Coolant leak only when shutting the car off.

Jsolo · 06-10-2016, 10:48 AM

^^Two radiator caps?? Where's the 2nd one located?

JARblue · 06-10-2016, 10:54 AM

Quote:

Originally Posted by Jsolo

^^Two radiator caps?? Where's the 2nd one located?

IINM, the reservoir cap is also pressurized on newer Z models. I think 2012+ model years.

Jsolo · 06-10-2016, 11:12 AM

I think you're right! Very strange. What benefit would there be to having a separate cap for the overflow tank in addition to the radiator cap? My MY2012 G only has one radiator cap, at the radiator itself. Reservoir uses a traditional screw on cap.

Looking at the 2015 owner's manual, found this pic. Look at part #3 & 12.

Google to the rescue!

SouthArk370Z · 06-10-2016, 11:47 AM

My guess is that it is a pollution control to lessen amount of coolant discharged. I don't see where a two pressure-cap system would do any better at cooling than one and it costs more. But that's just a guess.

Ghostvette · 06-10-2016, 01:23 PM

Quote:

Originally Posted by Jsolo

^^Two radiator caps?? Where's the 2nd one located?

Quote:

Originally Posted by JARblue

IINM, the reservoir cap is also pressurized on newer Z models. I think 2012+ model years.

Since the OP has a 2012 & mine is the same, I just passed on what mine has.

Sorry for the confusion...

Jhill · 06-10-2016, 02:59 PM

Quote:

Originally Posted by Ghostvette

Since the OP has a 2012 & mine is the same, I just passed on what mine has.

Sorry for the confusion...

One cap is actually a non relief cap (the one on the coolant pipe), the other is the traditional relief cap (on the reservoir). Basically it is now like a lot of euro and some American cars where the reservoir is actually a functioning pressurized part of the cooling system and not just an overflow. Do not mix these caps up, they even state which is which in them.

06-10-2016, 10:48 AM	#16 (permalink)
Jsolo Track Member Join Date: Dec 2011 Location: chicago Posts: 783 Drives: '12 G37 6MT Rep Power: 14	^^Two radiator caps?? Where's the 2nd one located? __________________ G37S Sedan 6MT, Eibach swaybars, Invidia Exhaust, Weaker Clutch Pedal Spring For sale links

06-10-2016, 11:12 AM	#18 (permalink)
Jsolo Track Member Join Date: Dec 2011 Location: chicago Posts: 783 Drives: '12 G37 6MT Rep Power: 14	I think you're right! Very strange. What benefit would there be to having a separate cap for the overflow tank in addition to the radiator cap? My MY2012 G only has one radiator cap, at the radiator itself. Reservoir uses a traditional screw on cap. Looking at the 2015 owner's manual, found this pic. Look at part #3 & 12. Google to the rescue! __________________ G37S Sedan 6MT, Eibach swaybars, Invidia Exhaust, Weaker Clutch Pedal Spring For sale links Last edited by Jsolo; 06-10-2016 at 11:15 AM.

06-10-2016, 11:47 AM	#19 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	My guess is that it is a pollution control to lessen amount of coolant discharged. I don't see where a two pressure-cap system would do any better at cooling than one and it costs more. But that's just a guess. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

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