nut1 - 99 a6qa

[Bill Shaw]

I'm trying to get at the front cv joints on my '99 a6qa.  There's a nut 
(nut 1) and a bolt in the upper vertical member on the wheel bearing 
housing that holds the 2 outer control arm ball joints. see image at:
http://home.comcast.net/~p-928/nut1.jpg

Nut 1 is off,  the bolt is stuck,  I can't get it out.  Is this bolt 
threaded into the the upper member,  or is it just rested in place?

I'd like to apply a little heat there but I'm concerned about the rubber 
boots on the control arms. 

Thanks,

Bill
99 a6qa (green,  aren't most?)