2005 Saab 9-3 Owner's Manual - Page 86

84 Instruments and controls NOTICE If the needle, despite the above action, enters the red zone, stop the car in a suitable place and allow the engine to idle. If the needle continues to rise, switch off the engine. If the needle repeatedly enters the red zone, stop the car as soon as it is safe to do so and check the coolant level (see page 205). WARNING Temperature gauge The temperature gauge shows the temperature of the coolant. The needle should be in the middle of the scale when the engine is at normal operating temperature. If the needle goes into the red zone (which can occur at high outside air temperatures or under heavy engine loads), choose the highest possible gear ratio and the lowest possible engine speed, and avoid shifting down. Never open the cap of the expansion tank completely when the engine is hot, open with care. The pressure in the coolingsystem can cause hot coolant and steam to be released. Failure to heed this warning may result in personal injury. Turbo gauge The turbo gauge indicates the air volume used for combustion, which is equivalent to the engine load. At low loads and when the engine is used for braking, the needle will move within the white zone. Under certain barometric conditions the needle may enter the first part of the red zone without necessarily indicating that a fault has arisen.