2007 Saab 9-3 Owner's Manual - Page 165

Starting and driving Driving in hilly country with a heavy load The transmission fluid can overheat when the gearbox is strained, for example, when driving with a trailer on hilly roads. To avoid the transmission fluid overheating, always drive with the selector lever in the D position. The adaptive gear change patterns are then active. High air temperatures or a faulty oil cooler can also cause the transmission fluid to overheat. Overheating reduces the service life of the fluid. 165 Towing Towing of cars with automatic transmission, see page 195. Limp-home NOTICE Do not tow a trailer if limp-home mode is engaged. If the transmission malfunctions, the control module will activate limp-home mode. Drivability will be affected to varying degrees. The following message is shown on the SID: Gearbox malfunction. Limited performance. Descending hills If the speed of the car increases while descending a steep hill, despite the accelerator being released, the control module will change down. If you desire more powerful engine braking, manually select a lower gear (see page 168). WARNING Remember to use the braking effect of the engine (1st, 2nd or 3rd gear) when you are descending long or steep hills to spare the brakes. Overheating can cause the brakes to fade!