2008 CHEVROLET TAHOE oil temperature

If you get the ENGINE OVERHEATED STOP ENGINE
or the ENGINE OVERHEATED IDLE ENGINE message
with no sign of steam, try this for a minute or so:
1. If the vehicle has an air conditioner and it is on,
turn it off.
2. Turn on the heater to the highest temperature and
at the highest fan speed and open the windows as
necessary.
3. In heavy traffic, let the engine idle in N (Neutral)
while stopped. If it is safe to do so, pull off the
road, shift to P (Park) or N (Neutral) and let
the engine idle.
If you no longer have the overheat warning, you can
drive. Just to be safe, drive slower for about 10 minutes.
If the warning does not come back on, you can drive
normally.
If the warning continues, pull over, stop, and park your
vehicle immediately.
If there is still no sign of steam and your vehicle has an
engine-driven cooling fan, push down the accelerator
until the engine speed is about twice as fast as normal
idle speed for at least ve minutes while parked.
If there is still no sign of steam and your vehicle has an
electric cooling fan, idle the engine for ve minutes
while parked.If you still have the warning, turn off the engine and get
everyone out of the vehicle until it cools down. Also,
see “Overheated Engine Protection Operating Mode”
later in this section.
You might decide not to lift the hood but to get service
help right away.
Overheated Engine Protection
Operating Mode
If an overheated engine condition exists and the
ENGINE POWER IS REDUCED message is displayed,
an overheat protection mode which alternates ring
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. SeeEngine Oil
on page 5-17.
5-36

Fuses Usage
20 Fuel Pump
21 Fuel System Control Module
22 Headlamp Washer
23 Rear Windshield Washer
24Fuel Injectors, Ignition Coils
(Left Side)
25 Trailer Park Lamps
26 Driver Side Park Lamps
27 Passenger Side Park Lamps
28 Fog Lamps
29 Horn
30Passenger Side High-Beam
Headlamp
31 Daytime Running Lamps (DRL)
32 Driver Side High-Beam Headlamp
33 Daytime Running Lamps 2
34 Sunroof
35Key Ignition System, Theft Deterrent
SystemFuses Usage
36 Windshield Wiper
37 SEO B2 Uptter Usage (Battery)
38 Electric Adjustable Pedals
39 Climate Controls (Battery)
40 Airbag System (Ignition)
41 Amplier
42 Audio System
43Miscellaneous (Ignition),
Cruise Control
44 Liftgate Release
45 Airbag System (Battery)
46 Instrument Panel Cluster
47 Power Take-Off
48Auxiliary Climate Control (Ignition),
Temperature Mirror
49Center High-Mounted
Stoplamp (CHMSL)
50 Rear Defogger
51 Heated Mirrors
5-124

More frequent lubrication may be required when
exposed to a corrosive environment. Applying silicone
grease on weatherstrips with a clean cloth will make
them last longer, seal better, and not stick or squeak.
(g)Check vent hose at transfer case for kinks and
proper installation. Check to be sure vent hose is
unobstructed, clear, and free of debris. During any
maintenance, if a power washer is used to clean mud
and dirt from the underbody, care should be taken to
not directly spray the transfer case output seals. High
pressure water can overcome the seals and contaminate
the transfer case fluid. Contaminated fluid will decrease
the life of the transfer case and should be replaced.
(h)Change automatic transmission fluid and filter if the
vehicle is mainly driven under one or more of these
conditions:
In heavy city traffic where the outside temperature
regularly reaches 90°F (32°C) or higher.
In hilly or mountainous terrain.
When doing frequent trailer towing.
Uses such as found in taxi, police, or delivery
service.(i)Drain, flush, and refill cooling system. This service
can be complex; you should have your dealer/retailer
perform this service. See Engine Coolant on page 5-31
for what to use. Inspect hoses. Clean radiator,
condenser, pressure cap, and filler neck. Pressure
test the cooling system and pressure cap.
(j)A fluid loss in any vehicle system could indicate a
problem. Have the system inspected and repaired and
the fluid level checked. Add fluid if needed.
(k)Inspect system. Check all fuel and vapor lines
and hoses for proper hook-up, routing, and condition.
Check that the purge valve works properly, if equipped.
Replace as needed.
(l)If you drive regularly under dusty conditions, inspect
the filter at each engine oil change.
(m)Visually inspect belt for fraying, excessive cracks, or
obvious damage. Replace belt if necessary.
(n)Severe Service: Change transfer case fluid if the
vehicle is mainly used for trailer towing or driven in city
traffic, wet environment, or high ambient temperatures.
6-9

