No you probably have an air bubble. I would jack the front of the car up and pull the rad cap off. Usually the air bubble will pop out the cap (the air rises to the top). Air will not open a t-stat, only water hitting the bi-metal.
Hope this helps, if not let us know and we try something else.
Jason
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2003 Satin Silver Cobra (12.47@113.6)
1989 GT Racecar (11.0x's on motor and an aborted spray run of 10.27)
1997 F-350 Powerstroke
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