Antifreeze is supposed to be good to at least -35C. If you are worried about starting, make sure the battery has a full charge and the motor oil is either 5W30 or 0W30.
The biggest concern is coolant freezing of course, so if in doubt get it checked. You don't want the coolant to freeze in the bottom hose.
After the engine starts, the next thing is the ATF being too cold. So take it easy for the first mile or so.
Leave the cabin temp controls at AUTO. The electronic control will not engage the blower until the engine starts to warm up. No need to blow cold air around.
-7C is warm!
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My back feels better when I sit in a Volvo seat
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