1997 Chevrolet Astro Owner's Manual - Page 213

Turn Signals When Towing a Trailer When you tow a trailer, your vehicle has to have extra wiring (included in the optional trailering package). The green arrows on your instrument panel will flash whenever you signal aturn or lane change.Properly hooked up, the trailer lamps will also flash,telling other drivers you're aboutto turn, change lanes or stop. When towing a trailer, the green arrows on your instrument panel will flash for turnseven if the bulbs on the trailer are burned out. Thus, you may think drivers behind you are seeing your signal when they are not. It's important to check occasionally to sure the trailer be bulbs are still working. Driving On Grades Reduce speed and shift to a lower gear before you start down a long or steepdowngrade. 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. On a long uphill grade, shift down and reduce your speed to around 45 mph (70 km/h) to reduce the possibility of engine and transmission overheating. When towing at high altitude on steep uphill grades, consider the following: Engine coolant will boil at a lower temperature than at normal altitudes. If you turn your engine off immediately after towing at high altitude on steep uphill grades, your vehicle may show signs To similar to engine overheating. avoid this, let the engine run while parked (preferably on level ground) with the automatic transmission in PARK (P) for a few minutes before turning the engine off. If you do get the overheat warning, see "Engine Overheating" in the Index. 4-37