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I have had the radiator flushed and the appropriate fluid and level of checked. It is correct.
No it does not boil over
I have a Check Engine Light. I start my truck and, whether I have the heater on or off, approximately 10 minutes into the drive my temperature gauge starts to rise to till the overheat light comes on. It does not go into the red. Then it will start to cool down and drop back to normal. If I keep my heater off I do not have any more problems. If I turn my heater back on, it will rise again and then it seems to be alright after I turn the heater off and I have not experienced it happening after the two times. I cannot tell if turning the heater off has a great deal of effect. Especially when it does it even when I first start out and do not turn my heater on. I thought it may be the thermostat but it is so intermittent that I am not sure if it is that or a control for the cooling system. Any suggestions?