hello my350z user. i will be changing the coolant on my 06 redline z for the first time. and i was just wondering that , can i just drain the fluid and refill with new coolant and dont have to remove or unscrew the heater bleed screw. i cant find or seem to know what is the purpose of remove that screw.

 

You can, but your not going to get all the air out of the system. Pass side back of the motor, heater line with a T in it, you need a large phillips head to remove it.

 

yes you right i found the the heater bleed screw...tomorrow before i go to work i will be buying the heater bleed screw......but by the way so how do i do this... any complete diy ... because i want to switch coolant just before i can do a long trip to vegas... so according to the diy i found i can drain the coolant after that remove the heater bleed screw . then after that replace the screw and replace the radiator cap and refill radiator with new coolant and after taht bleed the system by letting the car idle throught normal working temperature and then after it reach it normal temps. rev the engine to 3k rpm and hold it for about 10 second then after that shut off the car and let it absolutely cool down then refill ?
color me if i am missing something or you guys found a way to bleed the system faster

 

You sound a little inexperienced and A LOT of folks have had an extremely tough time getting all of the air out after doing this job. Maybe I got lucky because I had zero problems, but if you don't nail this on the first try, you could get stranded on the way to Vegas.
If you're not fully confident on this, I just wouldn't risk it before a big trip. Try it when you get back.

 

jack the front up high as possibly higher than bleeder screw then all u need to do is keep rad cap off with car at idle with heat full bllast, for like 20 minutes you will see slow amounts of tiny bubbles make sure u got a beer to drink.

 

why dont you do backflush? i havent dont my but i did back flush on my vr4 and teg. all you need is a prestone flushing kit. i like the flushing idea because it is not cleaner. i refill with new coolant from nissan.

 

Bleeding the air is tough on the car, my only advice is watch the temps while your doing it, and don't assume things are going well at any point and leave it unattended.

+1 on the jacking up of the front end, I personally park on a steep incline to do it.

 

well i dont know how long is the last time the car had an coolant flush... because the car perform very well with AC on low setting and on 117 degree arizona heat the car have no problem...and i did alot of research the best bet it just to let the dealership did it . if anything goes they fix it and not me... because im planning to do it after the trip..i only live about 4 hours from vegas and i will be driving at night so it will be cooler..any more tip?

 

Coolant lets the HEAT work good, not the AC.

 

how often do you change the coolant?

 

It's not that difficult to do once you get back, I just don't want to see you stranded on your way to Vegas if you screw it up.
When you get back, get a Factory Service Manual (FSM) and follow the directions precisely. It takes a while but then it's done and the coolant lasts for years.
IMO, adding the new coolant very very slowly (as it says in the manual) is an important step that I think a lot of people miss.

 

Honestly, I've not noticed a difference in adding the coolant slowly, or not. Its always been a P.I.T.A. But I did notice a substantial difference in bleeding the car high, on jackstands.

 

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