Privacy Statement - The concern with charging as a liquid is that you'll load up the compressor with liquid refrigerant (it's supposed to enter the compressor as a gas) and "slug" the compressor which can lead to compressor failure. Ok on the Vac pump. Fine. If you charged as a vapor you will need to dump the charge evacuate and recharge from a new can to get the proper ballance of the elements. Remember, those are weights, NOT fluid ounces! As to the refrigerant left in the hose, the hose should be purged of all air prior to charging the system to avoid introducing any contaminants into the system, so you just measure the amount that actually goes into the system after purging the hose. I can't really say which # is correct but, I would start with the 42oz & see how it works. If your low side will not come up with the proper charge you could have a plugged fixed feed office. I've been doing automotive A/C work for over 20 years and I've never heard of a theory about the refrigerant's elements "separating". If I'm just adding I slowly add into the suction side as a liquid with the a/c running but it had to be slow. Did you first use a Evac Pump before recharging your system? Not a single answer. Might not be the most logical way about going about it, but it works for me over trying to do it in the mid-day 110 F temps. Use a scale to measure how much you put in! Being a old refrigeration guy but not auto I won't charge a system without having both high and low side gauges on and my refrigeration scale to weigh in the charge. I've been doing automotive A/C work for over 20 years and I've never heard of a theory about the refrigerant's elements "separating". Terms of Service - Do Not Sell My Personal Information -, By logging into your account, you agree to our. When charging have the a/c set on max so your not mixing outside air and the fan on high. Since the low pressure inlet is usually in the accumulator, one can usually "dump" in some liquid and wait a bit for it to to be drawn out as a gas into the compressor before repeating. Once again not being an expert on this whole AC stuff and not trying to rule out any other possible issue. When charging have the a/c set on max so your not mixing outside air and the fan on high. Open the low-pressure valve on the manifold gauge set and allow refrigerant to enter the A/C system. Archive - R134A is a blended gas so it has to be charged as a liquid not vapor because the different elements of the gas separate when they expand and will not combine back together until they are compressed and condensed back into a liquid. 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I just replaced the evaporator core in my '99 F250, charged the system with the 40oz that is on the sticker on the radiator support, and the coldest I've seen out of the vent is 48* and it's only 75* outside today. It's simply changing phases between its gas and liquid states and absorbing or releasing BTUs in the process. Contact Us - If you charged as a vapor you will need to dump the charge evacuate and recharge from a new can to get the proper ballance of the elements. Getting ready to replace the R-134a refrigerant in my a/c system. Approximate dry fill capacity. Actual amount may vary during fluid changes. 8oz (40 oz) of R-134a. Watch your high side gauge to make sure it's not getting over 200, the low side should settle around 30 to 35. However, for someone who doesn't know what they're doing, charging as a gas is always recommended (read the instructions on the can, they assume a novice) as that avoids the risks associated with liquid charging. If you high side gauge gets to high you either have a overcharge, dirty condenser or not moving enough air through the condenser. 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About Us - If I have to recharge my system, I like to do it when it is the most coolest outside like in the early morning. If I'm just adding I slowly add into the suction side as a liquid with the a/c running but it had to be slow. Being a old refrigeration guy but not auto I won't charge a system without having both high and low side gauges on and my refrigeration scale to weigh in the charge. Did you ever find a definite answer to this? Only qualified personnel should service the air conditioning refrigerant system. Getting ready to replace the R-134a refrigerant in my a/c system. 8oz (40 oz) of R-134a. Watch your high side gauge to make sure it's not getting over 200, the low side should settle around 30 to 35. If you high side gauge gets to high you either have a overcharge, dirty condenser or not moving enough air through the condenser. How much of the stuff should I spend money on? I have noticed in my own experiences that by slightly over charging my AC system it will not cool down to the 38-40 F. Also the outside ambient temp plays a factor in correctly adjusting for the right amount of Freon in the system for it to cool correctly. So I checked the underhood sticker for refrigerant capacity, and it tells me 2lb. The concern with charging as a liquid is that you'll load up the compressor with liquid refrigerant (it's supposed to enter the compressor as a gas) and "slug" the compressor which can lead to compressor failure. However, for someone who doesn't know what they're doing, charging as a gas is always recommended (read the instructions on the can, they assume a novice) as that avoids the risks associated with liquid charging. Since the low pressure inlet is usually in the accumulator, one can usually "dump" in some liquid and wait a bit for it to to be drawn out as a gas into the compressor before repeating. R134A is a blended gas so it has to be charged as a liquid not vapor because the different elements of the gas separate when they expand and will not combine back together until they are compressed and condensed back into a liquid. A little hint on what to look for when getting close to full charge, the suction line coming out of the firewall will start to sweat and be beer can cold. I sort of asked the same question in another thread. So I checked the underhood sticker for refrigerant capacity, and it tells me 2lb. Opening the air conditioning refrigerant system can cause personal injury. Fine. Cookie Policy - Advertising - The air conditioning refrigerant system contains refrigerant under high pressure. If your low side will not come up with the proper charge you could have a plugged fixed feed office. It's simply changing phases between its gas and liquid states and absorbing or releasing BTUs in the process.

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