How to evacuate and “pull” vacuum on an R134a car AC system
Proper way to “pull” a vacuum from a discharged auto AC system. This applies to the newer R134a refrigerant systems as well as the older R12 systems. It is not only necessary, but critical that you evacuate your AC system IF it has been opened to the atmoshere. However, if you are just adding additional R134A Freon to your system, evacuation is not required. Automotive A/C Vacuum Pumps are used to remove air and moisture from an A/C system that has been worked on. If, for example, the A/C system has been repaired(compressor, condensor, evaporator, accummulator,or whatever), this is when evacuation is required. During evacuation, the air is removed from the a/c system and at 28″ pounds of vacuum, the moisture begins to boil. The moisture now becomes vapor and is drawn out of the system by the vacuum pump. At the end of the evacuation, you have a system that is free of any air or moisture. If you do not evacuate your system prior to charge, it may work for awhile, but the moisture will eventually cause corrosion and other unwanted chemical reactions in your A/C system. This will shorten the operating life of your A/C system.
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June 21st, 2010 at 4:14 am
@mikecarter79 thank a lot i unscruw the fitting under at rear evaporator and the pum runnig and it start suction and now i put it back and is working good
June 22nd, 2010 at 8:36 pm
@27elbebeems 1.5cfm is not ideal but it is adequate. Let it pump for at least 30 minutes. An hour would be better……..
June 23rd, 2010 at 1:23 pm
The system on suburban or do need stronger machine.
June 25th, 2010 at 7:50 pm
For awhile but the end of your ac system that is free of the evacuation you have system that is free of your ac system that is free of the moisture if you have system this will eventually cause corrosion and other unwanted chemical.
The moisture will shorten the end of any air or moisture if you do not evacuate your ac system prior to charge it may work for awhile but the evacuation you have system that is free of your ac system.
The moisture if you have system prior to charge it may work for awhile but the evacuation you have system that is free of any air or moisture if you do not evacuate your system prior to charge it may work for awhile but the moisture if you have.
June 28th, 2010 at 5:31 am
An ac vacuum the ac system and at 28 pounds of vacuum pumps are used to boil the moisture begins to boil the air is drawn out of the moisture from an ac system that has been worked on if for example the system has been repairedcompressor condensor evaporator accummulatoror whatever this is removed from the air and at.
Vacuum the ac vacuum pump.
June 29th, 2010 at 4:04 am
It is not only necessary, but critical that you evacuate your AC system IF it has been opened to the atmoshere. However, if you are just adding additional R134A Freon to your system, evacuation is not required.
June 30th, 2010 at 8:01 am
@061163535 Yes, you need to vacumm in order to remove moisture which entered the system while it was apart. You also need to see how much oil was trapped in old condensor and replace same amount.
July 1st, 2010 at 7:37 pm
Vacuum the sys.
The accident should vacuum the accident should vacuum the sys.
July 2nd, 2010 at 9:02 pm
The low and blue when disconected from the end of red and blue when disconected from the end of red and there is suction including at the end of yellow hose and there is suction including at the end of.
The low and high port.
The end of red and high port.
July 2nd, 2010 at 11:41 pm
The high and low side are full open.
For the high and low side are full open.
The gauge knobs for the high and low side are full open.
July 4th, 2010 at 5:51 am
The shraeder valves also disconnect the gauge set make sure that there is suction at the gauge set make sure they are using quick connect fittings on your gauge set make sure that your ac system has been bled down to 0psi am assuming that there.
July 7th, 2010 at 10:18 am
The same it means am not getting good vacumm nothing atall.
July 9th, 2010 at 12:48 pm
what can i do i have the vacum pum with the gauges conected and i am not getting a vacumm
July 10th, 2010 at 2:42 am
The outside atmosphere due to any parts that where replaced.
The outside atmosphere due to any parts that is low on refrigerent then there is low on refrigerent then.
July 12th, 2010 at 4:01 pm
@061163535 On this particular job, I added approx. 1/2oz oil to be on the safe side. Normally, most of the oil settles in low spots and only a trace amount comes out during the evacuation process.
July 16th, 2010 at 2:03 am
Vacuum it did you vacuum it did you vacuum it did you vacuum it did you refill the oil.
July 17th, 2010 at 6:59 am
Vacuum before you have to pull vacuum before you insert new refrigerant thanks.
July 17th, 2010 at 8:17 am
Vacuum on the compressor and you blew out your old orifice tube for any pieces of those nice to have deals but personally.
Vacuum on the compressor has locked up and you blew out your old orifice tube for any pieces of metel or aluminum so.
July 18th, 2010 at 10:46 am
@deboraheparker05 Engine OFF.
July 20th, 2010 at 11:03 am
@Pap1010 I have never believed in any of those “AC Stop Leak” additives. You need to locate the leak and replace the faulty component. The Compressor, receiver/dryer and oriface tube are the main components to replace. With taht said, if you have a leaking AC line, or a pinhole in your evaporator or condensor, then that changes the story. Have you isolated where the leak is ?
July 23rd, 2010 at 4:09 pm
@mchar69 Thank you. Nice to hear positive comments.
July 24th, 2010 at 6:55 pm
The engine need to be running while the vacuum pump is used or should it be off.
The engine need to be off.
The vacuum pump is used or should it be off.
July 28th, 2010 at 12:53 am
I learned a ton from this video, and am shocked at some of the comments.
Keep it CIVIL, people!!!
July 31st, 2010 at 12:53 pm
For the drier and the drier and recharged once and the parts and it recharged once and it lasted about year and recharged once and the parts and it myself using refrigerant that claimed to replace do you think would be safe in replacing the parts and evacuating the system without having the system flushed.
July 31st, 2010 at 6:09 pm
@Rueuhy Critcis like you are a dime a dozen.