Lexus GS450h Owner's Manual page 537

Start the hybrid system and turn the air conditioning system on to check
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that the radiator cooling fans operate and to check for coolant leaks from
the radiator or hoses.
The fans operate when the air conditioning system is turned on immediately after a
cold start. Confirm that the fans are operating by checking the fan sound and air
flow. If it is difficult to check these, turn the air conditioning system on and off
repeatedly. (The fans may not operate in freezing temperatures.)
If the fans are not operating:
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Stop the hybrid system immediately and contact any authorized Lexus
retailer or Lexus authorized repairer, or any reliable repairer.
If the fans are operating:
Have the vehicle inspected at the nearest any authorized Lexus retailer or
Lexus authorized repairer, or any reliable repairer.
If "Hybrid System Overheated Reduced Output Power" is shown on the
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multi-information display
Stop the vehicle in a safe place.
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Stop the hybrid system and carefully lift the hood.
2
After the hybrid system has cooled down, inspect the hoses and radiator
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core (radiator) for any leaks.
Radiator
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Cooling fans
2
If a large amount of coolant leaks,
immediately contact any autho-
rized Lexus retailer or Lexus
authorized repairer, or any reli-
able repairer.
GS450h_300h_OM_OM30F92E_(EE)
7-2. Steps to take in an emergency
537
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