I've noticed the my yeti is quite slow to warm up and rarely if ever reaches the full 90 since I bought it 2 months ago. 10/15km spin today it's only getting up to 55 degrees (-3 degrees)
Motorway run yesterday at 110kph for around 50 mins and only sitting around 68 degrees (outside temp 0 degrees)
I'm guessing it's the the dsg thermostat or at least worth trying first given the easier access.
I see a youtube video for a sharan dsg on youtube, I'd imagine the yeti is in a similar enough spot?
https://www.youtube.com/watch?v=Pzx2JMrfD-w&ab_channel=AleksandrZinkevics