My friend's 6gc has a moon roof that ONLY works when it's cold (in the morning, or late at night). When it's warm or hot it will only open about half an inch and get stuck there...

What would be the problem!?!??!

At first instinct I'd say the glass stretches a bit, therefore it can't move as much, but I've had the same problem (sort of) and that wasn't the answer.

After a while of not going anywhere, the sunroof opened and then actually started screwing up again by not wanting to close on command. Possibly a bad gear in my case. =/

We should unscrew that sucker up and see what's bad inside.. hmm..