2005 GMC SIERRA DENALI overheating

The vehicle must be on a level surface. When your
engine is cold, the coolant level should be at the FULL
COLD mark.
If your vehicle is equipped with a low coolant sensor,
and the LOW COOLANT LEVEL message comes
on and stays on, it means you are low on engine
coolant. See “LOW COOLANT LEVEL” underDIC
Warnings and Messages on page 3-45.
Adding Coolant
If you need more coolant, add the proper DEX-COOL®
coolant mixtureat the surge tank, but only when the
engine is cool.
{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.
When replacing the pressure cap, make sure it is
hand-tight.
Coolant Surge Tank Pressure Cap
The coolant surge tank pressure cap must be fully
installed on the coolant surge tank. SeeEngine
Compartment Overview on page 5-12for more
information on location.
Notice:If the pressure cap is not tightly installed,
coolant loss and possible engine damage may occur.
Be sure the cap is properly and tightly secured.
Engine Overheating
You will nd a coolant temperature gage on your
vehicle’s instrument panel. SeeEngine Coolant
Temperature Gage on page 3-34.
In addition, you will nd an ENGINE OVERHEATED,
and a REDUCED ENGINE POWER message in
the Driver Information Center (DIC) on the instrument
panel. SeeDIC Warnings and Messages on page 3-45.
5-26

Tires
Your new vehicle comes with high-quality tires made by
a leading tire manufacturer. If you ever have questions
about your tire warranty and where to obtain service,
see your GM Warranty booklet for details. For additional
information refer to the tire manufacturer’s booklet
included with your vehicle’s Owner’s Manual.
{CAUTION:
Poorly maintained and improperly used tires
are dangerous.
Overloading your tires can cause
overheating as a result of too much
friction. You could have an air-out and a
serious accident. SeeLoading Your
Vehicle on page 4-42.
CAUTION: (Continued)
CAUTION: (Continued)

Underinated tires pose the same danger
as overloaded tires. The resulting accident
could cause serious injury. Check all tires
frequently to maintain the recommended
pressure. Tire pressure should be checked
when your tires are cold. SeeInflation - Tire
Pressure on page 5-62.
Overinated tires are more likely to be
cut, punctured or broken by a sudden
impact —such as when you hit a pothole.
Keep tires at the recommended pressure.
Worn, old tires can cause accidents. If your
tread is badly worn, or if your tires have
been damaged, replace them.
20-Inch Tires
If your vehicle has the optional 20-inch P275/55R20
size tires, they are classied as touring tires and
are designed for on road use. The low-prole, wide
tread design is not recommended for “off-road” driving.
SeeOperating Your All-Wheel-Drive Vehicle Off
Paved Roads on page 4-13, for additional information.
5-56

Engine
Air Cleaner/Filter.........................................5-19
Battery.......................................................5-40
Check and Service Engine Soon Light............3-36
Coolant......................................................5-24
Coolant Heater............................................2-19
Coolant Temperature Gage...........................3-34
Engine Compartment Overview......................5-12
Exhaust.....................................................2-27
Fan Noise..................................................5-34
Oil .............................................................5-14
Overheated Protection Operating Mode...........5-28
Overheating................................................5-26
Starting......................................................2-18
Entry Lighting.................................................3-17
Event Data Recorders (EDR)............................. 7-9
Exit Lighting...................................................3-17
Extender, Safety Belt.......................................1-26
F
Filter
Engine Air Cleaner......................................5-19
Finish Damage...............................................5-99
Fixed Mast Antenna........................................3-94
Flash-to-Pass................................................... 3-9Flat Tire........................................................5-71
Flat Tire, Changing.........................................5-72
Flat Tire, Storing.............................................5-87
Fluid
Automatic Transmission................................5-21
Power Steering...........................................5-34
Windshield Washer......................................5-36
Fog Lamps....................................................3-16
Front Axle......................................................5-48
Front Reading Lamps......................................3-18
Fuel............................................................... 5-5
Additives...................................................... 5-6
California Fuel.............................................. 5-6
Filling a Portable Fuel Container..................... 5-9
Filling Your Tank........................................... 5-7
Fuels in Foreign Countries.............................. 5-7
Gage.........................................................3-41
Gasoline Octane........................................... 5-5
Gasoline Specications.................................. 5-5
Low Warning Light.......................................3-41
Fuses
Center Instrument Panel Fuse Block.............5-106
Fuses and Circuit Breakers.........................5-102
Instrument Panel Fuse Block.......................5-103
Underhood Fuse Block...............................5-107
Windshield Wiper.......................................5-102
5