The glup sound you are hearing i believe is the airconditioning motor that selects where the air is directed to.
It might have lost a tooth in the motor.
Common r33 problem i have read.
+1 for not working
EDIT: I got confused
I thought this was about the "My content" button in the dropdown menu behind the username.
That doesn't work, like this post should be in there now but it's not.
yeah danny @ jpc has a HGC10 but with L28 instead of 2 litre.
I can't recall if it's a Coupe (KHGC10) or Sedan (HGC10)
I've seen it in person, very nice.
Unfortunately too far for me and car isn't in a good condition for it.
Will try to get to Skylines Australia "Skyline Nationals" in Shepparton VIC this year.