Are you sure the module doesn't work, or do you just not like the Fahrenheit display?

I have a spare Fahrenheit module..... But, I would double check your wiring and test your probe. There's not a whole lot inside that temp module that can actually go wrong. It's one chip, and LCD and a backlight.

Use a meter to verify that the probe is working. Sometimes, because of where they are located (front license plate) they get crushed by feeble parking attempts, and either short out or open circuit.

-tp