My mk3 focus 1.6 tdci the snowflake temperature even though the outside temp is 9 degrees

Question

ive changed the complete passenger side mirror with a new one but the snowflake is  still on
it shows 2 degrees when in fact its 9 degrees outside then goes off when driven and  it thinks its five degrees outside

Answer 1

This is common problem in Focus, maybe due to unusual location of the sensor. Most vehicles have outside temperature sensor behind the front bumper.