If Your Vehicle Overheats - Lexus RX 450h 2010 Owner's 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.
Follow the correction procedure as described below.
Correction procedures
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If "ENGINE OVERHEAT" is shown on the multi-information display
Stop the vehicle in a safe place and turn off the air conditioning
STEP 1
system.
Check to see if steam is coming out from the engine area.
STEP 2
If you see steam:
Stop the hybrid system. Carefully lift the hood after the steam
subsides and then restart the hybrid system.
If you do not see steam:
Leave the hybrid system operating and carefully lift the hood.
Remove the engine compartment cover. (→P. 478)
STEP 3
Check to see if the cooling fans are operating.
STEP 4
If the fans are operating:
Wait until the "ENGINE OVERHEAT" message disappears and
then stop the hybrid system.
If the fans are not operating:
Stop the hybrid system immediately and call your Lexus dealer.
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