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I had this problem to with my1989 V6 2.8 Chevy Corsica, that I've had for 8 years. I replaced all of the easy things first like...theromstat, tempsensor, gauge sensor. Still after all of that I had the same problem. One of the things I should have asked myself was did I maintain the cooling system? NO! What does the fluid look like (does it look like antifreeze or is it dark brown).
What does the inside of the radiator look like. So I opened the cap and not so suprised to find it was full of deposits. I replaced the radiator and it's been running cool ever since. Now it does heat up in traffic, but the fan kicks on, and the response time of how fast it cools is much much better, and now on the highway on a rather hot day it will heat just above half and lower.
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