2003 350z overheating issues - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Jimenez213 · 01-05-2013, 03:49 PM

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* · 01-05-2013, 05:22 PM

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 · 01-06-2013, 01:34 AM

Quote:

Originally Posted by 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.

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* · 01-06-2013, 10:26 AM

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 · 01-06-2013, 10:29 AM

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 · 01-06-2013, 10:29 AM

Did you bleed it well enough?

Jimenez213 · 01-06-2013, 04:50 PM

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* · 01-06-2013, 05:27 PM

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 · 01-06-2013, 09:19 PM

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.

01-05-2013, 05:22 PM	#2
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	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. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

01-06-2013, 10:26 AM	#4
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	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. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

01-06-2013, 10:29 AM	#5
SLiDe_WaYz Zilvia FREAK! Join Date: May 2011 Location: Texas Age: 35 Posts: 1,282 Trader Rating: (6) Feedback Score: 6 reviews	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. __________________

01-06-2013, 05:27 PM	#8
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	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). __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

01-06-2013, 10:29 AM	#6
blueshark123 Post Whore! Join Date: Apr 2006 Location: North Jersey Posts: 5,481 Trader Rating: (55) Feedback Score: 55 reviews	Did you bleed it well enough?

01-06-2013, 04:50 PM	#7
Jimenez213 Leaky Injector Join Date: Apr 2011 Location: riverside ca Posts: 52 Trader Rating: (2) Feedback Score: 2 reviews	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

01-06-2013, 09:19 PM	#9
Jimenez213 Leaky Injector Join Date: Apr 2011 Location: riverside ca Posts: 52 Trader Rating: (2) Feedback Score: 2 reviews	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.