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The sixth generation BMW 3 Series Sedan F30/F31/F34 and the first first generation 4 Series Coupe F32/F33/F36. Get the latest 3 and 4 series pricing from our ordering and pricing guide sticky thread.

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  #1  
Old 06-23-2020, 09:05 AM
droost droost is offline
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Freon in 2019 430i

Hi, I have a rebuilt F33 missing the hood service details sticker. We are trying to fill up the Freon. Does anyone know how much is the right amount? And if it is 1234yf? Thanks
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Old 06-23-2020, 10:08 AM
Autoputzer Autoputzer is offline
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Fish around on newtis.info. It's an on-line version of BMW's IETM (Interactive Electronic Technical Manual).
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Old 06-23-2020, 12:28 PM
John in VA John in VA is offline
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From https://www.newtis.info/tisv2/a/en/:
https://www.newtis.info/tisv2/a/en/f...?q=refrigerant
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Old 06-23-2020, 03:00 PM
droost droost is offline
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Thank you guys. So, I ended up spending 400 to put the 1234yf Freon in the car and the A/C would turn off as soon in less than a second (hot air blows out). They ran diagnostics and the following codes came up:
FEM -
804363 Refrigerant Pressure Sensor Short Circuit To Ground

Anyone have any experience with this? I'm fearing the sensor is not connected properly. But hard to confirm that.
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Old 06-23-2020, 03:12 PM
John in VA John in VA is offline
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Could be an internal problem with the sensor, causing a short?
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Last edited by John in VA; 06-24-2020 at 04:55 AM.
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Old 06-23-2020, 07:43 PM
droost droost is offline
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I plugged in ISTA+ and was able to observe the refrigerant pressure sensor hitting a reading of 30 bar which would then shut off the compressor. The cycle kept repeating over and over every 4-6 seconds. Now just trying to learn if this means too much Freon or that the sensor is bad.

Last edited by droost; 06-24-2020 at 06:07 AM.
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Old 06-24-2020, 06:39 PM
rikwynn rikwynn is offline
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Refrigerant

You can buy small cans of 1234yf refrigerant at any NAPA store for like $32/can.

Quote:
Originally Posted by droost View Post
Thank you guys. So, I ended up spending 400 to put the 1234yf Freon in the car and the A/C would turn off as soon in less than a second (hot air blows out). They ran diagnostics and the following codes came up:
FEM -
804363 Refrigerant Pressure Sensor Short Circuit To Ground

Anyone have any experience with this? I'm fearing the sensor is not connected properly. But hard to confirm that.
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Old 06-25-2020, 02:21 AM
Michael Schott Michael Schott is online now
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Are you trying to do this yourself or are you using a quality shop? 1234yf Freon is not something to mess with. Few shops other than dealers have the proper equipment to work with this Freon. The machines are expensive and the demand as of now is low so most shops refer you to a dealer.
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Old 06-25-2020, 11:24 AM
droost droost is offline
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I took it to a repair shop that has the 1234yf machine. They performed a cycle that took about an hour. Drained the system, checked for leaks, and put 1234yf into the system. The issue i'm having is that the compressor turns on, and then turns off intermittently. INSTA shows an error code of 801224 Air Conditioning compressor: shut-down due to excess pressure in refrigerant circuit". I do observe the Refrigerant Pressure sensor hitting 30 bar. with the AC on and about 20 bar with the AC off. The shop knows this is a rebuilt car so they believe they have done all they can in refilling the AC. I'm trying to figure out if AC can be taken out to lower the pressure? if that is possible I can ask them to take some out. Or if I should just have the car taken to a hopefully a better service shop that can sort this out.
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Old 06-25-2020, 12:19 PM
CJKaz CJKaz is online now
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They should read both the low side & high side pressures. From there it is standard AC system troubleshooting. Blockage in the high side will cause the high pressure cut out: condenser, crushed tube (front end accident?), expansion device. Switch could also be faulty, the pressure gauges are key to troubleshooting. If over charged (assume they charged it by weight), the pressures will tell the story. If they have that machine, they are likely well versed in AC systems, not a tool for the novice!
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