Lexus 2004 GX470 Owner's Manual page 375

STARTING AND DRIVING
D To allow proper operation of your vehicle's
ventilation system, keep the inlet grilles in front of the
windshield clear of
obstructions.
D If you smell exhaust fumes in the vehicle, drive with
the windows open and the back door closed. Have
the cause immediately located and corrected.
360
snow, leaves, or other