Vents to the crawlspace under a house can, indeed, be covered. But that creates a "dead air" space. Vents provide, well, ventilation. Consider why covering them is necessary. Some vents have screens over them to keep critters out but let air in and through. NEW ANSWER All vents that lead to the outside should be completely covered. An unconditioned crawlspaces has very poor air quality. Opening the vents just adds to the problem. When the outside temperature hits the crawlspace temperature, condensation occurs which results in excessive humidity. The correct fix depends on where you live geographically but is basically the same. The crawlspace does need air. It needs air from your hvac system. That is how to avoid dead air.
NO.
volcano vents are under the volcanos
You don't. Motors have vents to dissipate heat. Although you can see the windings through these vents, don't cover them or the motor will overheat and burn up.
Gable vents go on the ends of the house where the peak is. At the top point of the triangle.
Just heater outlets for the rear area. If you were to remove the console assembly which hides the engine cover, you would see a duct running from the top to beneath the floor. It feeds the vents you mentioned.
Yes, especially if you live in an area where the humidity is higher. The vents allow moisture in the air to escape from under your house. Moisture trapped under your house can cause mold and floor rot. The vents should always be open a little. This is to ensure you don't get a sick home and so the air circulates through the house. That's if these are hvac vents. If the vents go to the outside, they should always be closed.
Hydrothermal vents can get very tall. Many of them are as tall as a three story house.
Yes vents can be in the floor instead of the wall.
90% clean your dryer vents,repair any torn screens!
open the bonnet and right at the top under the air con vents you have the battery under a cover (please note that only mechanics or Audi mechanics can take it out as you have to dismantle the entire air vent system
Usually it vents from the valve cover.
open the bonnet and right at the top under the air con vents you have the battery under a cover (please note that only mechanics or Audi mechanics can take it out as you have to dismantle the entire air vent system