Fridge too cold

I think I know what's wrong but I wanted to get a second opinion from those who probably know more.
My Sears Refrigerator (Regular freezer on top kind) is freezing up in the fridge compartment. I have already verified that all vents are clear and I can hear the fans run free and twice partially defrosted it and still it freezes up (~20F).
Looking at the parts diagram, I see there are 2 thermistors one in freezer and one for the fridge and an electronic control module
I think it is the fridge thermister and think I should just go and replace it and see what happens. Does this sound like the best course of action?
Anybody know what the thermister should read out on a multimeter (ohms while hot and hold)? so I can test it. Any other useful go no-go tests I can try to verify the failed part?
Reference to parts drawing for my model http://www.searspartsdirect.com/partsdirect/retrieveSubComponentPartsAction.action?diagramPageId 002&documentId=K0507007&modelNumber674203402&productCategoryId66000&brandId83&modelName=TOP+MOUNT&backToLink=Return+to+Sub+Components
At least too cold won't ruin the food inside and I have some time even though I need to thaw the milk for a glassfull.
Thanks in advance'
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i know it souds dumb but have you set the fridge warmer? is the freezer set excissevely cold.?
my mom called me once many years ago my fridge is frozen........ someone had bumped the control:)
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On Sun, 2 Mar 2008 12:44:25 -0800, "pipedown"

Used to have the same problem. Either it freezes up the main compartment or it doesn't get cold enough. My fridge is 30 years old. Vents were clear, etc. I finally popped out the freezer compartment panels to look inside. The panels are thin sheet metal and they flex. There were only two studs holding the floor panel in place. Press the panel far enough to clear the stud. The rest of the panels can be disassembled by sliding them out. The rear verticle panel is held by three screws and to remove it the floor panel needs to be removed first.
The freezer coils are against the back wall. The vent openings and the transfer fan are also there. In my fridge the bottom half of the freezer coils were encased in solid ice. It took something like six hours to melt the ice. That's one good explanation why previous overnight defrosts worked only for a few months before acting up again. Works like a charm now.
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pipedown wrote:

http://www.searspartsdirect.com/partsdirect/retrieveSubComponentPartsAction.action?diagramPageId 002&documentId=K0507007&modelNumber674203402&productCategoryId66000&brandId83&modelName=TOP+MOUNT&backToLink=Return+to+Sub+Components
You might check the door seal. The frost build up can be caused by excess humidty entering the freezer. The manufactuer suggests checking the door seal, and cleaning with a cloth and some light cleaning solution [read soap].
--
Zyp



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