bleeding the A/C - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-13-2004, 06:56 PM   #1
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When I changed the bearing on the A/C compressor I pulled it right out... thus allowing air into the system.. I read one of the links in regards to air, and water and all that.. but I want to know how do you suck the air out of the A/C system cause mine was opened? I've added freon back in.. but just doesn't seem to get cold @ all.. on a 65F outdoor night temp it would only get as cold as 55F ( good ol lazer temp gun ). I think it'* caused by air in the system.. but also read the heater core cleaning procedure in techinfo.. do you think that would help and if so if I should do that first before tryin to re-bleed and re-fill the freon?? ( As the freon isn't cheap or legal to do on your own up here )
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Old 05-13-2004, 07:07 PM   #2
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There are a few issues here. First, you're not supposed to vent it to the atmosphere. Second, you have to draw a vacuum on the system for 30-45 minutes, then shut it off and see if the vacuum holds (no leaks). Then when recharging you have to charge the right amount of refrigerant and oil together.

It is probably worth your money to have a professional A/C shop do it.
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Old 05-13-2004, 07:27 PM   #3
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30-45min??? Thats my problem there.. I had it hooked on a compressor ( backwards so it'* suckin air ) for only 10-15min.. have any idea how much it would be?? From the Canadian folks as it seems you can still buy Freon in the States for backyard mechanics?? Whereas Canada we can't
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Old 05-14-2004, 12:54 AM   #4
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You have to pull quite a bit of vacuum. 28-29 inches, or 711-737 mm.
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Old 05-14-2004, 01:35 AM   #5
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actually, freon(r-12) is only available to mechanics. we can get 134-a which is what your car should have in it already. They dont allow that sales in Canada? Hmmm.
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Old 05-14-2004, 08:51 AM   #6
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R12 is available to everyone....ebay!
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Old 05-14-2004, 11:06 AM   #7
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Quote:
Originally Posted by vital49
R12 is available to everyone....ebay!
Thats before Canada customs gets to it..

Nope.. no freon @ all.. you have to bring your car into the shop for it.. and they rip you of your first born when they're done just chargeing your unit or say you have to replace everything ( even though it'* not broken.. they'll break it )
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Old 05-14-2004, 02:12 PM   #8
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Time for a road trip to the USA.
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Old 05-14-2004, 03:24 PM   #9
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Quote:
Originally Posted by fuddyduddy121
Time for a road trip to the USA.
Well Fuddyduddybuddy.. again.. customs.. unless someone lives near border and I do it there.. which means hopefully they have all the tools. Well.. there'* still some Freon left in Tamara'* dad tank.. so I guess I just have to be extra nice to him to see if he can part some freon
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Old 05-14-2004, 06:23 PM   #10
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You would have saved yourself a world of problems if you had a shop do this. First off, they would have pulled the clutch in-situ. Even if they had to take the compressor off (which they shouldn't anyway) they would recover the freon that was in there and do the necessary work. The machine that most AC shops have are automatic. Automatically recovers and filters the freon, evacuates and does a timed leak test and then refills the system with the filtered freon to the correct level. All with a few buttons. This way there is absolutely no escape of freon to the atmosphere and the old freon is recycled (thus saving money as well). In Canada we have a course that we must take as mechanics before we can work on AC. It is called the ODS (ozone depleteing substance) course. This educates technicians on mainly environmental issues. Even though R134 is not an ozone depleting substance (like R12) it is still quite harmfull in regards to greenhouse gases (just look at TO in the summer!!). If I were to do what you did, I would be facing a potential fine of $10,000. The shop could be fined $100,000. Please I beg of people not to release freon into the atmosphere, it stays with us up to 70 years!!!! (not to mention against the law) Let the professionals do this work and yes it does cost alot to do but find a shop that you trust through word of mouth. Just a note but when I did pretty much any AC work, the bill usually came out to between $400 - $700 dollars. Mine is not working right now but I am not going to just dump a fresh batch of freon into a system I know is leaking.
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