Haier Frezzer cooler (refrigerator) It runs and wont` stop

I have a Haier refrigerator and it does not stop running. I replaced the thermostat, the fan in the freezer compartment is fine and the holes that are between the freezer and the cooler box, are clear of any obstruction. Why the thermostat that is brand new does not get satisfied???..the charge is perfect too.
Thanks for any help on this issue.