2009 Toyota Highlander Owners Manual - Page 468

4-3. Do-it-yourself maintenance CAUTION n When the hybrid system is hot Do not remove the coolant reservoir cap. The cooling system may be under pressure and may spray hot coolant if the cap is removed, causing burns or other injuries. NOTICE n When adding coolant Coolant is neither plain water nor straight antifreeze. The correct mixture of water and antifreeze must be used to provide proper lubrication, corrosion protection and cooling. Be sure to read the antifreeze or coolant label. n If you spill coolant Be sure to wash it off with water to prevent damage to parts or paint. 4 Maintenance and care 441