2003 350z overheating issues

[Jimenez213]

hello fello zilvians. im having a hard time figuring out what the problem on my 2003 350z is. its been overheating on me and quite fast. i already replaced the thermostat and water pump. my radiator is working just fine as well. what is happening is the upper hose that is connected to my radiator gets hot while the bottom one that connects to my thermostat remains cold. what can i do? what seems to be the issue? if u can please help i miss driving my baby around!

[fliprayzin240sx]

Sounds like a shitty thermostat. Thats assuming that the car is actually overheating and not just a bad water temp sensor or air in the system.

[Jimenez213]

Sounds like a shitty thermostat. Thats assuming that the car is actually overheating and not just a bad water temp sensor or air in the system.

Thanks. I replaced the old one with a brand new one. Was trying to avoid taking it to the shop but I think that's going to be my only option now

[fliprayzin240sx]

Where did you get this brand new one? Just because its brand new, doesnt mean its good, specially if its from Autozone or Advanced. If you're looking for near OEM, atleast get it from Napa Parts. Then double check to see that it pops by sticking it in a boiling water.

[SLiDe_WaYz]

You need to buy OEM or Nismo for a
Nissan thermostat. The parts house thermostats are terrible and never work correctly.

Did you get all the air out the system? It took me 45minutes to burp my system when I replaced my radiator and thermostat. It's a PITA to do.

[blueshark123]

Did you bleed it well enough?

[Jimenez213]

I did bleed the system out well. How would I go about burping out my system? And I also did buy and autozone thermostat. Ill have to copp one from Nissan then just to make sure it really isn't the thermostat

[fliprayzin240sx]

If the bottom radiator doesnt get hot after a while, that means the thermostat isnt opening to let the coolant circulate thru from the radiator. No cooler coolant flowing into the engine = overheat. Like I said, you can get a thermo from Napa since they get their stuff from OEM suppliers. Just test them just to make sure before you slap it in the car. Get some boiling water, stick the thermo in there, use some kind of thermometer to test the water temp and see if the thermo opens up when its supposed to (roughly 74-80 degree depending on the thermostat rating).

[Jimenez213]

Sounds good. Thanks for all the help. I'm going to try that out before I take it to the shop. Thanks for the help and info.