i have a 2009 d40 navara stx and have noticed it does not heat up at all at idle i have sat it there before for 45 minutes and temperature gauge has not moved. on the d22 navaras they have a heat up switch when you flick it the engine idles at a higher speed which in returns make it warm up. i have sat and held my foot on the accelarator to bring the revs up at idle and this does make it heat up. just wanting to know other peoples thoughts because it is a pain in the ass with frost of a mornin and not bein able to heat up and clear the windscreen