It was not uncommon for people to shovel hot coals from a wood stove under a Model T, but it was the transmission that needed the heat, not the engine. The grease would get so cold the car would drive forward in Neutral as soon as the engine started, due to the stiff lube oil creating drag on the planetary gears. All it took was a worn out or poorly-adjusted parking brake, and the person turning the hand crank was in danger of getting run over!
Jerry