(This is the line that goes around the back of the engine and then comes underneath the radiator hose and curls in a “U” up to the accumulator. With the current EC Directive 2006/40/EC it was decided to only use refrigerants with a GWP of less than 150 in the future. I evacuate to 500 microns for 1 hr then break with dry nitrogen this process is done 3 times then final evacuation and recharge. R134a (or HFC-134a) is a non-flammable hydrofluorocarbon refrigerant that was introduced to commercial and industrial applications as an alternative to the R-12 CFC refrigerant. To tell if it has been converted you can look for a sticker on the unit under the hood, which would indicate that it is R134a. For now, I'm going to assume the specs are 40 oz. For conversion of R12 to R134a. The high port side is the one with the small hose. and R134a systems. The low side pressure in your air conditioning system should. Purchase a can of R-134a refrigerant and a charging hose with a gauge from your local auto parts store. It is a good idea to remove the compressor if possible to drain as much oil from it as possible. 6. R12, the AC works best with R12. Change the oil in the compressor, change the drier (aytime you open the system, change the drier-cheap insurance), get a couple of charge port adapters. punk_and_goth. Reply Like #7 06-20-2002, 09:57 AM rxtr. USE THIS UNIT. Install all the other components, install the adaptor fittings on the service ports. If done properly with a manifold gauge set, a known amount of ram air and an ambient temperature gauge, a professional technician can get close to the right charge. Recharge With R134a. Turns in to low pressure liquid. Use nitrogen to push the flush through. The kit includes new service port adapters, 12oz Ester oil and an assortment of R134a compatible O-rings and lube. Put on a pair of safety glasses and work gloves. 2-R134. Punch two holes in the firewall for the evaporator hoses. I am a new member that is converting my 1991 F150 AC system from R12 to 134A. When your compressor kicks on, add freon to the correct pressure. A good tip is to coat the new O-rings with 134 a refrigerant oil you have been installing in the system. – 28. Before 93 we used R-12 for our vehicles and now, as I write this article in 2018, there is a push to. In the course of this replacement it is also recommended to flush the air-conditioning system. = R134a Charge Level. People continue to call R134a Freon, but it's not the same chemical. Manifold Gauge Set R134A R502 R22 HVAC A/C Refrigeration Charging Service AC Diagnostic. R-134a first began to see widespread usage in 1992 and. The high port side is the one with the small hose. i see. Air-conditioning systems in vehicles of class M1 (passenger cars. Any good facility specializing in auto air-conditioning will typically have one of these in-house and will charge a nominal fee, if any, to check the car to identify the refrigerant. 25 lbs of R12 refrigerant. 00 Oz. Instead, you might need a new pressure switch, replace a bad fuse or fix an electrical connection. 3°C (-15. It's also not safe to use R134A in a Freon system. As an example, let’s say the R12 charge specification is listed at 2 lbs. The A/C accumulator is the refrigerant reservoir, and houses the desiccant which removes moisture in the refrigerant. R12 was used in most cars and trucks until 1995 when it was replaced with 134a. It should turn off compressor at -2C and back on about 10C. I have a 91 CRX HF that doesn't have working air conditioning. Turn the air conditioner to maximum A/C. When your compressor kicks on, add freon to the correct pressure. used to replace R12 R22 with R134A charging port 1/4" SAE or 7/16”-20UNF adapter. I don’t think a different low pressure switch will help performance. The performance of an automobile refrigeration system using R134a and an R134a/R1234yf mixture was experimentally investigated. #2 · Jun 14, 2009 you can get 134a fittings for like $4 to $7. If it's below 45 psi, there isn't enough refrigerant in the system and it. for my extended cab. Some mechanics simply fill the system up with R134a and then change. After some research and reading everyone's replys, I am going to have to get: - a new drier. 6. 9 liter A/C not working, bad compressor. 