Yes, this was a smokers car. asia pacific stevie awards 2021. gin, amaretto cocktail. J.Harris said: Or if you want to do it like they do in Mexico you can use propane, it's an excellent refrigerant but highly flammable. If not, you just don't know unless a test is performed. Break out the new gauges and measure hi and lo at 1500rpm, and do the Merc FSM test to see how we're doing performance wise. Replacement expansion valve for R134a or R12 A/C refrigerants, with O-ring connections. R134a has a smaller molecule than R12 so R134a will leak out sooner than R12. So I probably put the highest suggested amount in to be safe. Compared with the cost-performance ratio, R507 is 30-40% . Flushed, vacuumed etc. A discussion of the relationship between valve capacities and superheat set-tings can be found in Bulletin 10-9. The reason is that the vehicles, for instance, manufactured currently configure the engine for R1234yf refrigerant, making no provision for replacement. Mark Baker R-401b is the mixture by weight of 61% R22, 11% R-152a and 28% of R-124. Rules governing changing from the former to the latter differ between countries. The mechanical fan & clutch should be checked as well. Like say half a can or so recharge come springtime warm weather or something. Super heats are so close, it should not be a major concern.-------------------------The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government. Besides, you have a greaseisel. The larger fitting goes on the discharge port and the smaller fitting goes on the suction line or compressor inlet / suction port. And by matching the correct amount of R134a to use in a given vehicle, correcting the superheat of the expansion valve (if necessary), you can in some manner nearly balance or match the amount of heat drawn out by the evaporator and released by the condenser. The aux fan didn't switch on though and I didn't check the high side temperature. I don't think it has any air dams or seals, I'll check to make sure. . There are two hoses listed, R-12 64-53-1-377-821 for $72.50, and R-134a 64-53-8-391-051 fro $262.50. 1) Look Here at the available sizes of PF condensors.2) Go look at your vehicle's condensor & mounting. -------------------------1983 Mercedes 240D on R12 and WVO!1192 Mercedes 300D 2.5 R134a1993 Toyota Pickup converted to R134a. You can use this space to go into a little more detail about your company. All fans must work at 100% of the OEM rating. With new R12 no longer being manufactured, the market price soared to $100/pound. It won't be optimal, though. What effect would it have on performance, if any? Thread starter goldNSX; Start date 1 August 2009; Tagged . Big . and recharged with mineral oil and 2.2 lbs R12. 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. Below are the major differences between R134a and R12: The chemical composition of R12 and R134a differ. This means that it has a high potential of causing depletion to the ozone layer. Ensure you contact a professional mechanic to do the work for you so you dont end up incurring more costs for yourself. 10,000BTU conduction heating? So, instead of using R12, other better options include R401b, R134a, R401a, etc. Recomanem consultar les pgines web de Xarxa Catal per veure tota la nostra oferta. The cost of recharging the air conditioner is between $150 to $500. Some cars have both an engine coolant temp switch & a refrigerant temp switch, others only the refrigerant switch. system of 0.33 TR and refrigerant used was R12. Skin contact: If the R134a (liquid) comes in contact with your skin, it could cause a burn. In large application systems, the vapor density of this refrigerant is usually high. 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. In most cases, the systems used have varied components, designs, and service ports. The general practice of charging the system with 15% less refrigerant adds to the thermal deficiency of R134a. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Therefore, the higher the factor of the chemical (compound), the greater its effect on global warming. It is a haloalkane and hydrofluorocarbon (HFC) refrigerant that has thermodynamic properties, potential global warming for one hundred years, and insignificant ozone depletion. The higher the ambient temperature the higher the high side pressure. #13. Its chemical symbol is CCl2F2. What is needed? The catalytic converter is an essential component of your car's emission system that helps save the environment from harmful emissions. R134a systems operate at higher discharge-side pressures than R12, which can cause compressor seals to leak. . It is possible I have 10 ounces (250 ml) in the system. You can also check the Aux fan in your case. The original expansion valves work very well with R134a. A capacity curve is shown in figure 2 for relative capacity of R134a vs. R12 for evaporating temperatures from 0F to 50F. Table 1 summarizes the technical characteristics of three potential R134a alternatives. Hence, let us continue to fix it. This refers to BTU's (heat) moved per pound of refrigerant moved. difference between r12 and r134a expansion valve. It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines. 2001-2023 Griffiths Technical Inc. All Rights Reserved. Even though their common major function is to cool the system, they have many differences. 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. video clubhouse baseball; nick fairley draft profile; ben davis work pants It is common for eurocar threads to go multiple pages, and as Nick points out - sometimes cool is all you will ever get. Consider using the newer valve, even with 134a stamped on the valve. But as there's not a big difference, people say you can suffice with either. The Main change in the system is the expansion valve. It was later found that R-134a had a very high Global Warming Potential, or GWP, number. R134a requires the use of synthetic oil! I don't want to be chasing ghosts. ing the expansion valve, a maximum opening superheat of 7F, and a standard factory air test superheat setting. This allows the refrigerant in the condenser to be void of oil particles. That is a good thing. 