My 2013 gmc acadia was empty in coolant reserve tank but not radiator...filled reserve tank with proper mixture and now it is maki g a glug glug glug sound off and on today while driving coming from that area

What is your question?

not leaking underneath vehicle either

What makes this problem better or worse?

hear it while driving today after filling reserve coolant tank last night

How long has your 2013 GMC Acadia had this problem?

just today after filling reserve coolant tank