HVAC Case Removal WARNING! Disconnect the batteries for at least 15 minutes before starting to disassemble the dash. This is because of the Air Bags in the dash. This is just a safety precaution to keep the possibility of discharging your Air Bags while you work on your dash. So that being said we'll disconnect the batteries and work under the hood for a short period. There are a few chores we got to do under the hood. &#