Overheating?

[jvmbc4]

So I read thru several threads so as not to create a duplicate and this one seems to be somewhat similar to my issue. The temp will get just past the 180 which looks to be about 200 degrees. The light will start blinking, it has never stayed on solid. A blinking light is supposed to mean either coolant level or a fault in the engine compartment cooling fan. Here is what I have done so far and what I plan on doing. But I need some input about what I may be missing.
1) The coolant was low three times after refilling it, so I plan on getting a new coolant cap.
2) The drivers side cooling fan works on both low and high speed, while the an on the passenger side is only working at high speed. I checked the relays and they are all good. Do I need to change out this fan?
3) The engine fan is working, I jumped the relay. Can the thermo sensor go bad?
4) Water pump and thermostat have 20,000 miles in 9 years. should I change them out?

Thanks, Jon