2011 Toyota Avalon Owners Manual - Page 413

4-3. Do-it-yourself maintenance CAUTION n When working near the electric cooling fan or radiator grille Vehicles with smart key system Be sure the "ENGINE START STOP" switch is turned OFF. With the "ENGINE START STOP" switch in IGNITION ON mode, the electric cooling fan may automatically start to run if the air conditioning is on and/or the coolant temperature is high. (→P. 401) Vehicles without smart key system Be sure the engine switch is OFF. With the engine switch in the "ON" position, the electric cooling fan may automatically start to run if the air conditioning is on and/or the coolant temperature is high. (→P. 401) n Safety glasses Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting in the eyes. NOTICE n If you remove the air cleaner filter Driving with the air cleaner filter removed may cause excessive engine wear due to dirt in the air. Also a backfire could cause a fire in the engine compartment. 390 AVALON_U (OM41428U)