I have a 2005 Infiniti g35 sedan and with 120,000 miles on it. As i was driving home from work yesterday in traffic i noticed the temp gauge going up slowly, even while i was going 35 mph in traffic before it could get to the top i pulled off the interstate and parked in the shade and let it cool, now i know that it is starting to get hot where i live in Scottsdale, arizona with it reaching 90 degrees already, but this seemed weird. I let it cool all the way down and then proceeded home slowly and cautiously off the interstate since i was only 1.5 miles from home. During that time it heated all the way back up and so i parked it in the garage and have not drove it since. I did check some things and heres the notes i can give so far.

--No warning lights on dashboard

--Oil level on car seemed fairly low but I am expecting an oil change soon

--There is coolant in the car and there is liquid under the radiator cap

--Both fans in the front of the car turn on

--No belts are broken and are all attached


Also heard something about burping your coolant system, Could this be a fix???:

Its likely to be a air bubble trapped in the water pump cavity. It will cause cavitation and prevent fluid travel. These engines are notorious for being hard to burp.

Heat the car up to normal temp - rev motor to 3000 rpms for 10 sec. Turn the motor off. Use the bleeder valve in the rear passenger side of the engine to slowly open and let air hiss out. When the air stops coming out close the valve. Do not remove the valve completely or you will make a mess with a very very hot liquid. Let the car rest for 10-15 min and cool.

Heat the car back up and repeat the process until no air comes out of the bleeder valve. I have had to repeat this step as much as 10 times before.


Any info will be much appreciated before i have to pay the shops expensive labor hours as i have no mechanic connections in arizona. Any info on how to test certain things would be nice like how to test the radiator or the water pump or thermostat. Thanks everyone

 

Check your radiator cap - advance auto or autozone have kits to pressure check the cap. If the cap isn't holding pressure you can overheat.
Even if you buy a new cap have it checked. I had to replace mine.

 

This was causing your engine to overheat? and it was that simple cool ill go get the cap checked now

 

The cooling system is based on a constant pressure. The cap is a integral part of the cooling system.

 

Cap would contribute to the overheating if it failed, but there could be many causes.

Can i ask when the last time you performed any service to the cooling system? Have you replaced/flushed the coolant at all recently?