The following may indicate that your vehicle is overheating:
Correction procedures 1. Stop the vehicle in a safe place and turn off the air conditioning system, and then stop the engine. 2. If you see steam: Carefully lift the hood after the steam subsides. If you do not see steam: Carefully lift the hood. 3. After the engine has cooled down sufficiently, inspect the hoses and radiator core (radiator) for any leaks.
If a large amount of coolant leaks, immediately contact your Toyota dealer. 4. The coolant level is satisfactory if it is between the "FULL" and "LOW" lines on the reservoir.
5. Add coolant if necessary. Water can be used in an emergency if coolant is unavailable. 6. Start the engine to check that the radiator cooling fan operates and to check for coolant leaks from the radiator or hoses. 7. If the fan is not operating: Stop the engine immediately and contact your Toyota dealer. If the fan is operating: Have the vehicle inspected at the nearest Toyota dealer.
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Toyota Tundra Service Manual > Engine Immobiliser System (w/o Smart Key System): Precaution
PRECAUTION PRECAUTIONS WHEN USING TECHSTREAM (a) After all DTCs are cleared, check if the malfunction occurs again 6 seconds after turning the ignition switch to ON. PRECAUTIONS FOR THE KEY (a) The key is a precision instrument. Be sure to observe the following: (1) Do not drop or strike the key. (2 ...