Nexus 4 Overheating

Hey yall,

So, my N4 is great blah blah blah. I live in LA though, and I have my phone mounted to the dash while plugged in to AC and doing nav. Sometimes it gets really, freaking, hot. Every now and then it gets to the point where the battery will stop charging, which I assume is a failsafe for the battery overheating.

Anyone know if this is particularly bad for my phone? Any way I can go about avoiding this? I suppose I can just use a real GPS, but I love the voice control / user experience of having my phone be my central car unit.