From purchase I was having an issue with the cabin heater not providing warm air until I turned it right up. Having searched around these forums, I discovered that the problem be a dirty interior thermostat.
.. well, could have been ..
Before:
After:
Seems to have done the trick
I took more photos as I went, so I'll try write a 'how to' at some point
That would be OK, but you'd be blowing the dust etc into the back of the housing. I doubt that would be too problematic though in realty .. unless you manged to the Bongo on the road for half a decade or something, in which case the housing would fill up with dust and stuff