engine overheat GMC SIERRA 2007 Owner's Guide

Cooling System
If your vehicle has the DURAMAX®Diesel engine,
see the DURAMAX®Diesel manual for more
information.
When you decide it is safe to lift the hood, here is
what you will see:
A. Coolant Surge Tank
B. Coolant Surge Tank Pressure Cap
C. Engine Cooling Fan
{CAUTION:
An electric engine cooling fan can start
even when the engine is not running.
To avoid injury, always keep hands,
clothing, and tools away from any engine
cooling fan.
If the coolant inside the coolant surge tank is
boiling, do not do anything else until it cools down.
The vehicle should be parked on a level surface.
Check the coolant level after the system cools
down. Some amount of coolant may be lost due
to overheating.
5.3L Engine (4.3L, 4.8L and 6.0L Similar)
520

The coolant level should be at or above the FULL
COLD mark. If it is not, you may have a leak at
the pressure cap or in the radiator hoses,
heater hoses, radiator, water pump, or somewhere
else in the cooling system.
{CAUTION:
Heater and radiator hoses, and other
engine parts, can be very hot. Do not
CAUTION: (Continued)
CAUTION: (Continued)
touch them. If you do, you can be burned.
Do not run the engine if there is a leak. If
you run the engine, it could lose all
coolant. That could cause an engine re,
and you could be burned. Get any leak
xed before you drive the vehicle.
Notice:Engine damage from running your
engine without coolant is not covered by your
warranty. SeeOverheated Engine Protection
Operating Mode (V8 Engines Only) on page 519
for information on driving to a safe place in
an emergency.
Notice:Using coolant other than DEX-COOL
®
may cause premature engine, heater core,
or radiator corrosion. In addition, the engine
coolant could require changing sooner, at
30,000 miles (50 000 km) or 24 months,
whichever occurs rst. Any repairs would not
be covered by your warranty. Always use
DEX-COOL
®(silicate-free) coolant in your
vehicle.
521

{CAUTION:
Adding only plain water to your cooling
system can be dangerous. Plain water, or
some other liquid such as alcohol, can
boil before the proper coolant mixture will.
Your vehicle’s coolant warning system is
set for the proper coolant mixture. With
plain water or the wrong mixture, your
engine could get too hot but you would
not get the overheat warning. Your engine
could catch re and you or others could
be burned. Use a 50/50 mixture of clean,
drinkable water and a proper coolant.
Notice:In cold weather, water can freeze and
crack the engine, radiator, heater core and
other parts. Use the recommended coolant and
the proper coolant mixture.
{CAUTION:
You can be burned if you spill coolant on
hot engine parts. Coolant contains
ethylene glycol and it will burn if the
engine parts are hot enough. Do not spill
coolant on a hot engine.
1. Remove the coolant
surge tank pressure
cap when the
cooling system,
including the coolant
surge tank
pressure cap and
upper radiator hose,
is no longer hot.
Turn the pressure cap slowly counterclockwise
about one full turn. If you hear a hiss, wait
for that to stop. A hiss means there is
still some pressure left.
523

How to Check
Use a good quality pocket-type gage to check tire
pressure. You cannot tell if your tires are
properly inated simply by looking at them. Radial
tires may look properly inated even when
they’re underinated. Check the tire’s ination
pressure when the tires are cold. Cold means your
vehicle has been sitting for at least three hours
or driven no more than 1 mile (1.6 km).
Remove the valve cap from the tire valve stem.
Press the tire gage rmly onto the valve to
get a pressure measurement. If the cold tire
ination pressure matches the recommended
pressure on the Tire and Loading Information
label, no further adjustment is necessary. If the
ination pressure is low, add air until you reach the
recommended amount.
If you overll the tire, release air by pushing on
the metal stem in the center of the tire valve.
Recheck the tire pressure with the tire gage.
Be sure to put the valve caps back on the valve
stems. They help prevent leaks by keeping out dirt
and moisture.
Dual Tire Operation
When the vehicle is new, or whenever a wheel,
wheel bolt or wheel nut is replaced, check the
wheel nut torque after 100, 1,000 and 6,000 miles
(160, 1 600 and 10 000 km) of driving. For proper
torque and wheel nut tightening information, see
Removing the Spare Tire and Tools on page 578.
The outer tire on a dual wheel setup generally
wears faster than the inner tire. Your tires will wear
more evenly and last longer if you rotate the
tires periodically, seeTire Inspection and Rotation
on page 565. Also seeScheduled Maintenance
(Gasoline Engine) on page 623.
{CAUTION:
If you operate your vehicle with a tire that
is badly underinated, the tire can
overheat. An overheated tire can lose air
suddenly or catch re. You or others
could be injured. Be sure all tires
(including the spare) are properly inated.
SeeInation - Tire Pressure on page 559, for
information on proper tire ination.
560