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. The car never overheats, if that has any import. 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. in /nfs/c05/h04/mnt/113983/domains/toragrafix.com/html/wp-content . R12 was once used in many air conditioning units as a refrigerant or cooling agent. R134a compressors are substituted as new to retrofit the R12 system compressor part numbers with different height sealing washers. Its duty is to convert toxic gasses produced by the engine into A brake cleaner is a powerful solvent for cleaning dirt from the brakes and other car components. 34 in 70 series w/ R12 in 100+ Tucson, AZ summer heat w/ hd-t, w/ 13B-T is was unbearable about 31 at vent w/ R12. absorb by the evaporator to insure all liquid refrigerant entering the evaporator. I'll report back on the aux fan on performance next. Ask Our Pros-Owner Assistance - NO DIY advice will be given. I have some experience with auto a/c but not too much. difference between r12 and r134a expansion valvewarning signs for a deteriorating patient with covid 19 infection 2022.07.03 18:36 18:36 bokoen1 hoi4 the great purge / meryl and maks dancing with the stars / difference between r12 and r134a expansion valve. I have the original (R12) style expansion valve in the Maverick AC system. The best replacement for R134a is R1234yf, while R12 refrigerant replacement was R134a. In the automotive world, the replacement for R12 was R134a. It is made up of carbon, hydrogen, and fluorine. El juny de 2017, el mateix grup va decidir crear un web deDoctor Who amb el mateix objectiu. Why wait for 200f on the engine coolant to start the fan? We ALWAYS want to know the pressure readings! R134a and R12 are both refrigerants used in vehicle air conditioning systems. . Make sure visiually that no large gaps exist that would allow the air to bypass the condensor on the way to the radiator.B. A. Pressure/temperature plot of R134a vs. R12 is shown in figure 1. Unfortunately, the R12 refrigerant doesnt always blow cold air. leading to corrosion of expansion valves, capillary tube plugging, and compressor bearing . It won't be optimal, though. This drop can affect energy consumption since the plant will operate for a longer period or a larger plant will have to be installed. compressor, condenser, evaporator and expansion valve are specifically designed for use with R134a. Make sure to get the R12 EXP valve if that is the way you go. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Is there a difference between a R134a expansion valve and an R12 TXV? R134a is called tetrafluoroethane (HFC). Below are the major differences between R134a and R12: Chemistry The chemical composition of R12 and R134a differ. Unfortunately, the oil only mixes with the refrigerant as a liquid. Therefore, the R12 refrigerant is illegal, and emitting it is illegal. Replied by Rich928 on topic R12 or R134a. Blows pretty hard on full. Before landing on the debate of R134 vs R12 you should know that both R134a and R12 are AC refrigerants types used in refrigeration and air conditioning systems. A good T/C, clamped to the line & insulated gives a repeatable measurement of the tube. 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. The R134a compressor has a 1/8" step in on the high side port. Helical and Serpentine coils. Then again, there are two different expansion valves. ~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446. Pound for pound R134a is a more efficient refrigerant than R12, however it runs at higher pressures in some aspects and therefore requires more effective condensing. Nice to use new gadgets! To ensure the right charge, you must fill the new system with between 75 and 85% of the factory-set capacity for optimal cooling. What is usually sniffed are all the connections in the system: hoses and compressor, condenser, drier, expansion valve and evaporator fittings. The oil used in R12 systems is not compatible with R134a refrigerant. 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. R-12 is no longer used or produced in many countries and remaining quantities have skyrocketed in price. Answer: OK, I'll bite. The only difference I can imagine would be the recharge connection. The money you will save by will pay for the R12. Talk about what services you provide. You either get a system that will function well with R1234yf or get any other type. 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. 05-25-2017 02:14 AM. R134a requires a different oil. Bad Car A/C Expansion Valve Symptoms. In practice this means that the car can overheat and the aux fan will stay off! 4 Stars & Up & Up; 3 Stars & Up & Up; 2 Stars & Up . I have one can left, so maybe a plan can be made. 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. The global warming potential of R134a is 1430. 2) Frost on the Vents. 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. I dont know why the cost difference between compressors is so huge, though. R1234yf is more environmentally friendly and has a global warming potential of 4. Paul:A 1983 240D should have a York compressor on an OEM system. AFAIK, there is no clutch on the engine fan on the 240D. 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. It didn't seem too dirty though - I don't think it is the problem, but I could be wrong. The pressure/temperature curves for R-1234yf and R-134a are very similar. Looks like a couple of things happening here1) 80's vintage Eurocars were not "meat lockers". It can be used applications like walk-in coolers, food and dairy display cases, domestic refrigerators, and beverage dispensers and vending machines.