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Can you take a photo of the part and upload it here with the paperclip attachment I am not finding the number WR7X1 valid?
The picture you sent is of the relay - it's the old HOT WIRE relay but you are saying the problem is the thermostat which I assume is the cold control inside the fresh food section AND you say it has 4 terminals on it ?? Can you send a picture of it and are there 4 wires going to it ?
Don't see HOW it could be running with the cold control not wired in. Do you have a picture of the cold control ?
If there is just two wires then it doesn't matter which terminal it goes on - it's just a switch, making and breaking the circuit to the compressor. If the compressor runs without the cold control even being in circuit , somehow it is wired HOT all the time , the hot wire is broken by the cold control (also the freezer fan , if it has one will not run , or the condenser fan, if it has one , will not run.
Here's what I would do - get rid of the old relay and go to an appliance parts store and get a Supco RCO410 , which is a solid state relay and capacitor all in one . It has three wire that plug on to the compressor terminals - start, common, and run. White wire is start, red is run and black is common on the new relay. To determine which terminal is which on the compressor - remove the wires from the compressor and using an ohm meter set to read ohms on a low scale go from pin to pin on the compressor. The HIGHEST ohm reading is from the start winding to the run winding , the LOWEST ohm reading is from the run winding to common and the MIDDLE ohm reading is from start winding to common. The remaining two wires on the new relay are for the incoming wires , one of which is neutral ( usually white ) and the other wire is power from the cold control ( usually black ). The new relay is inexpensive and will replace the obsolete hot wire style used on this fridge.