Could that be displaying deg Fahrenheit? Check settings. If deg Celsius then check under drivers door mirror that the sensor is not covered or covered in crud
We have the same problem with our Peugeot boxer based Bailey. Temperature goes on a never ending cycle though sub zero to 80°! Haven't found anyone who can tell how to get to the sensor (which apparently is the little nipple thing) under the driver's side mirror. Have learned to live with it by adding it to the list of duff, cheapo, naff quality fittings that we pay a fortune for on our motorhomes!
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