DodgeJourney518

Hello, I have a 2014 Dodge Journey SXT AWD 3.6 and here lately the temp has been running a little higher than normal. When I turn on my A/C it seems as if it helps at times but others it seems it is causing it to run hotter. If I am still at a light it seems to go down in temp but when I am driving for long periods of time if seems to also run hotter. I recently have started using my heater which has help with the temp and it stays at a lower temp. I have no leaks and radiator and overflow is filled where needs to be. Any ideas on what is going on?