Join Date: Feb 2006
Location: Denver, CO
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air bubble in the heater core. D40 is extremely sensitive to coolant levels. You should be hearing a gurgling sometimes while driving as well.
overfill (aka fill it up) the overflow bottle, it usually gets the air out. always did for me on my D40 anyway.
2007 Super Black 4x4 Xterra. 2.0 Radflo's, PRG Uppers, Sliders, Shackles, Add-a-leaf, Bilstein 5100's, Rear Tire Carrier, 285/75R16 Open Country's.