Lexus RX 450h 2010 Owner's Manual page 486

CAUTION
When the engine and hybrid system are hot
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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
When adding coolant
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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.
If you spill coolant
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Be sure to wash it off with water to prevent damaging to parts or paint.
Radiator and condenser
Check the radiator and condenser and clear any foreign objects.
If either of the above parts are extremely dirty or you are not sure of their
condition, have your vehicle checked by your Lexus dealer.
CAUTION
The radiators and condenser may be hot after driving
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Do not touch the radiator or condenser as they may be hot and burn you.
4-3. Do-it-yourself maintenance
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