Good day,
Tricky problem.
The fresh food compartment gets it's cooling from the freezer.
When running zero degree air is blown up the back wall and out to the fresh food compartment thru a modulating thermostat.
This modulating tstat is continuously opening and closing .
I have seen many of these where the spring that tries to keep the flap on this device closed, has popped off.
If you can find the spring, it usually can be reinstalled, if not, you have to replace the whole control.
If that control is working O.K. another problem is at play.
During cooler weather, and light usage, the machine tends to stay off longer.
This causes the air in the machine to stratify. Warmer air rising, colder air falling. Thus, the warmer air reaches the modulator at the top of the machine, and throttles it wide open.
On the next running cycle, it allows a large volume of near zero degree air to enter the fresh food compartment.
Here are two possible solutions. The first cannot be verified.
A user claims that the return air vents behind the crispers got blocked by various items from food handling, and prevented the cold air at the bottom from returning to the freezer.
Your using a foam at the bottom would only make the matter worse.
The second option, would be to replace the modulating thermostat, and test for results. It's a pricey part.
Hopes this gets you some results..
Jack....
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