My son has a 2005 350z. He is having cooling problems with the vehicle. So far I have replaced the radiator, thermostat, cap, and both upper and lower hoses. Still getting cool air thru vents even though I have heater on high, fans on max, to bleed system. Cooling fans are working correctly. Still overheating. Any help would be greatful. Thnx

 

continue to bleed the system ... you replaced all that stuff when, likely, in reality it just needed bleeding...these motors are incredible difficult to bleed out...lisle funnel will help

 

What kind of funnel?

 

a google lisle coolant bleeding filter...

 

This is the funnel you'll need!!

 

Do you know about the bleed port on the heater hose ?

 

Here is how I finally got mine bled:

- With the engine cold, take off the radiator cap and insert the Lisle funnel
- Fill the funnel to about 1/3 full
- Start the engine. Heater on hot, fan on high, make sure to turn the ac off
- Let the engine run for about 1/2 hour (no I’m not exaggerating) revving it to over 4K every couple minutes
- Shut off the engine leaving the funnel in place
- Go watch a movie or something. Just walk away from the car for about 90 minutes

These engines get hot quick but it can bedifficult to get the thermostat to cycle. When the engine cools the system will slowly burp out bubbles and replace that space with coolant. You just have to be super patient and understand the design of these engines.

You can also use the bleed port as Terra mentioned. That works best with two people. With the engine cold, one person uses both hands to squeeze the upper radiator hose, while they squeeze the other person turns the bleeder just to the point where air comes out, then tightens it up when coolant comes out. I didn’t have much luck this way and definitely recommend the Lisle funnel method.

 

Like others have said just continue to bleed, I put a normal funnel in the radiator and it worked fine however a Lisle would've made it easier. I had to bleed my car for 3 days, but that's since I'd let it get hot bleed out air and then just continue the next day. I get home from work at 5:30 pm, didn't want to go back outside after messing with car.
What I'd do is unthread the cap of the bleeder valve on the heater hose, car running I'd then squeeze the top radiator hose while also having the funnel in. That made the funnel level rise along with knocking air out the bleeder valve.

Like I said I just did that for 3 days and got the air out fine, the heater took around 2 mins to heat up but after 2 weeks it bled the remaining air itself and works perfect now.
It takes A LOT of time, don't get impatient.

 

Mine was a pain in the *ss to bleed, they say the highest point is the heater core.

 

Agreed,
It's a little black cap to remove and prime the heater core. With engine stopped, remove the cap, fill with coolant until bubbles are gone. Replace cap.
Same process with a COOL radiator cap and overflow container.

Drive/run until normal temp, rinse and repeat until heater blows hot and temps are stable.
gl!