Most ECMs are programmed to allow the truck to idle if the temperature gets below the point where the fuel is at risk of gelling. Other than that, there are options. APUs (auxiliary power units) are one option; bunk heaters like the Webasto and Espar bunk heaters are others.
You can keep it warm by keeping it out in the sun. If there is no sun, than I don't know how it will it will stay warm.
The bird sits on the eggs and by using heat to keep them warm until they hatch
warmblooded animals keep warm by generating their own heat when they are in a cooler environment.
That is the fan cooling the liquid in the radiator to keep the engine from over heating.
surfing under the sun in warm climates or using a rubber suit in cold waters
They eat fishes!
Using a wet Bain Marie
If the thermostat is stuck open, the radiator is able to cool the antifreeze faster than the engine can heat it.
Wearing thermal underwear or layers, using hand warmers, or investing in heated clothing can help keep your body warm, including your testicles, in cold weather.
You can keep food warm without electricity by using insulated containers, wrapping the food in towels or blankets, using a thermal cooker, or placing the food near a heat source like a campfire or hot water bottle.
whales keep warm by their blubber! good question
The fur on their bodies keep them warm.