Has heat but not after a hour starts getting cold

Asked by Chaddouglas Nov 22, 2018 at 08:01 AM about the 2004 Chevrolet Blazer LS 4-Door 4WD

Question type: Maintenance & Repair

I flushed the system out and changed the themstat
and put coolant flush in it and I have heat but only
when I'm in the gas hard but goes away after I'm
not and put new coolant in it and still the same
thing could it be a water pump gone bad or what?

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