If Your Vehicle Overheats - Lexus RX450H Manual

5-2. Steps to take in an emergency

If your vehicle overheats

The following may indicate that your vehicle is overheating.
 "ENGINE OVERHEAT" is shown on the multi-information
display:
The engine may be overheating.
 "HYBRID SYSTEM OVERHEAT" is shown on the multi-
information display:
A hybrid system component such as the power control unit or
an electric motor (traction motor) may be overheating.
Correction procedures

If "ENGINE OVERHEAT" is shown on the multi-information
display
STEP 1
Stop the vehicle in a safe place and turn off the air condi-
tioning system, and then stop the hybrid system.
STEP 2
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
STEP 3
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RX450h_EE
After the hybrid system has
cooled down sufficiently,
inspect the hoses and radiator
core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact
any authorized Lexus dealer
or repairer, or another duly
qualified and equipped pro-
fessional.