If the temp gauge periodically rises higher than normal and then falls back to normal, you probably need to change the thermostat as it may be sticking shut and then popping open. It's a good time to change some hoses, coolant and check the belts if they've been on the car for awhile.
SOURCE: 1996 ford contour gets hot , no hot heater or temp guage movement
Is your temperature gauge working now? That is of more concern then your heater as you wouldnt know if your engine was overheating until its too late. Your heater core could be clogged, they get clogged quite easily. You can flush them or replace. The part is inexpensive but on some models you have to take out dash to replace them, but on other models it only takes about 30 mins and a few bolts.
SOURCE: 2002 malibu runs hot.
Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE
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