Re: Electrical Burning Smell
I doubt that it was a passing car if both of you noticed it as you explained. Under no circumstance should anything within the cabin be heating to the point that it produces a burning odor, IF it is working properly. An electrical short, failing or poorly installed heating element, or a failing/failed PCB component can easily cause what you describe. Pay attention to it and look out for anything that stops working. The vehicle diagnostics system is sensor based and unlikely to report an electrical problem unless it affects a drivetrain sensor or a module loses power (or fails) and drops off of the network. For instance, the diagnostics system cannot tell when a heating element is malfunctioning or a cap in the radio/amplifier fails.
(I would stay vigilant, at the very least!)
2011 WK2 4x4 3.6L Stone White