As above,, lower speeds seem ok, air directors seem ok, temps too, however full fan with any air direction the heater sounds like a huge humming modern jet engine (if you know the type, a high bypass one). Also, had a lag2 where heater hummed on blow 4, and to a lesser extent on 3. If you listtened, the humming is modulated in pitch regularly, sometime with a superimposed buzzy humming on top. I thought is it some kind of tdm signal breakthrough as its presumably controlled from the uch, and may not be a filtered 12v supply? I never had a problem on the lag, just the noise, and canclip showed no fault. But the espace, the humming/howling is soooo loud, I never heard the like. Blocked pollen filter was suggested on the lag, but changed and no effect. Anyone else cracked this one or even had this thing? Thanks!