Door (cont.)
Rear Door Security Locks........................ 120
Rear Doors.............................................. 121
Driver
Position, Safety Belt................................... 28
Driver Information Center (DIC)................... 267
DIC Operation and Displays............268, 275
DIC Vehicle Customization....................... 289
DIC Warnings and Messages................... 279
Driving
At Night................................................... 407
City.......................................................... 412
Defensive................................................. 374
Drunken................................................... 375
Freeway................................................... 413
Hill and Mountain Roads.......................... 416
In Rain and on Wet Roads...................... 408
Off-Road.................................................. 390
Recovery Hooks....................................... 424
Rocking Your Vehicle to Get it Out.......... 423
Winter...................................................... 418
Dual Automatic Climate Control System....... 238
Dual Tire Operation..................................... 560
DVD
Rear Seat Entertainment System............. 355E
Electrical System
Add-On Equipment................................... 608
Center Instrument Panel Fuse Block........ 611
Fuses and Circuit Breakers...................... 608
Instrument Panel Fuse Block................... 609
Power Windows and Other Power
Options................................................. 608
Underhood Fuse Block............................. 612
Windshield Wiper Fuses........................... 608
Engine
Air Cleaner/Filter...................................... 505
Check and Service Engine Soon Light..... 260
Coolant.................................................... 513
Coolant Heater......................................... 136
Coolant Temperature Gage...................... 258
Drive Belt Routing.................................... 639
Engine Compartment Overview................ 498
Exhaust................................................... 167
Fan Noise................................................ 525
Oil ........................................................... 500
Oil Life System........................................ 503
Overheated Protection Operating Mode.... 519
Overheating............................................. 516
Starting.................................................... 134
Entry Lighting.............................................. 226
669

N
Navigation/Radio System, see Navigation
Manual..................................................... 355
New Vehicle Break-In.................................. 132
Noise Control System, Tampering................ 542
Normal Maintenance Replacement Parts..... 638
O
Odometer.................................................... 248
Odometer, Trip............................................ 248
Off-Road Driving.......................................... 390
Off-Road Recovery...................................... 387
Oil
Engine..................................................... 500
Pressure Gage......................................... 263
Pressure Light.......................................... 264
Oil, Engine Oil Life System......................... 503
Older Children, Restraints............................. 45
Online Owner Center................................... 647
OnStar
®System, see OnStar®Manual........ 180
Operation, Universal Home Remote
System............................................185, 189
Other Warning Devices................................ 211
Outlet Adjustment........................................ 245Outlets
Accessory Power..................................... 232
Outside
Manual Mirrors......................................... 174
Power Foldaway Mirrors........................... 177
Power Mirrors.......................................... 176
Trailer-Tow Mirrors................................... 175
Overheated Engine Protection
Operating Mode....................................... 519
Owner Checks and Services....................... 631
Owners, Canadian.......................................... 3
P
Paint, Damage............................................ 605
Park Aid...................................................... 228
Park (P)
Shifting Into............................................. 163
Shifting Out of......................................... 165
Parking
Assist....................................................... 228
Brake....................................................... 162
Over Things That Burn............................ 166
Passenger Airbag Status Indicator............... 252
Passenger Sensing System........................... 97
Passing....................................................... 387
674