2010 Lexus RX 450h User Guide 2 - Page 468

4-3. Do-it-yourself maintenance CAUTION The engine compartment contains many mechanisms and fluids that may move suddenly, become hot, or become electrically energized. To avoid death or serious injury, observe the following precautions: n When working on the engine compartment l Make sure that the indicator on the "POWER" switch and the "READY" indicator are both off. l Keep hands, clothing and tools away from the moving fans and engine drive belt. l Be careful not to touch the engine, power control unit, radiator, exhaust manifold, etc. right after driving as they may be hot. Oil and other fluids may also be hot. l Do not leave anything that may burn easily, such as paper and rags, in the engine compartment. l Do not smoke, cause sparks or expose an open flame to fuel. Fuel fumes are flam- mable. n When working near the electric cooling fans or radiator grille Be sure the "POWER" switch is off. With the "POWER" switch in ON mode, the electric cooling fans may automatically start to run if the air conditioning is on and/or the coolant temperature is high. (→P. 485) n Safety glasses 4 Maintenance and care Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting in your 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. 473