Hey this is my 2009 G37X.
Today I started up the car and it was idling, and I noticed a lot of coolant was leaking. I looked underneath the car and I could see that the coolant appear to be pooling up around the middle of the steering rack. I tried looking to the back of the engine by looking over it and I couldn’t see much there wasn’t much space there’s a big puddle of coolant in front of the car. the engine wasn’t running for too long. Any help will be appreciated. FYI I have already replaced the Heater Core hose and the Hose from the drivers side throttle body line to the back of the engine.

 

I would try this. For smaller leaks and won't clog anything. If that doesn't work then I would say take it to a shop. I've tried the stronger coolant stop leaks and wouldn't recommended them. https://shop.advanceautoparts.com/p/...yABEgJ3pvD_BwE

 

That ain’t a small leak!