging the system. What is the refrigerant property involved that has caused this? I used a full can of evap cleaner. The newer valves and switches will work with both refrigerants. and feeds it through an expansion valve. The only difference I can imagine would be the recharge connection. Anyone know what happens when an R12 expansion valve is used in a system charged with R134A? 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? Paul:A 1983 240D should have a York compressor on an OEM system. R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. Bookmarks: Digg; del . For example, if your system originally had 36 ounces of R12 then you multiply that by .80 and you have 29 ounce of R134a. I am ordering new parts, and planning to convert my system to R-134a. They might say for instance, add 3-4 oz of oil to the compressor, 1 oz of oil for when you replace a drier, 2 oz oil for the evaporator and so on. 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. An extra half ounce? Some 1993 and older R12 systems aren't as 'compatible' as you'd think to switch over. Hot coolant migrates up through the core by convection (is that the word? This means that it has a high potential of causing depletion to the ozone layer. Expansion valves are an active device, they regulate the flow of refrigerant to the evaporator depending on evaporator temperature. Then when it is switched off for a few minutes and then back on, the air cools again. Ensure you contact a professional mechanic to do the work for you so you dont end up incurring more costs for yourself. This is due to many facts: R134a refrigerant is about 10% less efficient in moving heat than R12! SO here's my question. R134a is called tetrafluoroethane (HFC). As R134A refrigerant has different operating characteristics and pressures this valve is not necesssry. R134a is NOT less efficient than R12 Actually R134a is more efficient. So I probably put the highest suggested amount in to be safe. In sum, R12 has done more bad than good. I'm thinking of jumping the temp switch and leaving the fan on to see how it does. This can be very very expensive. Thus, when the system is running, condensing the CO2 is not a problem. R-12 - yellow R-134a - light blue R-22 - green R-402A - light brown (sand) R-402B - olive R-404A - orange R-407C - medium brown R-410A - rose R-507 - teal J Originally Posted by goldNSX. Remove the old mineral oil from the compressor by turning it upside down, side to side, and turn the front hub on the clutch assembly. Safety: R134a is safe to use as its non-flammable and cant explode. An orifice tube is just a fixed nozzle that pisses refrigerant into the evaporator without any sort of feedback. Compressor. Debug the condensor (I am a computer nerd after all!)3. That is a good thing. The sticker typically has a place to note the amount of refrigerant used, the type of oil and amount of oil, the technicians sign off or name and the date of the conversion. Nice to use new gadgets! I'm going to check the condensor is way clean too. CR4P). It's actually a reaction with chlorine in the mineral oil that may have been absorbed and leftover from the old R-12. Refrigerators generally utilize R22, R32, or 410A-based coolants as their cooling agent. What is needed? I have the original (R12) style expansion valve in the Maverick AC system. R12 is highly destructive to the earths ozone layer. R12, on the other hand, has an ozone depletion potential of 1, implying that it can damage the ozone layer. By using a black light the dye will glow in areas where oil leaks are visible. Do a pre-inspection and then Evacuate (vacuum down) the system, the longer the evacuation the better but there is a point of diminishing return, 2-3 hours is generally very good. Make sure to wear safety gloves, goggles, and shoes when theres a possibility of exposure to the chemical (R134a). Any ideas from the info above? Some cars have both an engine coolant temp switch & a refrigerant temp switch, others only the refrigerant switch. The difference between R12 and r134a is the BTU carrying capability. The old compressor used R12 and the new unit will be R134a. The system will be checked for gross leaks while under vacuum. A/C systems designed to use R-12 will cool best when charged with R-12 refrigerant. 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. How dumb!I will jumper the aux fan and redo the test. Generally this works well for the whole system. Carefully study the chart and compare the following: To a large extent, the choice is up to you. difference between r12 and r134a expansion valve. R134a is called tetrafluoroethane (HFC). The catalytic converter is an essential component of your car's emission system that helps save the environment from harmful emissions. The only mechanical differences between an R12 system and an R134a system are that R134a systems typically have larger condensers and more powerful compressors. Its chemical symbol is CCl2F2. Make sure to get the R12 EXP valve if that is the way you go. I mean, really a lot. 3 ounces? look at the difference! difference between r12 and r134a expansion valve. The only material difference between automotive A/C and a window A/C unit or refrigerator is that in the home application, the components are all inside the same rectangular box, but in the automotive application, the components are distributed throughout the car. 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. Quick View. You'll want the expansion valve matched to whatever refrigerant you're using. But, if your old compressor has lock-up or if your current expansion valve is not functional it would wise to replace the expansion valve with a valve designed for R134a. don't know enough about the subject to explain the choices.However, a few days ago I called the dealer to see about an OEM TEV and they said something that made me feel a little bit better; the same part number superceded every application back to the '60s, and that they couldn't do that without engineering signing off on it.Still, I would feel a lot better if I could see something written officially that compared the flow characteristics and performance of r12 and 134a TEVs are concluded that they were interchangeable in automotive applications.If someone knows of such a document I would sleep much better!Walt Edited: Mon September 12, 2005 at 8:13 PM by wamcneil. Its chemical symbol is CH2FCF3. Once you have replaced the OEM condensor with a PF unit, you will need to make custom hoses to mate with your OEM system. 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. When I compare parts, 93 uses one part number and 94 has a different part number. The major reason for the replacement of R12 with R134a was to curb future greenhouse effects. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. Took me a while to figure that one out, and how to say that. Thus, when the system is running, condensing the CO2 is not a problem. #13. Comparatively, larger R134a molecules should take more space, and a smaller amount might be required. Also, since R134a uses synthetic oil, it has a low global warming potential, unlike R12 which uses mineral oil which poses a negative environmental impact. The bad thing is I don't know what to do about it. Recharge the compressor with a/c ester oil and a tracer dye. There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. shown for the parallel flow, aluminum condenser that is listed. 37 in 2005 tacoma, R134A. You do not have to split up the 5-6 oz of oil and add it to each component, just simply put it all in the compressor as it will move throughout the whole system once the system is operational. Use a strong surfactant like Simple Green or Zep Citrus, and soak the fins on the condensor. R12 systems used mineral oil, but unfortunately mineral oil doesn't dissolve in R134a. Usually, mechanics charge around $200 for conversion. Mark Baker R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. Look at where the lines will end up. This may be the source of your oil confusion. Ask Our Pros-Owner Assistance - NO DIY advice will be given. Plus, not releasing the chemical into the air is morally justifiable. Therefore, the higher the factor of the chemical (compound), the greater its effect on global warming. A Lot of the fins are bent, especially at the top. El juny de 2017, el mateix grup va decidir crear un web deDoctor Who amb el mateix objectiu. Only show this user. Be sure to test @ 1500 to 2000 engine rpm, and record the ambient temp as well. Pray I can let some oil out of the compressor without losing my precious R12.

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