GMC T-Series 1999, Owner'S Manual

Page: 54 / 344

yellow blue
2-18
NOTICE:
Don’t allow the engine to operate at low idle for
more than five minutes. This can cause low
engine operating temperatures which can affect
engine operation and reduce engine life. Engine
idle speed should be increased to 1200 rpm
whenever extended idle is required. Once started,
the engine should be placed under load to allow
the engine coolant temperature to reach 150
_F
(66
_C) before shutting off the engine.
Engine Coolant Heater (If Equipped)
The plug for the heater is located below the front
crossmember, near the center.
In very cold weather, 0
_F (
-
18
_C) or colder, the engine
coolant heater can help. You’ll get easier starting and
better fuel economy during engine warm
-
up. Usually,
the coolant heater should be plugged in a minimum of
four hours prior to starting your vehicle.
To Use the Engine Coolant Heater
1. Turn off the engine.
2. Find the plug
-
in receptacle (either behind the front
bumper or in the component box).
3. Plug a heavy
-
duty, three
-
prong extension cord (rated
for at least 15 amps) into the vehicle’s plug
-
in
receptacle first. Then plug the extension cord into a
normal, grounded 110
-
volt AC outlet.
CAUTION:
Plugging the cord into an ungrounded outlet
could cause an electrical shock. Also, the wrong
kind of extension cord could overheat and cause
a fire. You could be seriously injured. Plug the
cord into a properly grounded three
-
prong
110
-
volt AC outlet. Use a heavy
-
duty three
-
prong
extension cord rated for at least 15 amps.
4. Before starting the engine, be sure to unplug
the cord.