Further to my last post on this subject I have got round to taking a photo of the cabin temperature sensor that came with the second hand interior light cover I bought. As you can see it is coated with a grey substance, which I first thought was thermal paste that you use when installing a new processor to a computer motherboard but it seems to have been sprayed on, a small area on the part that protrudes from the light cover is worn away, possibly from being caught when the interior mirror is adjusted.
The original cabin temperature sensor on my car has no grey coating and I am wondering if this was some sort of improvement on later cars?
