The top part of my Heartland refrigerator is not cooling. the freezer seems to be working fine.

SOURCE: Refrigerator not cooling but freezer is

Something has stopped the cold air being ducted from freezer side to refrigerator side of things. Possibly duct blocked due to ice build up, evaporator not self defrosting etc. Turn unit off for a few days till it melts and then turn back on. If it was because a door has been left slightly open you will be ok. If for any other reason you will want to have it serviced in the next week or so.

SOURCE: frigidaire frs26zrf

IS THE EVAPORATOR FAN INSIDE FREZZER WORKING AT ALL IF IS NOT WORKING THEN THERE IS NO AIR FLOW TO THE BOTTOM PART

SOURCE: Kitchenaid KSRA25IL Freezer working Fine - Refrigerator not

I had a similar problem where the refrigerator side was not cooling well but I could feel very little air coming through the vent in the top left corner.I blew hot air from a blow driver into the vent for about 1 minute which melted ice that was hanging from the bottom of the vent cover.Cold air started blowing harder thru the vent and cured the problem.

SOURCE: my refrigerator won't stay cool but my freezer works fine

You have something wrong with the vent going from the freezer to the fridge. You probably have a defrost problem and ice is blocking the vent that goes from the freezer and comes out in the roof of the rerigerator compartment. Replace your defrost timer and bimetal.

SOURCE: Hotpoint htr17bb Top Freezer Refrigerator Freezer working, but refrigerator not cooling

Hi,
There are a few reasons why the refrigerator part will not cool...here are a couple of tips that will help you to figure out why the refrigerantor is not cooling...

Refrigerator not Cooling or Fridge not Cooling
http://www.fixya.com/support/r3662945-refrigerator_not_cooling_or_fridge_not

How to Defrost Refrigerator Defrost Timer Problem
http://www.fixya.com/support/r3771673-defrost_refrigerator_defrost_timer

heatman101