My Chevy Equinox 2013 cooling fan does not work all the time . I reset a relay and works fine . When I turn the Ac on the fan works fine for a while , then it does not work again . I put a new relay now the engine is running hot . Help me please .

on those, often weak fan motors do that. have them load tested to see if they are shorting out with too much resistance

I will try to do a load test as you suggest . thanks a lot