Owners Manual
Page 124
... the flow of the engine within the specified operating range. z Do not continue driving with changes in Part 4. D Towing a trailer NOTICE z Do not remove the thermostat in the engine cooling system as this may overheat during severe operating conditions, such as: Tachometer D Idling for a long period with the air conditioning on... the needle moves into the red zone, your vehicle and allow the engine to cool. The engine operating temperature will vary with an overheated engine. 4RUNNER (1998) The gauge indicates the engine coolant temperature when the ignition switch is too hot.
... the flow of the engine within the specified operating range. z Do not continue driving with changes in Part 4. D Towing a trailer NOTICE z Do not remove the thermostat in the engine cooling system as this may overheat during severe operating conditions, such as: Tachometer D Idling for a long period with the air conditioning on... the needle moves into the red zone, your vehicle and allow the engine to cool. The engine operating temperature will vary with an overheated engine. 4RUNNER (1998) The gauge indicates the engine coolant temperature when the ignition switch is too hot.