2010 Lexus RX 450h User Guide 2 - Page 616

5-2. Steps to take in an emergency n If "HYBRID SYSTEM OVERHEAT" is shown on the multi-information display Stop the vehicle in a safe place and STEP 1 turn off the air conditioning system. Ensure that the opening for the oil cooler is not blocked by dirt or any other foreign substance.If the opening is not blocked or if the message does not disappear after some time the opening has been cleaned, proceed to STEP 2. STEP 2 STEP 3 STEP 4 Leave the hybrid system operating and carefully lift the hood. Check if the cooling fans are operating. If the fans are operating: Wait until the "HYBRID SYSTEM OVERHEAT" message disappears and then stop the hybrid system. If the message does not disappear, call your Lexus dealer. If the fans are not operating: Stop the hybrid system immediately and call your Lexus dealer. After the hybrid system has cooled down, check the power control unit coolant level and inspect the cooling system for leaks. 622