CRUISE CONTROL DOESN'T

[FBFISH@aol.com]

Gentlemen-I would like to trouble shoot/repair the cruise control on my 1990
V8. The documentation I have shows there are four parts involved:
       * switch (on steering column)
       * control unit (behind dash on passenger side)
       * vacuum control motor
       * vacuum vent valve brake switch
The dealer said that the control unit is bad, but he hasn't been correct
about anything yet so I don't want to spring for a new control unit until its
been properly isolated.
    Questions:
       1. Where is the vacuum control unit located?
       2. Where is thevacuum vent valve located?
       3. Can I access the control unit without removing the 
           top of the dash ie from under or thru glove box?
       
BTW, when I was replacing the frontright outside CV joint boot, my son (an
ACE Porche Mech) was marveling at the UFO brakes on the left side and noticed
what appeared to be some unconnected wires. These were visible looking
directly at the engine from the wheel well. We fished them up from the engine
compartment and they look like they mate. I did not connect them because I
recall reading a listers admonition to resist the temptation. Unfortunately,
I lost my saved E mail in trying to upgrade my ancient MAC to AOL 3.0(20Mhz
wouldn't hack it and all files were lost in the regression ).

      * 4. Are these lose connectors (pair male&female) located on the left
side of the engine towards the firewall for test or could they be the reason
my cruise control doesn't work?

Your collective  wisdom on any/all of the above will be greatly
appreciated.TIA and MERRY CHRISTMAS!!!