I’ve noticed the following and wonder what might the reason be for it:
- A/C running and vents open - no problem with smell/odor
- A/C off, heat/fan off, vents open - sometimes get this engine-y smell coming out of vents
- Heat fan on, vents open - usually no problem, but sometimes may get engine-y smell out of vents
The smell mostly comes when vents open & fan not operating. And definitely no smell when operating under A/C mode. I just changed a dirty cabin air filter. So we’ll see if that helps. Could it be dirty filter? Something up with ventilation system or the blower fan?