3-42 GMC SIERRA 2003 User Guide

Coolant Surge Tank Pressure Cap
The coolant surge tank
pressure cap must be fully
installed on the coolant
surge tank.
Notice:Your pressure cap is a pressure-type cap
and must be tightly installed to prevent coolant loss
and possible engine damage from overheating.
See“Capacities and Specifications”for more
information.
Engine Overheating
You willfind a coolant temperature gage on your
vehicle’s instrument panel. SeeEngine Coolant
Temperature Gage on page 3-36. In addition, you will
find a LOW COOLANT, ENGINE OVERHEATED and a
REDUCED ENGINE POWER message in the DIC on
the instrument panel. SeeDriver Information Center
(DIC) on page 3-42.
Overheated Engine Protection
Operating Mode
If an overheated engine condition exists and the
REDUCED ENGINE POWER message is displayed, an
overheat protection mode which alternatesfiring
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. Driving
extended miles (km) and/or 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 system. See“Engine Oil”in the Index.
5-26
2003 - Sierra Denali

Cleaning the Windshield and Wiper Blades.........5-86
Cleaning Tires................................................5-87
Cleaning Vinyl................................................5-83
Cleaning Wood Panels....................................5-84
Climate Control System
Dual Automatic............................................3-18
Compact Disc Changer Errors..........................3-75
Compact Disc Messages..................................3-70
Compass Calibration.......................................2-30
Compass Variance..........................................2-29
Content Theft-Deterrent....................................2-13
Control of a Vehicle.......................................... 4-5
Coolant
Engine Temperature Gage............................3-36
Heater, Engine............................................2-18
Surge Tank Pressure Cap.............................5-26
Cooling System..............................................5-29
Cruise Control.................................................. 3-8
Cruise Control Light........................................3-40
Cupholder(s)..................................................2-39
Current and Past Model Order Forms................7-10
Customer Assistance Information
Courtesy Transportation
.................................. 7-7
Customer Assistance for Text Telephone (TTY)
Users
....................................................... 7-3
Customer Assistance Offices
........................... 7-4
Customer Satisfaction Procedure
..................... 7-2
GM Mobility Program for Persons with
Disabilities
................................................ 7-5
Reporting Safety Defects to General Motors
...... 7-9Customer Assistance Information (cont.)
Reporting Safety Defects to the Canadian
Government.............................................. 7-9
Reporting Safety Defects to the United States
Government.............................................. 7-8
Roadside Assistance Program......................... 7-5
Service Publications Ordering Information......... 7-9
D
Daytime Running Lamps..................................3-13
Defensive Driving............................................. 4-2
Defogging and Defrosting.................................3-22
Doing Your Own Service Work........................... 5-3
Dome Lamps .................................................3-16
Door
Locks.......................................................... 2-6
Power Door Locks......................................... 2-7
Programmable Automatic Door Locks............... 2-7
Rear Doors.................................................. 2-9
Driver
Position, Safety Belt.....................................1-12
DRIVER DOOR AJAR.....................................3-56
Driver Information Center (DIC).........................3-42
DIC Operation and Displays..........................3-42
DIC Warnings and Messages........................3-51
Driving
At Night.....................................................4-30
City ...........................................................4-35
Defensive..................................................... 4-2
4
2003 - Sierra Denali