Fridge wiring

I'm a newbie having just purchased a used Class C. On our first trip we experienced the fridge freezing up. Did some research and learned this is not uncommon. I ordered a new thermister for the Dometic fridge and while waiting for it to arrive I pulled the outside vent cover to see what the thermister hook up looks like. I noticed two things that didn't seem right and I'm hoping someone here can advise. I can add a couple of pics but I don't see how. I think the thermister plugs into the board in the top left corner but I see a loose wire there (blue with a black sleeve) that seems like it should go somewhere. Beside the thermister plug is a smaller, two pole plug that has no wires going to it. Is this blue wire supposed to be connected there and, if so, to which pole? There is also an unconnected two pole plug just loose in there. Any ideas what it might be and where it goes? Unless there's a way to add pics you likely won't be able to tell what I'm talking about but fingers crossed just in case. TIA

edit. I've added a link to 1st pic

and second pic

Fridge is Dometic model # RM2652