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I replaced the thermostat and flushed cooling system. dissconnected battery to clear message center. The second da after driving message came back, it is running both cooling fans, lower radiator hose is cool and top one is hot,but not too hot.Temp gauge is showing below cold. I dissconnected battery and restarted. Temp gauge came up to just below normal operating temp. revved up for 10 min, lower hose is warm. It is fine now untill next time. I did use a factory gm thermostat.