Lexus ES-300 2001 Manual page 366

When the engine overheats
Pull safely off the road, stop the vehicle and turn on your
emergency flashers. Put the transmission in "P" and
apply the parking brake.
A: If steam is coming from your engine:
Turn off the engine. Leave the hood closed until there
is no sign of steam or coolant. Your engine could have
been seriously damaged already. Call your Lexus
dealer for assistance.
CAUTION
To help avoid personal injury, keep the hood closed until
there is no steam. Escaping steam or coolant is sign of
very high pressure.
B: If no steam is coming from your engine:
Leave the engine running and turn off the air
conditioning. Check the following.
D Is the cooling fan operating?
D Is the coolant in the acceptable range?
D Is the engine drive belt O.K.?
IN CASE OF AN EMERGENCY
349