If Your Vehicle Overheats - Lexus GS 450h 2008 Owner's Manual

5-2. Steps to take in an emergency

If your vehicle overheats

If your hybrid system overheats:
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 under the hood.
STEP 2
If you see steam:
Stop the hybrid system and carefully lift the hood.
If you do not see steam:
Leave the hybrid system running and carefully lift the hood.
Remove the engine compartment cover. (→P. 421)
STEP 3
Check to see if the cooling fan is operating.
STEP 4
If the fan is operating:
Wait until the engine coolant temperature gauge begins to
fall and then stop the hybrid system.
If the fan is not operating:
Stop the hybrid system immediately and call your local
Lexus dealer.
STEP 5
538
After the hybrid system has
cooled down sufficiently, check
the coolant level and inspect the
radiator core (radiator) for any
leaks.