1994 Chevy Corsica runs cold

1994 CHEVROLET CORSICA
230,000 MILES • 6 CYL • FWD • AUTOMATIC
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REAPERPEST
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my father just gave my daughter this car we drove it from arkasnas to illinois it never left the cold mark until we hit traffic on highway. then it started to overheat i turned on heater on got it to come down. when traffic let loose and we were back rolling it dropped back down to cold what could be doing this is thermostat stuck open ?
Aug 23, 2010 at 6:40 AM
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RASMATAZ
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Replace it and see what happens
Aug 23, 2010 at 8:46 AM