2002 GMC Savana Van Owner's Manual - Page 95

How long should you keep the coolant heater plugged in? The answer depends on the outside temperature, the kind of oil you have, and some other things. Instead of trying to list everything here, we ask that you contact your dealer in the area where you'll be parking your vehicle. The dealer can give you the best advice for that particular area. If you have a need to leave your key in the ignition in OFF for an extended period for any reason, it is recommended that you disconnect the battery cable from the battery to prevent discharging your battery. PARK (P): This position locks your rear wheels. It's the best position to use when you start your engine because your vehicle can't move easily. Automatic Transmission Operation CAUTION: It is dangerous to get out of your vehicle if the shift lever is not fully in PARK (P) with the parking brake firmly set. Your vehicle can roll. Don't leave your vehicle when the engine is running unless you have to. If you have 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). See "Shifting Into PARK (P)" in the Index. If you're pulling a trailer, see "Towing a Trailer" in the Index. There are several different positions for your shift lever. Your vehicle is equipped with an automatic transmission, and it features an electronic shift position indicator within the instrument cluster. This display must be powered anytime the shift lever is capable of being moved out of the PARK (P) position. This means that if your key is in OFF, but not locked, there will be a small current drain on your battery which could discharge your battery over a period of time. 2-24