Air Conditioning - Replacing 'O' Rings
Does anyone out there have any hints on replacing 'O' rings in an aircon system? Car is series one 156 2.5. There is definitely a leak at the junction under and behind the radiator on the nearside. I can't tell which of the two junctions here it is and figure that if one 'o' ring is leaking through neglect, they probably all want to be done. I can get to these and those at the pump, condenser and filter easily enough, but I assume there are more at the cabin end of the system - where are they?
Also, any info on the rings themselves would be helpful - are they something I can source in a kit from Halfords or a plumbing store?
I also suspect there is a slight leak at the low pressure valve, as when the system was charged, I'd get a little hiss when I took the cover off, as if there was some pressure building up there.
When the system was charged last summer it was making some strange hissing and whooshing sounds, seemingly from behind the dashboard, which I suspect was the sound of the gas escaping - does anyone out there have any experience of this?