1995 GMC Sonoma Owner's Manual - Page 73

Running Your Engine While You're Parked (Automatic Transmission) It's better not to park with the engine running. But if you ever haveto, here are some thingsto know. A CAUTION: Idling the engine with the air system control off could allow dangerous exhaust into your vehicle (seethe earlier Caution under '(Engine Exhaust"). Also, idling in a closed-in place can let deadlycarbon monoxide (CO)into your vehicle even ifthe fan switch isat the highest setting. One place this can happenis a garage. Exhaust - with CO - can come in easily. NEVER park in a garagewith the engine running. Another closed-in place can be a blizzard. (See "Blizzard" in the Index.) A CAUTION: It can be dangerous to out of your vehicle if the shift lever is get not fully in PARK (P) with the parking brakefirmly set. Your vehicle can roll. Don't leave your vehicle whenthe engine is running unless you have to. If you've left the engine running, the vehicle can move suddenly. You or otherscould beinjured. To be sure your vehicle won't move, even when you're on fairly level move the shift lever ground, always set your parking brake and to PARK (P). If you have four-wheel drive with a manual transfer case shift lever and your transfer caseis in NEUTRAL (N),your vehicle will be free toroll, even if your shift lever is in PARK (P). So, be sure the transfer case is in a drive gear - not in NEUTRAL (N). Alwaysset your parking brake. Follow the proper steps to be sure your vehiclewon't move. See "Shifting Into PARK (P)" in the Index. If you're pulling a trailer, see "Towing a Trailer" in the Index. 2-27