the cab heater fan turns itself off after 20min-60min and wont come back on .turn off ignition leave short while it comes back on.been like that from new.got tom tom pro and dc dc coverter vauxhall says its that.
Electrics, ECU, Warnings & Lights
So I'd guess the truth/test would be to disconnect those and see what happens.
Pull the fuses.
If , for whatever reason you doubt VX report , get a second opinion .Do remember any work , modifications carried out by yourself will probably give grounds to validate your VX warranty .