Car sometimes over heats. Replaced thermostat but still have problem. What else could be wrong?

1999 NISSAN MAXIMA
104,000 MILES
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MAXIMA99
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Can drive the car 10 miles one day and no problem. Drive 10 miles the next day and it over heats. Thermostat was replaced but didn't help.
Mar 23, 2012 at 5:14 PM
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SATURNTECH9
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So is it overheating temp wise?Or just boiling over the cap?Also is your radiator fan working when its overheating?
Mar 23, 2012 at 5:27 PM
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MAXIMA99
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Temp wise. The fan is working
Mar 23, 2012 at 8:34 PM
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MAXIMA99
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Could it be a problem with the radiator?
Mar 23, 2012 at 9:22 PM
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SATURNTECH9
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When the fan comes on when it gets hot Does the fan blow out really hot air out of the fan?Also have you checked to see if the radiator fins or condensor fins are blocked with debris like sand bags etc?Also when it gets really hot are the upper and lower radiator hoses getting really hot?
Mar 23, 2012 at 10:50 PM