Procedure for A/C Recharge
07-23-2006, 12:38 AM
#1
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Procedure for A/C Recharge
I replaced a couple O rings in one of my a/c lines and the system still wont hold a charge. a friend of mine said I had to vacuum the system first then add the r134 a? is this true?
07-23-2006, 01:19 AM
#2
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RE: Procedure for A/C Recharge
Ok do not take this wrong but this is something you should leave to a pro since it is obvious you do not know and neither does your friend. What year is your car and has it been converted to R134?? If not adding R134 will ruin your A/C system. For a R12 system yes you will need to pull vacuum first before being able to add R12 but if you do not have the proper gauges and know what the proper pressures should be you are risking serious damage to yourself and the A/C system
Richard
Richard
07-23-2006, 01:23 AM
#3
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RE: Procedure for A/C Recharge
ORIGINAL: 5.0 MPG
I replaced a couple O rings in one of my a/c lines and the system still wont hold a charge. a friend of mine said I had to vacuum the system first then add the r134 a? is this true?
I replaced a couple O rings in one of my a/c lines and the system still wont hold a charge. a friend of mine said I had to vacuum the system first then add the r134 a? is this true?
Now maybe you can tell me what I need to do to get some cold air through my vents???
Jesse
07-23-2006, 02:42 AM
#4
Yukon Cornelius
Join Date: Oct 2005
Location: deep in the heart of dixie GEORGIA
Posts: 11,808
RE: Procedure for A/C Recharge
u really need to have a vaccum pulled 28 inches of hg (mercury) its the vaccum at which water boils and evaps really should pull the vaccum for at least a good hour or more and check for a drop in vaccum if so theres a leak! then u need a proper guage to recharge
07-23-2006, 03:02 AM
#5
Join Date: Jun 2005
Posts: 25
RE: Procedure for A/C Recharge
Like it was stated above, you will need to pull a vaccuum on the system to 29. Leave it in a vaccuum for 15 minutes and see if it loses any vaccuum. If it does you have a leak, if it doesnt its good to charge. At that point you can add freon after purging the line. The system might not take enough freon by itself depending on the temp. outside. If that happens put approx 1.5 lbs in and turn the AC on. Jump the low pressure switch and it should take the rest. On the guages on a fairly hot day it should be about 250 on the high side and 40ish on the low side.
07-23-2006, 03:22 AM
#6
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RE: Procedure for A/C Recharge
thanks boys! Great info!
no wonder it wasnt holding a charge!
I have the low side on a vacuum right now, Im going to leave it there for a couple hours to be sure. If it holds can I re charge it with a can of R 134 A on just the low pressure side? Or do I need to mess with the high pressure side with something? Do I need to put the vacuum on the high side?
no wonder it wasnt holding a charge!
I have the low side on a vacuum right now, Im going to leave it there for a couple hours to be sure. If it holds can I re charge it with a can of R 134 A on just the low pressure side? Or do I need to mess with the high pressure side with something? Do I need to put the vacuum on the high side?
07-23-2006, 03:32 AM
#7
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RE: Procedure for A/C Recharge
ORIGINAL: cioccoj
Like it was stated above, you will need to pull a vaccuum on the system to 29. Leave it in a vaccuum for 15 minutes and see if it loses any vaccuum. If it does you have a leak, if it doesnt its good to charge. At that point you can add freon after purging the line. The system might not take enough freon by itself depending on the temp. outside. If that happens put approx 1.5 lbs in and turn the AC on. Jump the low pressure switch and it should take the rest. On the guages on a fairly hot day it should be about 250 on the high side and 40ish on the low side.
Like it was stated above, you will need to pull a vaccuum on the system to 29. Leave it in a vaccuum for 15 minutes and see if it loses any vaccuum. If it does you have a leak, if it doesnt its good to charge. At that point you can add freon after purging the line. The system might not take enough freon by itself depending on the temp. outside. If that happens put approx 1.5 lbs in and turn the AC on. Jump the low pressure switch and it should take the rest. On the guages on a fairly hot day it should be about 250 on the high side and 40ish on the low side.
07-23-2006, 04:17 AM
#8
3rd Gear Member
Join Date: Mar 2006
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Posts: 563
RE: Procedure for A/C Recharge
Yeah I am going to do my AC sometime this week, it hit 116 today where I live, and I worked 10hours outside... I want to get it done, except I am replacing my 3 ac lines, so maybe I don't need to do a vacuum, just gonna get an o-ring kit and replace them. Also, must I use a gauge? Seems like a lot of kits have ones without, never made sense of that.
07-23-2006, 04:53 AM
#10
Yukon Cornelius
Join Date: Oct 2005
Location: deep in the heart of dixie GEORGIA
Posts: 11,808
RE: Procedure for A/C Recharge
ORIGINAL: 5.0 MPG
how do you purge the line?
ORIGINAL: cioccoj
Like it was stated above, you will need to pull a vaccuum on the system to 29. Leave it in a vaccuum for 15 minutes and see if it loses any vaccuum. If it does you have a leak, if it doesnt its good to charge. At that point you can add freon after purging the line. The system might not take enough freon by itself depending on the temp. outside. If that happens put approx 1.5 lbs in and turn the AC on. Jump the low pressure switch and it should take the rest. On the guages on a fairly hot day it should be about 250 on the high side and 40ish on the low side.
Like it was stated above, you will need to pull a vaccuum on the system to 29. Leave it in a vaccuum for 15 minutes and see if it loses any vaccuum. If it does you have a leak, if it doesnt its good to charge. At that point you can add freon after purging the line. The system might not take enough freon by itself depending on the temp. outside. If that happens put approx 1.5 lbs in and turn the AC on. Jump the low pressure switch and it should take the rest. On the guages on a fairly hot day it should be about 250 on the high side and 40ish on the low side.