Ok guys have mercy,

I have never posted on a forum ever, but I am desperate. I have a 2005 350z that has been overheating. I have the De engine and it has about 45,000 on it. The coolant system is basically brand new. I have replaced the water pump, thermostat, engine coolant temp sensor, both radiator hoses, radiator, and I have bled the system several times. Even with all that the car still overheats and the heat truck doesn’t work. Heater blows cold air. I have tried everything but am stuck right now anyone have anything else to try.

 

Elevate the front end and bleed more

 

I elevated it today and tried everything like I read on here. It feels like the coolant it isn’t cycling like a stuck thermostat. I will try again tomorrow and let you know how it goes.

 

Take off one of the heater hoses at the firewall, have someone start the car and check if there is flow.
What led up to you changing all these parts, and what’s the history of the car?

 

I have been restoring this car. It sat in a filed for months. Did a engine swap and fan did turn on so changed coolant sensor. Did water pump because it was open and engine could have set for god knows how long. Thermostat was first change for overheating problem after bleeding it four times.

 

So you know nothing about the engine? Start by doing like I said with the heater hoses to check flow, there may be a blockage somewhere. Could also have a head gasket issue or any number of other problems. How did the coolant look?

 

By chance have you checked the radiator cap?

 

yeah.....calmn down it's almost certainly air in the system. Get a lisle funel if you don't have one and search for all the 'Tricks' on here for getting rid of air bubbles.