GMC 2000 Sierra - Manual (Page 276)

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Four - Wheel - Drive vehicles must have the transfer case
in NEUTRAL (N). See “Four - Wheel Drive” in the
Index for the proper procedure to select the NEUTRAL
position for your vehicle. The towing limits for
four
- wheel - drive vehicles with wheel lift equipment:
D Front Towing -- 55 mph (88 km/h) or legal
speed limit and distance is unlimited
D Rear Towing -- 55 mph (88 km/h) for
50 miles (80 km).
Consult your dealer or a professional towing service if
you need to have your vehicle towed. See “Roadside
Assistance” in the Index.
Engine Overheating
You will find a coolant temperature gage on your
vehicle’s instrument panel. See “Engine Coolant
Temperature Gage” in the Index. In addition, you will
find a LOW COOLANT, CHECK COOLANT TEMP,
ENGINE OVERHEATED and a REDUCED ENGINE
POWER message in the message center on the
instrument panel. See “Message Center” in the Index.
Overheated Engine Protection Operating
Mode (V8 Engines Only)
Should an overheated engine condition exist and the
REDUCED ENGINE POWER message is displayed, an
overheat protection mode which alternates firing groups
of cylinders helps prevent engine damage. In this mode,
you will notice a loss in power and engine performance.
This operating mode allows your vehicle to be driven to
a safe place in an emergency. Towing a trailer in the
overheat protection mode should be avoided.
NOTICE:
After driving in the overheated engine protection
operating mode, to avoid engine damage, allow
the engine to cool before attempting any repair.
The engine oil will be severely degraded. Repair
the cause of coolant loss, change the oil and
reset the oil life monitor. See “Engine Oil” in
the Index.