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Old 01-16-2012, 09:08 AM   #1
mmiller2002
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Default AC work - can I replace an o-ring myself?

I believe that I have a leaking o-ring where the high pressure hose connects to the compressor, right on top. I hear it hiss, and I see some fluid. I've tried tightening.

If I get the o-ring, can I just unbolt the hose, replace the o-ring, and bolt it back on, then use a DIY R134a recharge kit? Or, is the system hosed once I expose it to the atmosphere?

Thanks,
Mike
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Old 01-16-2012, 01:24 PM   #2
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Technically, you'd want a shop to do this to purge the system of freon, install the o-ring, vacuum the system, the refill.

A hillbilly would pop the line, lube and replace the o-ring, then reinstall the line and use a kit to recharge. Problem with this is its not eco-friendly and you could get water/air into the system which could cause more expensive problems.

A hightech redneck would do option 2, then have a shop drain, vacuum, and refill the system with their machine saving the cost of the o-ring replacement.

Yer call....
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Old 01-23-2012, 03:27 PM   #3
mmiller2002
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OK, got the o-ring replaced, and system evacuated, but tech didn't have enough R134a to recharge (ugh!) so I got a couple 12oz. cans and a 6 oz. can of oil/booster and I already had a DIY single gauge and hose from a previous kit.

Anyway, put in one can and most of the oil/booster and it seems cool and the gauge reads in the green. How do I know if I need to tap the second can of R134a? Any harm being done if it's a little low?

Thanks
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Old 01-23-2012, 03:32 PM   #4
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You can't guess at this. Have someone who knows what they are doing put a real set of manifold gauges on it.
You also can't just throw more oil in the system, there is a specific amount that needs to be added depending on what was done. If there was only a small leak with minimal oil loss, and no major components of the system were replaced, not much if any will need to be added.
Yes the system may work in the short term and blow cold air, but if not serviced properly there could be issues later on.
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Old 01-23-2012, 09:06 PM   #5
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forget the oil/booster....dont do it!!!!

trust me onj this....just put the freon back in and done


doh...too late
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Old 01-24-2012, 08:52 AM   #6
mmiller2002
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The system was totally low due to the leak. Low pressure switch wouldn't let the compressor come on. Then, as i said, I had it evacuated.

But, I do have a friend with a set of gauges, so i guess that's next...

Thanks for the advice
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Old 04-15-2014, 10:57 AM   #7
ZondaF
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Resurrecting - any suggestions on an o-ring assortment? How about -
http://www.harborfreight.com/205-pie...kit-67644.html

SAE vs metric measurements? Nitrile vs. HNBR o-ring material?

Thank you for the help.
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