Ok, g35 coupe 06,52k miles Had over heating problem in april 2010,replaced thermostat, all's well. Now Jan 2011 overheating again, noticed upper & lower radiator hoses collapse, changed thermostat again,still overheating very first time out!!!!!! Also noticed that the upper hose very hot and lower hose warm at best, before I changed this last thermostat.I opened cap let air in hoses went back to normal. So is it air in system, bad water pump, bad radiator, what !!!!!!!! In NEED OF SOME GOOD ADVISE PLEASE

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Maybe your radiator is clogged.

I think the OP was referring to an engine overheating issue only while driving. If you are certain there are no air pockets in the system and the thermostat has been bench tested to verify opening temperature then its possible This could be from a failed water pump. I believe those years had plastic impellers on the water pump. If that broke you are getting no coolant circulation even though the water pump appears to be turning via the accessory drive belt. Also verify there are no obstructions I.e. dirt, bugs etc clogging vital airflow over the radiator. Debris can also get stuck between the condenser and the radiator as well and hinder airflow. Also verify your fans are working even though you state its cool at idle. Good luck!

see my heating troubleshooting tips section

It is suggested at 100,000 miles.

I have a 2004 G35 Coupe that had the same probelm.

I checked some fuses -- all appeared to be OK. Then tried locking and unlocking the driver-side car door several time, using the key and the car fob.

Presto, the window stared working again.

Caution, I believe there is an issue (at least with the coupe) about raising windows while the door is open and then closing the door.

-Make sure your thermostat is working properly, if not, replace it.
-Make sure your water pump is working properly, if not, replace it.
-Make sure you have enough coolant and that it is a good ratio of coolant to water mixture I use 50/50 mix of coolant and water.
-Check to see if your head is cracked or has a leak in the gaskets.
-Check your tail pipe to see if coolant is coming out of the back which will indicate a leak.
-Check the upper and lower radiator hoses for cracks and wear and tear and leaks.
-Replace your radiator cap

These are possibly problems and or solutions, but will better help you understand your overheating problem

there is a coolant cap on the overflow bottle check it for seal
i'd just replace it
also if you put the new thermostat in backward the overheating would be significant

My 04 G35 is overheating. I have read forums on the issue. Everything from a gasket on the rad cap, to bleeding the system, flushing the system, to a new thermostat.
I took it to the dealer and they said the cap is ok, but there is a very small drip that they can not find. They refilled it and there was no problem.
Today, a week later, the temp gauge went almost to H and when I got home I looked under the hood and the antifreeze resevoir was empty!! I had no heat either, but this makes sense if their was no anti freeze.