why so complicated. try to write :

seems like intersectNorth and the rest are not booleans, my fault.
could you show the library or code snipped you use for the intersection check.

Your code should work, care to post the rest of the code so that we can make sure that it's not anything else that's wrong

EDIT:
also you should also try something like this before your if statement to make sure that it's suppose to work:

1. if(intersectNorth != null){
2.       println("north is not null");
3. }
4. if(intersectEast != null){
5.       println("east is not null");
6. }
7. if(intersectSouth != null){
8.       println("south is not null");
9. }
10. if(intersectWest != null){
11.       println("west is not null");
12. }

and look at the print

just to mention it again.
casey has a nice collection of intersection checks in his openprocessing account
http://www.openprocessing.org/portal/?userID=54