1st Gear Member
Join Date: Mar 2004
Location: New Hampshire, US
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When outside temp drops to 3 deg C (37 deg F) or below OBC autmatically displays outside temperature, regardless of what you set it to or what it was set last time and car beeps.
The reason for that to warn driver that outside temperature dropped to the point, that ice can forme on the road surface at certain atmosferic conditions, like bridges, open roads with strong wind, etc....
The fact that outside temperature displayed is -40 deg C (or F) most likely means of a damaged sensor(s) behind splash guard in wheel well. Unless it is really that cold in June, where you live...
It is probable, that your're having problem with your AC, I think outside temp is factored in the logic of AC.