You shouldn't have to burp your cooling system unless you just performed work on it and opened it up. If you are just getting the waterfall sound for no reason except for driving it, then you have a problem.
And I really think this crazy "burping" method is a crock, no disrespect to suprra girl or anyone else. I just replaced my head gasket and after 2 or 3 heat cycles (driving for an hour, let it sit overnight) my cooling system bled itself, just like any other water cooled engine would. When an engine gets hot it spits the overheated coolant into the coolant overflow bottle, then when it totally cools down it sucks it back into the engine from the overflow and thats when the system bleeds itself. Now if you have a leak somewhere either internal or external during this cool down, it won't suck the coolant from the overflow, it will suck air from where ever its leaking from. 9 times out of 10 (with a MK3 supra) it will be from a blown head gasket. I'm anal when it comes to cooling systems (actually Im pretty much anal about everything) and I've studied how cooling systems work first hand, and every single car/truck acts the same unless there is something wrong, like in my case a blown head gasket. I check my overflow everytime I heat the car up and get to my destination to make sure its at the same place the last time I drove it, its a bad habit and people are always wondering why I'm looking under the hood. And I always look at the overflow in the morning before I start it up, making sure its at the same place it was the morning before.
Have fun on that hill......
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