I had the same problem with the heater control on my 2013 4/4. I suspect it was due to the dealer not refitting the dashboard properly after installing the power steering. I had a very chilly trip back from my niece's wedding with the top down!
Getting the hard wire fitted can be tricky (and dropping bits is a buggeration!)
NB. WD40 s a
Water
Displacement treatment not a lubricant: it will dry to a varnish very quickly. Use a good oil to ease parts
