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Freezer Frosts up at top of heat exchanger and blocks air flow

I have a Kenmore side-by-side refrigerator model 57542. I am having trouble determining what part went bad. My son left the door on the refrigerator open before leaving for school. Ten hours later it was closed, but it was too late, the heat exchanger frosted up and stopped the refrigeration. I pulled the cover off the heat exchanger and defrosted it. It wasn't the first time! I put the cover back on and plugged it back in. However, this time the refrigerator did not resume working, it frosted back up at the top of the heat exchanger. Repeated attempts to defrost the heat exchanger result with it frosting up at the top when returned to service.

I checked the Defrost timer, it turned off the compressor when tested.
The evaporative heater had 29 ohm across the leads
The Temp sensor TSTAT had 1.0 M ohm across the leads at room temp
The evaporative fan had 32 ohms across the positive and negative leads.

I suspect the problem is the fan because I have not seen it running through all this troubleshooting. But I am not up on when the fan should be running and when it should be stopped.

Any thoughts? I would like to replace the problem part the first time THX

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  • togjab Jan 07, 2009

    I have the same problem I think but the model has two fans, the main fan in the back over the condensor and the other one is in the freezer section called the evaporator fan.

    I believe the suspect is the evaporator fan, part number 10513803.

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Sometimes the fan only runs when the door is closed. Try closing the door first if you don't hear it running then more than likely it's the fan. The fan comes on when the temp in the refer falls above 36 to 38 degrees. After the refer reaches temp then it cycles off. It should be running every time the compressor comes on.

Posted on Dec 24, 2007

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