See also:

Have the vehicle inspected by your Lexus dealer immediately.
Failing to investigate the cause of the following warnings may lead to the system operating abnormally and possibly cause an accident. Have the vehicle inspected by your Lexus dealer immediately. ...

Cooling system
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Cleaning and protecting the vehicle exterior
Perform the following to protect the vehicle and maintain it in prime condition. l Working from top to bottom, liberally apply water to the vehicle body, wheel wells and underside of the vehicle ...