Cruise Control Problems

[PeterBergin at aol.com]

Curious, my cruise control has not worked for years (prior to the AC  vents). 
 However I have vacuum tested it and when I power the pump directly  with 12 
volts, the linkage moves, I assumed it to be the steering column switch  or 
the brain box on the cruise.  Once in a great while the cruise will work  for a 
day or two.  I assume the cruise and the AC are completely different  deferent 
systems, am I wrong?
 
Pete