so i know this has probably been asked but i searched and couldnt find much. now my car just kinda out of no where just started to run hotter than usual so i replaced the thermostat and the coolant and im going to replace the radiator cap now it is still over heating is this because i forgot to bleed the air and when i do will that stop the overheating

 

most likely it's because of the air in the system. You'll need to bleed it.

 

for sure i did a little more digging and found a guy with the same problem and it was the air that was doin it

 

"Forgot" to bleed the air? Why bother do a half-assed job of changing coolant when you overlook the most important part?

At least you found the issue. Best of luck.

 

Bleed is a must on this car, and it can be a PITA.

 

So i actually drained the coolant again so i could things right. I undid the air relief plug and began to fill it back up with coolant until until it came out of the air relief. I closed up the air relief and left the radiator cap off and started the car. Now instead of the coolant bubbling and then going down through the thermostat it just spilled out all over the place. Keep in mind i just replaced the thermostat. So i called someone and he thinks due to whats happening it's my head gaskets and because the 350z has an aluminum engine the gaskets go bad easier

 

forgot to mention this guy is a mechanic and is gonna take a look at it next week until then i cant drive though

 

If you want to do it right, you need a decent air compressor and one of these to properly change the coolant in your system. If you can't do that, you really should just take it to a shop that can.

 

that makes sense but ive done more digging to know if ur head gasket is blown or not and i have 3 a few days ago i drove to some place and back to my house and saw a bit of water in my exhaust tip one sign of a blown head gasket. another was the morning when it began to over heat i was on my way to school and what i thought was just warm air leaving my exhaust like when u see ur breath was thin smoke no one else's car was doing that. the last was overheating before i did anything with the coolant it was overheating and my oil pressure was lower than normal which makes sense with a blown head gasket theres no compression

 

and i was not moving when the thin smoke was coming out and it only did that at one light i didnt see it again so i thought nothing of it