2005 Chevrolet Malibu Owner's Manual - Page 273

Driving On Grades When towing a trailer on long uphill grades while the outside temperature is above 85°F (29°C), reduce your vehicle speed to 45 mph (72 km/h) to avoid overheating the engine cooling system. Reduce speed and shift to a lower gear before you start down a long or steep downgrade. If you don't shift down, you might have to use your brakes so much that they would get hot and no longer work well. Pay attention to the engine coolant gage. If the indicator is in the red area, turn off the air conditioning to reduce engine load. See Engine Overheating on page 5-24. Parking on Hills {CAUTION: You really should not park your vehicle, with a trailer attached, on a hill. If something goes wrong, your rig could start to move. People can be injured, and both your vehicle and the trailer can be damaged. But if you ever have to park your rig on a hill, here's how to do it: 1. Apply your regular brakes, but don't shift into PARK (P) yet. 2. Have someone place chocks under the trailer wheels. 3. When the wheel chocks are in place, release the regular brakes until the chocks absorb the load. 4. Reapply the regular brakes. Then apply your parking brake and shift into PARK (P). 5. Release the regular brakes. 4-43