q45 coolant reservoir level

[qship96]

Nothing a $2000 under plenum job cant fix! Take a flashlight and shine it deep inside the valley under the top of engine intake manifold{ the spider looking thing called the plenum} the coolant hoses deep under there are the most likely cause{you will see the pool of antifreeze} Common issue that affects EVERY old q45, usually around 80-100,000 miles- there are about 35 hoses under there that deteriorate with age and exposure to the massive heat buildup under there. The parts will run about $1500, or can be purchased for about $1000 as a specially priced kit from sponser "Infiniti of scottsdale".Labor is about 7 hours at most qualified shops to perform this procedure.

Search this site for plenum job- common and well documented information here concerning this issue.

[Infinitiguy19]

Could also be a more simple solution, Because the OP forgot to be more specific.

Did you flush the coolant recently? If so then it needs to purge the air bubbles.

Or if Qship96' method yields nothing I would try a coolant pressure test, If you haven't heard of it then have someone who has do it for you.

Has it gone below the Min mark at all?

Welcome to NICO.

[maxnix]

If you have no white smoke and the OEM (only) radiator caps are fine, then time to consider the plenum job. Lots of posts and pictures in IOM.

[maxnix]

OEM caps only!

[oldmako]

I'll bet you're glad that you didn't drop 2 grand and open a huge can of worms eh??

[maxnix]

OEM blacks are prohibitvely expensive, now.

Never seen a G50 with a hiked heinie. Sure front is OK?