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Replacing Discharge Hose. How much oil to add?

toddk63 on Fri January 23, 2009 11:01 AM User is offline

Year: 1999
Make: Honda
Model: Odyssey
Engine Size: 3.5l
Refrigerant Type: 134

I have had a slow leak in the AC on my 1999 Honda Odyssey. I added a can of 134 a few months ago. I added another can a few weeks ago. I finally found that leak. It is the compressor discharge hose. The hose was wet with PAG oil. Observing the hose while the AC was running, I saw a slow dribble of oil coming out of the leak (where the fitting is crimped to the hose). With this leak rate in mind and the fact I am on my second can of 134, how much oil should I add back to the hose when replacing? Does the hose itself hold a significant amount of oil as well?


Todd K.

94RX-7 on Fri January 23, 2009 11:32 AM User is offline

There's no good way to accurately determine how much oil has leaked out other than flushing out the entire system then adding the factory specified full charge of oil back in. The hose itself, unless it has a muffler in it, contains a negligible amount of oil.

If it were mine, I'd add probably 1/16th of the total system oil capacity when reassembling it. So if the system takes 8 oz of oil, then I'd toss in around 1/2 oz.

You might also check the factory service manual to see if they specify an amount to add when replacing that particular hose.

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