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Re: car overheats
A bad thermostat only causes 2 things:
Overheat due to lack of flow (stuck closed or opens late)
Over cooling due to stuck open thermostat.
The water level going up and down when you rev it is a great indicator of a working water pump.
Air bubbles can only get from the headgasket. And other place where coolant would leak would be an external coolant leak. Not bubbles in the coolant.
Rad. cap is a possibility, BUT you said that you had the cap off and then started seeing bubbles. Kinda obvious in my book. A bad rad cap will cause the high overflow/low rad neck situation. Try that first, but I would expect a "blown" headgasket.
I call the other hg failure a "leaking" headgasket. That is where coolant is sucked into the cylinders and then burned. Hence, white smoke and miss. It also slips by the rings into the oil pan.
Wiz
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