I have a 2002 VW GTI VR6 (MK4 24 valve, 88k miles) that has an occasional battery drain issue. It won’t be able to start after parking depending on outside temps. The warmer it is, the faster the drain. It first happened this past summer in ambient temps over 90 degrees and currently when it gets somewhat warm. It has not happened in freezing temps or less than, I’d say, 50 degrees. Yet.
I’ve taken it to a VW/Audi shop where they pulled just about every fuse and tested for drain but given its occasional nature, of course they didn’t find the source cause.
Any ideas? The fans that run after engine shutdown do turn off after a while.
Also, since that shop didn’t charge me for the diagnosis, I feel the need to give them a shoutout. Anyone in the Queens/Brooklyn area, check out tyrolsport.com. Awesome service.