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New to the Group guys so if this has already been covered I'm sorry. When I switch on the air con in my 2007 R8 the light on the switch comes on but goes off after a couple of seconds. Any ideas?
 

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Could be the A/C pressure switch. I believe it's located under the drivers headlight on the US cars.Possible
part# 440-959-126-B. This is what was wrong on mine when this happened.
 

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When it happened to me it was the control module, bought one from Happyparts.de (used and cheap) problem fixed.
 

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I had same issue and my AC just needed a recharge. Could be a few different things, best to get the problem diagnosed before you start swapping things out.
 
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