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Old Jun 21, 2007 | 02:19 PM
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Default Air Conditioning

Anyone know which fitting on the AC line is the 'low pressure' .

There are two fittings, one on the upper line and one somewhere on the lower. Anyone know which one you charge at ? If so, where is it located...... MAny thanks.
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Old Jun 21, 2007 | 03:14 PM
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The low pressure connection is always on the larger diameter line. It's the one that sweats when the ac is running. On the C6 it is near the side of the battery. The high pressure line is closer to the radiator and condenser.
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Old Jun 21, 2007 | 03:17 PM
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the smaller fitting is always the low side as far as I know.
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Old Jun 21, 2007 | 05:28 PM
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Thanks all. Found teh leak (rock put a hole in the condensor )

Ordered a new conddensor. Gonna re-charge teh system myself. Any advice from anyone who has done it?

I know I need a vacuum kit (5.00 at harbor freight) and the gauges, shoudl I use the refrig w/oil or the green dye in it?
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Old Jun 21, 2007 | 06:17 PM
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The manual says to add 2 oz of GM PAG oil for condenser replacement and 1.4lbs of R134A refrigerant total system charge. I'm not a fan of adding dyes some can react with the oil. And give the system a good pump down with the vacuum pump.
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Old Jun 21, 2007 | 10:08 PM
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Originally Posted by LOS ANGELES PI
Thanks all. Found teh leak (rock put a hole in the condensor )

Ordered a new conddensor. Gonna re-charge teh system myself. Any advice from anyone who has done it?

I know I need a vacuum kit (5.00 at harbor freight) and the gauges, shoudl I use the refrig w/oil or the green dye in it?
What kind of vacuum kit are you buying for $5. The pumps my company use cost $1,000 each.
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Old Jun 21, 2007 | 11:13 PM
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Originally Posted by saplumr
What kind of vacuum kit are you buying for $5. The pumps my company use cost $1,000 each.
It's probably one of those little venturi ones you hook up to your air compressor. I'm not a big fan of those, really can't pull a good hard vacuum. See if you can borrow a good vacuum pump. However, if you are stuck with the $5 one, pull a vacuum, add a can of freon, then pull a vacuum again. You'll get most of the air out that way.

One more thing, make sure you purge all the air out of your gage lines before you open the system.
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Old Jun 22, 2007 | 12:02 AM
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Originally Posted by LOS ANGELES PI
Thanks all. Found teh leak (rock put a hole in the condensor )

Ordered a new conddensor. Gonna re-charge teh system myself. Any advice from anyone who has done it?

I know I need a vacuum kit (5.00 at harbor freight) and the gauges, shoudl I use the refrig w/oil or the green dye in it?
It has been a while but:
1.) insure that no foreign objects have entered the system
2.) suck the system down (about 30 minutes) then insure it holds vacuum for 30 minutes before recharging.
3.) only replace the same amount of oil that you found in the old condenser
4.) the high & low pressure reading will vary according to the ambient temperature when recharging do not over fill.

Our system can utilize either refrig w/oil or the green dye
I hope this helps good luck
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Old Jun 22, 2007 | 11:18 AM
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Not trying to be a wise guy here, but if you got to ask these kinds of questions let someone who knows the subject well do it.
This is not a good area for on the job trainning.

I have worked on my share of AC systems from car size to very large buildings.
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Old Jun 22, 2007 | 11:49 AM
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Originally Posted by 6spdC6
Not trying to be a wise guy here, but if you got to ask these kinds of questions let someone who knows the subject well do it.
This is not a good area for on the job trainning.

I have worked on my share of AC systems from car size to very large buildings.
Well, sorry us amateurs have hurt your feelings, pal.

Dont worry, none of us are trying to compete with you. Your proffession is safe.

Last edited by LOS ANGELES PI; Jun 22, 2007 at 11:53 AM.
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Old Jun 22, 2007 | 12:06 PM
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Originally Posted by LOS ANGELES PI
Well, sorry us amateurs have hurt your feelings, pal.

Dont worry, none of us are trying to compete with you. Your proffession is safe.
five years retired. Not a problem. Just trying to save you some potential problems

As a welder and serious gun buff I have noticed by what questions a person asks. Sometimes you kinda figure by what is said perhaps its better off letting someonel else do it.
Like I said was not trying to be a wiseguy. Go for it.
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