In order of ease of checking:
1) bubbles in radiator - do what I say above. Takes about 10-15 minutes. Just add coolant - $9?
2) head gasket - can drain oil to see if you can see coolant in your oil
3) water pump
4) also could be plug like my 1993 Civic Ex had. Some how the plug from the car to the radiator fan was damaged. The car's temp skyrocketed unless I was driving (and I was in NYC in traffic).
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