The warmth of a car engine is a highly prized spot for small animals like squirrels looking for a place to get away from the cold during the winter. Sometimes squirrels get underneath the hood of the car out of sheer curiosity or because they think there may be some food hidden under there. Getting rid of squirrels from car engines can be a necessity if the local population comes to find the spot a particularly inviting place.
Spray small animal repellent on parts of the vehicle that don’t get hot. This can include the front tires, the undercarriage and the bumper. If you spray it directly beneath the hood and then start the car up, the odor is likely to repel you more than any animal.