Date registered: Aug 2007
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was that hissing noise the steam and coolent? if it was i will put money on the head gasket. the easiest way to tell is to remove the t stat all together and run the car with out one. if it overheats check the radiator for cold spot.
you could have a cloged radiator. check every corner and in the center. if you find one theres the problem. if there is a resriction in flow, it builds pressure, overheats the block. cuasing coolent to vaporize, causing it to blow out the cap/vent.