water pump on 3.6 2010 or newer?

My 2010 Lacross has 110000 k (about 70000 Miles)on it now .Back about 20000 k ago on my way home from Texas i noticed it was running hotter than usual and was not getting any heat from the heater .I got into a motel and checked it out ,the fluid reservoir was low So i got a gallon of prestone i filled up the reserve with pure prestone no water i ran it a ways checked it and refilled it ,I am suspicious of it all the time now but have not had a problem since .
 
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