Audi R8 air con

[Freddie328]

Hi
During a spirited drive on a hot day on the German Autobahns the R8 very quickly lost all its A/C gas,
There's no evidence of stone damage or oil leakage from the condensers.
Does this system have a relief valve that may have opened? The cars in Italy at the moment so a recharge if this is the case would be doable but not a strip down to replace faulty components.
Any info much appreciated
Thank you

[Freddie328]

Thanks for your replies.
Can the pressure switch be accessed without removing the bumper?

[Freddie328]

Hi Dr G
Ive located the problem to a leaky pressure switch.
Is the low side charging point by the front of the engine on the LH side?
Is this a standard fitting?
Is there a high side connection point anywhere?