http://www.redlineoil.com/products_coolant.asp
increase RPM, decrease in temp (car stationary) = waterpump
increase in speed, decrease in temp = cooling fans not coming on.
I would try to get another few years out of it since the heat is within range. No fishtank bubbling sounds? With the chirping you wonder if the waterpump bearing is seizing up = you will soon know.
It would be nice to add and LED indicator for the cooling fans to see when they are on.