Land Rover Repair: 2000 Disco II Problems, vacuum lines, check voltage

Question
John,
I have a few issues with my Disco II.
First, my cruise control is inop, I saw your post about vaccum lines are those a do it yourself type job?
Second my horn is inop, any thoughts?
Third 2 of my door locks will not lock or unlock after manually locking, thoughts?
Fourth, I have a suspicious rattling/knocks coming from my front end suspension. It happens while bouncing over potholes.
Thanks so much for your time.

Answer
Vacuum lines for the cruise are definitely a DIY job.  Look for splits and split ends.

The horn itself is probably bad, but of course it could be the relay or steering wheel contacts.  get a test light and check voltage at the horns.  That's step 1

If two doors do not unlock you probably need new lock actuators in those doors.  $200 and 2-3 hours to install per door

There is a lot to rattle . . . check shocks bushings, suspension bushings, everything that moves.

Good luck with it all

Check out my car blog at http://robisonservice.blogspot.com
John Elder Robison