I have a Whirlpool side by side fridge freezer model 6ED2FHKXRL. It is 3 years old and cost about $2000. It freezes in the vent on the wall between the fridge and freezer. I need to defrost my "frost free" every 6 weeks. Whirlpool authorised repairer doesn't know what's wrong and Whirlpool won't return my calls as I am out of warranty. I first called Whirlpool 5 and a half months ago - no resolution, no contact from Whirlpool.