that is a great ? and hard figure out because it could be 1 of many reasons. i reacently had this happen to me and it took mechanics 2 months to figure it out imagine that! it was a stopped up radiator. but in addition to that it could've been blown head gasket, a fuse, a sensor, water pump, plugged heater core for anyone out there that has a 97 protege if it is overheating DO NOT drive it if it's running more than 20 degrees above normal temp. the darn thing has plastic rings. good luck
could be fuel pump
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