Hello and welcome
The outside air temp is shown on the instrument cluster (you can look it up in you owners manual, look in the index for outside temperature display )
If by car temperature you mean the enigne temperature, you cannot see that.
The E90 has 4 different temperature modes depending on the driving conditions with temperatures varing over 20'C in different modes. BMW thought most people would think something is wrong when they see such temperature variations so they didnt include a engine temp guage
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