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Coolant Change Makes Dramatic Difference
I have changed my coolant in my 3.8 each summer because it is so inexpensive to do. The temperature guage takes a noticeable drop after a change.
As far as yours running warm, make sure you have enough coolant. I have noticed that after I change my coolant, it takes a little time to work all the air out of the system. I check it daily for about a week...then no problems. If you have air in the system, it will run warm. The air will not open or close the thermostat, only liquid.
I would also check and make sure the thermostat is not stuck. While it is a pain to change, I changed mine when I did my last coolant change. Again, preventative is cheaper than broken and then repair.
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