Wat makes engin runs hot when heat is not on but when heat is on car runs at normal temperature

Seems like the cooling fan is helping cool the coolant via the heater core -- with the heat on inside the vehicle. Have you ensured any and all air has been purged from the cooling system? Are you sure the cooling fan is working when needed? Is there any debris in front of the radiator or between the radiator and condenser? www.repairpal.com/repair-shops