Picture of Adding Freon to your automobile's Air Condtioning system
Every automobile parts store I walk in these days has freon for sale. When R-12 was around I was licensed to buy and use it. I thought that was a good thing because you can be severely injured and or do $$ of damage to the system your working on. I decided I would do this instructable for the following 2 reasons . First to help people to understand and be safe. Second to equip you to make a repair to your AC system if it just needs a Freon charge to bring it back to good working order. First a few Rules you need to always follow.
1. Since your car engine is running to charge the AC system there are moving belts and pulleys,fan(s) and very hot parts. You can easily loose your fingers if you put them where they don't belong!
2. Freon if sprayed as a liquid on your body parts will freeze them instantly- FROSTBITE
3.Don't release freon into the atmosphere. It is not good for the earth.
4.Wear safety goggles at all times incase a hose blows or something goes wrong and freon is sprayed on your face.
5. If after reading this instructable you feel unsure about doing this then you should not be doing it.
Ok lets get started.
Tools needed:
1. The adapter to connect from the freon can to your freon SUCTION SIDE of the AC system.
Found where you buy freon.
2. Freon- probably 2 cans if your system is barely cold. If it is cool but not as cold as it was buy 1 can
3. A thermometer to see the temp drop from the dash vents or cold air out.
4. An AC system in need of some freon.
PATSY0017 years ago
Not trying to be petty, however "Freon" was just a brand name used by the DuPont corporation. The appropriate term to call such substance would be "Refrigerant". The term refrigerant can refer to all the different types such as R-12, R-22, R-134a etc.(and many more). But most importantly true Freon is composed of chlorofluorocarbons.
Gort (author)  PATSY0017 years ago
Your right.
My intended audience for this was folks who wanted to get their system going but really did not understand what was going on behind the scenes. Nine times out of ten if you walk into a parts store and ask the counter guy "I need some of that stuff that makes your AC cold" The guy will say "you mean freon and its over there." Freon is the accepted street name if you will and most people recognize That name. Take a look at this big chain auto parts seller's web page and see how they identify refrigerant on their web site

PATSY001 Gort7 years ago
Yes, I see your point, but that is not right. Not even for large corporations, unless it is manufactured by DuPont, but even they don't call it that anymore. Not picking on you, but maybe someone could make a buck or two by letting DuPont know someone is "ripping off" (using without permission) their trade name. Like for example if you invented the "Gort" recharger, and someone else marketed a similar product, and called it a "Gort" ... you should get millions due to inventors rights and copyrights... but maybe now I'm just being silly. But someone out there should offer their legal services to DuPont against "un-named big name auto parts store" hint hint... if anyone does this, keep Patsy001 in mind for compensation of his idea.
kInda lIke a phillips screwdriver (crosspoint) or a frigidare (refrigerator)? we all do it. its a normal way of communication outside of the english classroom.
Gort (author)  PATSY0017 years ago
It's your idea ..have at it
BLias2 years ago
And to remove your refrigerant you have to take it to a shop they will recover it then vacuum your system out technically if you just crack the line and let it bleed out you can be facing up to a 30g fine if you get caught but a little bit escapes that's fine it's called a diminamous release
OpticHash BLias4 months ago

de minimis release and that's only for purging your lines of air and when you disconnect your hoses.

If you have a low loss fitting on the liquid line (hi side) it prevents all the liquid in your gauges from spraying out when disconnecting. You will want to open the hi side after disconnecting if you have a low loss fitting so it doesn't mess up your calibration.

Knowing venting refrigerant into the air is a $37,500 fine if your caught and a felony.

Adding to much freon is possible and actually diminishes the performance of your A/C system. There are other reasons why your A/C might not be working like either one of the coils being dirty prevents the transfer of heat. We use terms such a sub cooling and super heating in the field to determine potential causes for problems.

The Arbiter10 months ago

This is only a band-aid on a potentially worse situation. The A/C system is a closed system and the refrigerant does not wear out or go bad unless it is contaminated. If it is contaminated, then you have a leak in the system. A leak needs professional service. You can put new refrigerant in all day, and ultimately, it will become contaminated. While this seems like a nice "pat yourself on the back" situation, it ultimately could mean costlier repairs on your vehicle.

bvankuren1 year ago
I got a 2006 lariot f-150 truck I just recently added Freon to where it supposed to be at. now the ac codenser kicks on when the car is started the lines sweat cold but when u go inside the trick the air still blows hot. Any suggestions or any ideas of what could cause this? plz email me at souldriven2014@gmail.com if u can Thx.
BLias2 years ago
Don't put r134a in a 1967 car it most likely takes r12 which can be hard to come by check for a tag under the hood which it probably won't be there so try looking on the only way you could put r134a in is if you had the system updated which can be pricy and thank god for patsy001 it gets irritating here people call every refrigerant freon and and it's surprising to here someone actually know about the molecular break downs
philheflin3 years ago
How much 134A is needed in a 1967 Camaro 327? Thanks. Phil
Derin6 years ago
How would I be able to remove A/C from a car?
skunkbait7 years ago
Hey, you did a gret job on this ible. Five Stars! I was intimidated by A/C systems until a couple of years ago. I had to make a trip to New Orleans (in August!) and my Suburban's A/C had just crashed (compressor). I had one day to figure it out or burn up. Necessity is the mother of A/C repair!
Gort (author)  skunkbait7 years ago
Thanks. Good for you for not giving up and figuring it out. Don't things just pick the worst time to break?..lol
Derin Gort6 years ago
I know...the brakes on our VW failed right when we were about to go home which was 50m away...had to take it to two service stations because one didnt have the part.
Derin6 years ago
NEVER;EVER touch the fan if its not unplugged.I have seen cars that are off and still have the fan running full blast.
Gort (author) 7 years ago
As a side note you can dust talcum or baby powder onto the accumulator and then easily watch for moisture accumulation on it.
Is there a concern about accidentally putting moisture in the system when you recharge it?
Gort (author)  thematthatter7 years ago
Moisture will cause freezing of your system. Usually at the expansion valve which is where the freon escapes high pressure into low pressure through a tiny orifice. Moisture likes to freeze that orifice closed. It will unfreeze in about 10 minutes and your ac will work again. 134A boils around -15 degrees F. So its very cold at the expansion valve and that is why you don't want moisture. The oil in the compressor also likes to absorb the moisture and this can cause it to go acid over time.All AC systems have a "drier" in them. That is a powerful chemical that absorbs and holds any moisture. If you accidentally allow moisture in your system most likely there will be absolutely no problem because the drier will immediately grab it. But I wanted everyone to know the correct procedure. The quick answer to your question is don't lose any sleep over it. In my summary you noticed I stated that if after you charge your system it goes from cold to warm over and over its probably moisture. Remember that when an AC system is recharged by non pros they have no way of knowing if their system is moisture saturated or not. On older cars there was a little view window on top of the receiver / drier and if it was blue you were good if it turned pink you were moisture saturated. If you have a leak and lose ALL your freon then the drier will actually pull" outside of the system" moisture in through the leak path and saturate itself. Then when you Recharge it there is moisture mixed with freon and that is a major problem in terms of it working as it should.