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I would replace the thermostat (less than $15 for thermostat and gasket) and do a garden hose water flush. Run water till it runs clear. Be sure to "burp" the hoses to get all of the air out. Top off the radiator and bring the level to Max on the overflow tank and dive it for a few days and then do it a second time. Keep close tabs on your water level. At any time with plain water you get the P0128 it would be time to look closer. If all gauges read correct and no CEL codes then I would flush and add the Prestone 50/50.
I see you are in Texas. If you are just using as a daily driver and not hauling or towing loads there should be no issues with water in the coolant system for a few days. A 50/50 mix will be more efficient cooling your engine and you need the freeze protection for next winter.
Last edited on Sun May 3rd, 2020 07:22 am by Tsquare
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Tony
NE ATL
'04 XLT regular cab 3.slo stepside
Semi retirement