I have heard that using the recirculate setting on your air conditioner is unsafe and can result in depleted oxygen in the cabin. Is this so?
No! Almost all vehicles heating and A/C systems provide for some freshair to be channeled into the passenger cabin at all times, regardless of whether the controls are set to recirculate or fresh. This is done for several reasons.
1. To keep the cabin under slight pressure so that exhaust fumes don't get sucked inside.
2. To keep the air in the cabin fresh at all times.
3. To help purge stale or obnoxious odors from the cabin.
4. to prevent someone from suffocating inside the car in the event they are trapped inside.