0L R134a Conversion Kit If your compressor is still in working condition this kit will give you all the necessary components to convert from R12 to R134 Receiver Drier. If you are switching to R134a buy PAG oil and fill the compressor with oil. If system has any refrigerant R12 left in the system it must be reclaimed by an approved recovery machine. A good tip is to coat the new O-rings with 134 a refrigerant oil you have been installing in the system. If the plenum temperature is below 20 C and or if the air flow is restricted the evaporator core will freeze up. Quest R-134a air conditioning retrofit & recharge kit, converts R-12 refrigerant to the new R134a, complete kit includes ( 3 ) 12oz. 78 cubic ft per pound, which is 1. R12 to R134a Conversion Kit, 1Pair R12 to R134a Convert Adapters, R12 to R134A AC Retrofit Fitting Adapter Kit, R12 to R134a Adapter Fittings, Fits for Car AC Air. when changing from 12 to 134a, you have to change the o rings in the compressor and also the oil. . When your compressor kicks on, add freon to the correct pressure. Contrary to popular belief, most cars. Ford’s most recent models, which date from 1994 to the present, employ R134a in their air conditioning systems. I bought a manifold set and A/C system flush kit off Amazon. Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system. = R-134a amount. Engine Size: 5. And the reason goes something like this; r134a is actually a more efficient refrigerant, BUT it is designed to operate at a higher pressure than r12 and an r12 compressor simply won't develop high enough. I changed out everything, but the evaporator core, which I flushed. ----If this video was hel. Tempted to convert your old car’s air conditioning system from R12 to R134a? Before you do, first things first: it’s possible your car has already been converted from R12 to R134a, and you don’t even know it. > Air Conditioning Refrigerant Capacity and Oil Type > Ford Refrigerant Capacity and Refrigerant Oil Type. That's because the molecules of R134a are smaller than Freon and can more easily leak out of the system. 34°F), and a critical temperature of 101. I have a 1991 K2500 Chevy EC pickup that I am getting ready to retrofit to R134a and I would like to know the amount of oil and refrigerant that I should put in, I am changing out all components. R22, also known as hydrochlorofluorocarbon 22 (HCFC-22), is a refrigerant responsible for absorbing and removing heat from your air conditioner, heat pump, and car air conditioning system. 1-R12. 5 °C, the COP and cooling capacity of the R134a and R134a/R1234yf refrigeration systems was found to decrease. They say if a little bit of R12 and R134A mix it shortens the life of the A/C compressor and it won't work correctly anyways. Once you find the 1993 Escort AC low pressure port cap, hook up the can of refrigerant to the low pressure port. It can be used with low-pressure air conditioning systems. Mustang; Bronco; Cougar;. Is this a good idea? Is it as simple as changing the fittings, draining the oil/remaining R12, then charging with a couple of oz of oil and r134a?On 1988 to 1992 Cadillacs, replace the low temperature sensor. I've done a static pressure test with nitrogen to 200 PSI. #19. Push the low side retrofit R134a fitting over the old fitting and use a wrench to tighten it. Vehicles using R-12 refrigerant will have to be brought to a dealer or air-conditioning shop for recharging as R-12 is no longer available to the public. The existing R12 compressor cools fine, but is extremely noisy. Typically the AC. The mixing of R-134a with R-1234yf will change refrigerant pressure and may result in evaporator freeze-up on pressure control systems, reducing system airflow. By model year 2021, all MVACs in newly-manufactured light-duty vehicles in the United States will be designed for R1234yf use. When it is compressed it retains heat, which is transferred to the exterior of the vehicle. And you can also look for R134a adapters, which. In addition to cooling, freon lubricates the compressor when it runs. Typically, in most cases, the year of vehicle will be the determining factor of which refrigerant is used. Fill the system with recommended amounts of oil, and R134a; R134a runs at higher pressure than R12; R134a will generally not cool as well as R12 on a converted, non OEM, setup; Poor People Racing - R134a conversion Proper R134a. . It's generally accepted that one cannot effectively remove. that is why I recommended buying 3 packs (about $3. Replace or restore all rubber hoses with barrier hose. We offer a wide range of fluorocarbon refrigerants. 44 inch port and one high side . install the 134a change over fittings. The IHX is integral to the low-side system plumbing and improves cooling efficiency. Disconnect ALL the lines and flush the parts with R134a to remove any excess oil. Everywhere that I go says the A/C capacity is 40 oz. It should turn off compressor at -2C and back on about 10C. total fill (three 12 oz. I have done this it requires custom. This will increase the lifespan of these O. Lexus Master Technician. 38 inch port. Of particular interest to me is:-Use of "duracool" is not allowed. cylinder. 