This is the kind of weather when car systems are put under most strain, and especially when travelling in remote areas.
And remember, your car is only warm while its engine is running. So if on the road, you really should have some basic emergency items on board to keep you going until picked up.
These ought to include extra clothes (Jacket/Gloves/Hats/Scarves), warning triangle, ottled water, mobile car-phone charger, blanket and flashlight.
Be sensible, be prepared.
