1994 Buick LeSabre Owner's Manual - Page 88

Engine Exhaust Running Your Engine While You're Parked It's better not to park with the engine running. But if you ever have to, here are somethings to know. IA -- CAUTION: Idling the engine with the air system control 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 switch is at the highest setting. One place this can happen is a garage. 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 "Blizzard" in the Index.) -- 86