Cooling System Service
 

Hello all,

I have been trying to figure out what exactly Nissan is thinking between the different models in terms of cooling system service. For the G37, the FSM clearly states that there should be an air relief plug on the driver's side heater hose. Some have it, and some don't. I checked the 370z FSM and apparently all 370z models don't have this heater hose bleeder screw. The procedure for both the 370z and g37 is apparently the same - my question for you guys is this:

when you change the coolant in your 370z, how do you bleed all the air out? For the nissan altima, there is a special tool available to ensure all the air has been removed, and keep in mind this is no "spill free funnel."

You can look at some FSM screen shots I have posted in the other thread here:

No air relief plug on heater hose - can't bleed cooling system - MyG37

Any input would be appreciated.

Can it be done the old fashioned way? Run the car with the radiator cap off and slowly fill as air bubble come to the surface. Replace the cap, run for a while, let it cool, pop the cap and refill if necessary.

Apparently not - there is a high probability of undetected engine overheating leading to cracked heads, etc.

there is a bleeder screw on the drivers side radiator at the top backside.youll have to take the intake out to see it.

edit nvmd,i seE you have a G37

The one on the radiator is there, but this thread isn't about the one in the radiator - it is about the heater hose air relief plug (see photo)

http://www.myg37.com/forums/attachme...-airrelief.jpg

I still hear bubbling sounds in the heater core, and the only bleeding procedure I saw was lifting the front end of the car with the radiator cap off.

If there's a bleeder deal, I'd like to know so I can try to get more air bubbles out. My car is more likely to start heating up when ambient temps are 100F and beyond.

The best, and proper way (apparently), is to use an airlift tool to create a vacuum in the system, and then allow it to fill up with coolant - be as in previous models, this shouldn't be mandated but should be an option. Now with no bleeder screw, it's going to be necessary to resort to more extravagant coolant replacement techniques.

Is there a bleeder for the 2013+ models. We can't find it!?!

No, unfortunately they took the bleeders out. I recommend only vacuum filling the system.

Order this funnel or chk your local parts store for it. fill your radiator with this funnel funnel fastned, turn car on, turn heater on high, add more water/coolant to funnel, go have a few beers, and voila. you're done.

Amazon.com: Lisle 24680 Spill-Free Funnel: Automotive

I've actually found that with that unit alone, you still get a lot of trapped air in the system. One car actually had the engine block crack with this approach and no apparent overheating. just fyi..

I did it with my Car on ramps for about an hour. Revving occasionally and ever since then I haven't had a problem with coolant temps since.


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Vacuum filing takes all of 5 minutes to do and you're done. No need to waste time/gas burping the system and/or hoping it doesn't overheat.

http://www.amazon.com/UView-550000-A.../dp/B0002SRH5G

Good post, great info. Guys!
Thank you!

Any idea if that's something you can rent at a local auto parts store?

If I did more work on cars, that's probably a nice tool to have. But $130 for something that I will use every 5-7 years to save 30-45 minutes of time and and $5 in gas isn't really worth it IMO. Maybe Harbor Freight has a similar product for less money. Or it's probably worth asking around to see if a friend or shop has one I could borrow for a few beers.