GMC 1995 Suburban Owner's Manual page 92

NOTICE:
After you've used the coolant heater, be sure to store the cord as
it was before to keep it away from moving engine parts. If you
don't, it could be damaged.
How long should you keep the coolant heater plugged in'? The answer
depends on the weather, the kind of oil you have, and some other things.
Instead of trying to list everything here, we ask that you contact your GM
dealer i n the area where you'll be parking your vehicle. The dealer can give
you the best advice for that particular area.
Automatic Transmission
There are several different positions for your shift lever.
If
Y O L I ~
vehicle is equipped with an automatic transmission, it now 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 the OFF
position, but not locked, there will be a small current drain on your battery
which could discharge your battery over a period of time. If you have a need
to leave your key in the ignition in the OFF position for an extended period
for any reason, it is recommended that
YOLI
disconnect the battery cable
from the battery to prevent discharging your battery.
0
PARK (P) -This
locks your rear wheels. It's the best position to use
when you start your engine because your vehicle can't move easily.
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