2000 Saab 9-3 Owner's Manual - Page 60

60 Instruments and controls If the needle approaches the red zone, which can occur in very hot weather or when the engine is under a heavy load, drive in the highest gear possible, keep the engine revs low and avoid shifting down. Check fuse 3 (radiator fan) in the fuse panel under the hood, see page 191. 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 by looking at the level visible through the plastic tank - do not remove the cap. IB343 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 enters the red zone, the warning light will come on and an alarm chime will sound. NOTE If the needle, despite the above action, enters the red zone, stop the car immediately. If the needle stays in the red zone, stop the engine. If the coolant level falls below the MIN mark, the SID will display the message "FILL COOLANT FLUID". Pressure gauge The pressure gauge indicates the pressure in the induction manifold. Under low load and while the engine is braking there will be vacuum in the induction manifold.The needle of the pressure gauge will then move within the white zone. At higher engine speeds and higher loads, the turbo-compressor produces an overpressure in the induction manifold. The needle will then enter the orange zone. Normally the needle should not enter the red zone, since a monitoring system sets limits to the charging pressure and protects the engine. WARNING Never open the coolant expansion tank cap when the engine is hot. It contains hot coolant under pressure. Failure to heed this warning may result in personal injury. IB344