1985-87 (C4) Corvette Air Conditioning R134A Conversion KitJust rebuilt the entire AC on my 96 from rock auto. mode and kick into ECON. Get cold air back into your vehicle. Ozone depleting refrigerant with a GWP of 10,900. Probably because it's much cheaper for them to get. Charging – Charge the A/C system with R134a to approx. mode and kick into ECON. Disconnect the large refrigerant line from the other side of the accumulator. 6 PSI and the pressure of R-134a is 22. -Replace the Accumulator. 911nut's Garage. You can just drain the system from the r12 to the 134a but you will run into the risk of the system failing cause the two refrigerants dont like each other and can become sludge over time. Check for leaks. on the low side and thus the pressure on the low side. If it is bubbling, your low. All-in-one solution – no additional tools required, 36 oz. 0. Open the engine compartment of your vehicle. 1684 posts · Joined 2013. $450 for all new parts. Pull up a chart of R-134a pressures vs ambient temperatures on the Internet and put enough more in to get to the proper pressure readings at your ambient temperature. Mowrangler. It's hard to do a detailed step by step on this. 7L that has already been converted to R134a. Subject : A/C System, Retrofitting R-12 to R-134a Model (s): All (except Fox)- Model Years 1985 to 1992. R134a and water have the same abilities to change the state but R134a can do this more rapidly and at a much lower temperature than water. Most refrigerants include a leak sealer that will seal small leaks in addition to filling the R134a freon. I will buy the Sanden SD7H15 Model No. When the pressure has dropped to a certain level, this switch activates and allows high pressure from the other side. I will also flush the system and add R134. My dads 85S blow pretty cold on 85 degree days. The most immediate is a lack of cooling power, which is caused by the fact that R134a is less thermally efficient than R12 or R12 drop in replacements. I never had to mess with the AC on my 740s and, as such, I don't know what they used from the factory. For now, I'm going to assume the specs are 40 oz. ) You will need the largest disconnect tool (white) to unhook this line. It is located right above alternator on the 92-93 car. Typically the AC recharge kit you buy will have enough capacity to add enough freon to get the AC. Fill A/C compressor with PAG oil, note fill capacity in table below. The first target was CFC refrigerants such as R-12. Most R134A gauges use quick-connects on the hoses to attach to the appropriate port. Engine oil fill capacity including the oil filter. The technician would attach a gauge to both the high and low pressure lines, measure shop temperature, outlet temperature and temperatures going into and out of the evaporator. Change or restore the filter drier. When your compressor kicks on, add freon to the correct pressure. Normally, a conversion either R12-to-R134 or R134-back-to-R12 I recommend at least 2 flushes )and if you have a real good guy he might squeeze in 3) . However, this is much more cost-effective than replacing the entire air conditioning system. I have and old set of R12 gauges, I flushed them out like I did the system and bought the r134a adapters for about 40 bucks. You may need to add or subtract a little. Start the truck and turn your air conditioning on high, and make sure the vents are open. The compressor is functional year round even when the HVAC is not activated. . From what I've read online, that's unbelievably cheap. Doing this will puncture the top of the can. Replace all the old o-rings with R134a compatible o-rings. 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. It'll have the old-style R12 plug but will work with 134. At this point open up the blue valve on your manifold to allow it to pull suction on your system. Year: 1991. It includes one low side port measuring 0. Some mixtures of air and R-134a refrigerant are combustible at elevated pres-sures. Replace any O. Re: Converting factory AC to use R134a. 4. Disconnect the lines and purge the system with air and a solvent if you have away of dispensing and catching it and drying the system with an adequate source of air. It is located right above alternator on the 92-93 car. You won't be overcharged if you watch your pressures. Join Date:. CFC-12: an Ozone-Depleting Refrigerant. Take the vehicle to a repair shop licensed for A/C work that can evacuate the system of R-12 and recover it properly. Between the age of your factory A/C system and the hassle of. And it was safe—neither poisonous to breathe, nor flammable. Since R12 is hard to come by, I've looked at converting to R134a. Here are the numbers. . Torque the fitting to 20 foot-pounds. 1991 Porsche 964 Turbo. It's got to be a lot cheaper to stick with R12. Bimrpwr. How It Works. You may need to pull up on the collar around the connector to break the seal. 0 Eng. there should be a tag on the radiator support or hood with ac capacity.