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My 350z has a closed coolant system not like my older GM vehicles where just leaving the radiator cap open would burp the air out of the cooling system. My car would overheat and I didn't know why until someone told me that I needed to buy this to completely remove the air out of the coolant system. How to do it: From all my reading the best way to tackle this issue is to attach the funnel to your radiator cap opening while cold and fill the funnel about 1/4 up so when system burps fluid falls into they system rather than more air. Let the car idle until normal operating temperature also have your heater set to full hot to allow the fluid in the heater core to flow through also. Mainly look at your needle on the gauge and once its about 1/4 of the way up or if you have a gauge with numbers and it reaches 160 to 180 you should be good. At this point the vehicles thermostat will open and start allowing the hotter coolant to start flowing into the radiator and the cooler fluid should start running into the engine block. Bubbles should start coming out of the funnel this is the air that was trapped in the system coming out. Add coolant to the funnel to keep it at the 1/4 mark so air can't get back into the system. Also if you have an RPM gauge you can step on the gas pedal and hold the RPM's at 3000 for 10 seconds and then release for 10 seconds, do this 3 times. Then let the car idle until you don't see to many bubbles coming out and shut down the car. This should take no longer than 30 minutes then shut down the car. Leave the funnel there for as the car cools they system will still draw fluid from the funnel during cooling. Check your coolant overflow tank and fill it to the full hot line. Once car is cooled down follow the instructions on how to remove the funnel and close your radiator, by this point 95-100% of the air is out of the system. Now for the 1st few days after doing this check the radiator level every morning and if its down top it off. Also for the next week you want to keep an eye on the over flow tank because any air that is left which will be minimal will work its way out and draw fluid in from the overflow tank and if it gets empty it will start drawing air in again and we don't want that. Once you see the levels in the overflow tank staying steady between full hot and full cold you should be good to go. Good luck and always be careful when working with the coolant system to not burn yourself or anyone around your project.