A little more information on your vehicle would be helpful.

 

Dude your avatar is very distracting lol.... 03 v6 frontier 4 door... What else ya need to know?

 

I have no idea but am giving this a bump out of curiosity, hope someone has a thought.

 

thats an odd problem, and a first for me.
my first thought is that you have an automatic transmission, and in cruise control with overdrive on, the truck is hunting for gears creating excessive heat in the transmission and the transmission heat exchanger built into the lower radiator is bringing additional heat into the main cooling system and pushing it over the top.

sounds a little crazy, i know, but i'm just spouting off an idea. for starts, check your transmission fluid level with the truck idling in neutral at operating temperature.

 

Ok roastbeef it is an auto I don't recall feeling it shift but that theory does make sense. Ill check my trannie fluid.

 

A tranny and radiator flush, to freshen up the fluids, couldn't hurt as a starting point.


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Is it overheating or just the gage showing too hot? If just the gage, I'd look for an electrical problem in the circuits near the dash.

 

Well I never let it get hot enough to overflow my antifreeze is there a good way to tell whether its just showing hot of if it's really hot?

 

How far does the gage go toward "H"? I'd let it get really hot and find a place to safely pull off, shut it down, lift the hood and if its hot, you should be able to tell. Listen for coolant boiling or bubling. If you do this several times and cannot determine a difference from hot to not hot, I'd suggest you research the electrical diagrams. You may have some stray current using the cruse causing the voltage to change for the coolant sensor.

 

It may not be hunting. When I set the cruise, it will hesitate for a few seconds and drop out of overdrive. Running interstate speeds with OD may be causing you to run hot.

BTW if this is the case and you figure out how to actually fix it, let me know:smile:. I just stopped using the cruise.

 

my cruise never drops out of overdrive at interstate speeds. It will only drop on pretty steep upgrade. I have never had a temperature problem with cruise control on versus pedal control.

 

Me either bob-w until recently with this frontier

 

I let it get up to or inbetween the lil line just before the 'H'

 

What was determined to cause this overheating? My truck exhibits the exact same symptoms.