2003 Pontiac Montana Owner's Manual - Page 149

Running Your Engine While You Are Parked It's better not to park with the engine running. But if you eve- "ave to, here are some things to kn I. It can be dangerous to get out of your vehicle if the shift lever is not fully PARK (P) with in the parking brake firmlyset. Your vehicle can roll. Don't leave your vehicle when the engine is running unless youhave to. If you've left the engine running, the vehicle can move suddenly. You or others could be injured. To be sure your vehicle won't move, even when you're on fairly level ground, always set your parking brake and move the shift lever to PARK (P). Idling the engine with the climate control system off could allow dangerous exhaust into your vehicle. See the earlier Caution under "Engine Exhaust." Also, idling in a closed-in place can let deadly carbon monoxide (CO) into your vehicle even if the fan is at the highest setting. One place this can happen is agarage. Exhaust - with CO - can come in easily. NEVER park in a garage with the engine running. Another closed-in place can be a blizzard. See "Winter Driving" in the Index. Follow the proper steps to be sure your vehicle won't move. See Shifting Into Park (P) on page 2-38. If you're pulling a trailer, see Towing a Trailer OD page 4-36. 2-42