90' S2 heater on problem fixed, thanks!
 

While driving, heat came on and stayed on not matter what I did. I read all the threads about it and checked the heater control arm clips under the dash above the gas pedal. Sure enough that's what is was, broken clip. Put the rod back in and it works now. (need to get a new clip somewhere).
SOOOOO, thanks for all the posts, couldn't have fixed it without them, wouldn't have known even where to start. Whole job took me about 15 minutes. THHHAAAANNNNKKKKKS

special thanks to JAKELL for his post.

rare post...a 'thanks...problem fixed'

thoughtful...which means you are rare too Marko

and for the forum...thanks for the thanks !