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Originally Posted by SD1too
I would definitely not do that for the following reasons. In my experience, these 'O' rings do not normally require lubrication. The union is of similar construction to brake and high pressure oil lines and there is virtually zero risk that the 'O' ring will deform. If lubrication is used, the workshop manuals specify a smear of refrigerant oil. You do not want even the smallest amount of rubber grease entering your air conditioning system where it could cause a malfunction.
Simon
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I don't know where that little nugget of information came from, but it's completely incorrect Simon
Brian
