2006 Jeep Grand Cherokee Owner's Manual - Page 150

150 UNDERSTANDING THE FEATURES OF YOUR VEHICLE To Accelerate for Passing Depress the accelerator as you would normally. When the pedal is released, the vehicle will return to the set speed. NOTE: When driving uphill, at elevations above 2,000 feet (610 meters), or when the vehicle is heavily loaded (especially when towing) the vehicle may slow below the SET speed. If the vehicle speed drops below 25 mph (40 km/h) for 5.7L models, or 30 mph (48 km/h) for 3.7L/ 4.7L models, the Speed Control will automatically disengage. If this happens, you can push down on the accelerator pedal to maintain the desired speed. Vehicles may exhibit several 4-3 downshifts under the above conditions. To reduce the frequency of the downshifts and to improve vehicle performance, it is advisable to lock out overdrive. Press the TOW/HAUL switch on the lower center switch bank (below the Heating/Air Conditioning controls). WARNING! Leaving the Speed Control ON when not in use is dangerous. You could accidentally set the system or cause it to go faster than you want. You could lose control and have an accident. Always leave the system OFF when you aren't using it. Driving Up or Down Hills When going up or down hills, it is possible for your vehicle to lose or gain speed, even though the Speed Control is engaged. The automatic transmission may also downshift to a lower gear, to maintain speed going up or down hills. If going down a hill steep enough to cause the vehicle to gain speed, press the brake pedal, which will disengage the Speed Control and help slow your vehicle.