I just replaced the thermostat and gave the coolant system a flush and replaced the prestone. Seems to have done the job.
put in more coolant but its not running hot
Your head gasket could be on the way out if there is oil in the coolant or it is consuming coolant. Replace the thermostat before you start suspecting the head gasket.
Overpowering seems closest. Perhaps consuming, or intoxicating.
There is a sensor, shaped like a smooth plastic finger that pokes up from below along the engine side of the resevoir. You should see a little "bumped out" place there. Don't replace it. It doesn't touch the coolant. It relies on a magnet on a float just on the other side of the plastic inside the resevoir. When the coolant is full and hot, try banging on the resevoir. Don't break it! It seems that whatever float system they are using sticks, regularly. Jake McCahn
Seems that the problem is not your neck but your inner ear, dysfunction of the vestibular system (feeling of motion when you are stationary). Consult your doctor specialized for Inner Ear.
a satellite in constant orbit in syncronisation with Earth - a stationary satellite
Water pump with a broken impeller blade. Possibly defective fan relay, fan motor, or fan clutch, depending on what it uses.
Check the water pump
The factory coolant is Dexcool. I used the Prestone universal, works with all models type. Seems to be fine.
check coolant level and make sure there is no coolant leaks
Head gasket? Low coolant level? Water pump not circulating coolant? Thermostat not opening? Radiator plugged or restricted?