Disc, MP3.............................................3-95, 3-99
Doing Your Own Service Work........................... 5-4
Dome Lamp Override......................................3-19
Dome Lamps .................................................3-18
Door
Delayed Locking..........................................2-11
Locks........................................................2-10
Power Door Locks.......................................2-10
Programmable Automatic Door Locks.............2-11
Rear Door Security Locks.............................2-11
Driver Information Center (DIC).........................3-51
DIC Operation and Displays..................3-51, 3-56
DIC Vehicle Customization............................3-67
DIC Warnings and Messages........................3-59
Driving
At Night.....................................................4-26
Before a Long Trip......................................4-28
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Highway Hypnosis.......................................4-28
Hill and Mountain Roads..............................4-29
In Rain and on Wet Roads...........................4-26
Off-Road ....................................................4-13
Recovery Hooks..........................................4-34
Rocking Your Vehicle to Get it Out.................4-34
Winter........................................................4-30
Dual Automatic Climate Control System.............3-24
DVD
Rear Seat Entertainment System..................3-105E
EDR .............................................................7-17
Electrical System
Add-On Equipment.....................................5-119
Center Instrument Panel Fuse Block.............5-121
Fuses and Circuit Breakers.........................5-119
Instrument Panel Fuse Block.......................5-120
Power Windows and Other Power Options....5-119
Underhood Fuse Block...............................5-122
Windshield Wiper Fuses.............................5-119
Electronic Immobilizer
PASS-Key
®III+...........................................2-22
Electronic Immobilizer Operation
PASS-Key
®III+...........................................2-23
Engine
Air Cleaner/Filter.........................................5-22
Check and Service Engine Soon Light............3-44
Coolant......................................................5-31
Coolant Heater............................................2-28
Coolant Temperature Gage...........................3-43
Drive Belt Routing.......................................6-16
Engine Compartment Overview......................5-16
Exhaust.....................................................2-46
Fan Noise..................................................5-41
Oil .............................................................5-17
Oil Life System...........................................5-20
Overheated Protection Operating Mode...........5-36
Overheating................................................5-34
Starting......................................................2-26
4

Entry Lighting.................................................3-19
Event Data Recorders.....................................7-17
Exit Lighting...................................................3-19
Extender, Safety Belt.......................................1-50
Exterior Lamps...............................................3-14
F
Filter
Engine Air Cleaner......................................5-22
Finish Damage.............................................5-116
Flashers, Hazard Warning.................................. 3-6
Flash-to-Pass................................................... 3-8
Flat Tire........................................................5-89
Flat Tire, Changing.........................................5-90
Flat Tire, Storing...........................................5-105
Fluid
Automatic Transmission........................5-24, 5-27
Power Steering...........................................5-42
Windshield Washer......................................5-43
Fog Lamp
Fog ...........................................................3-17
Fog Lamp Light..............................................3-48
Four-Wheel Drive....................................2-36, 5-55
Front Axle......................................................5-56
Fuel............................................................... 5-5
Additives...................................................... 5-7
California Fuel.............................................. 5-6
E85 (85% Ethanol)........................................ 5-8Fuel (cont.)
Filling a Portable Fuel Container....................5-13
Filling the Tank...........................................5-10
Fuels in Foreign Countries.............................. 5-9
Gage .........................................................3-49
Gasoline Octane........................................... 5-6
Gasoline Specications.................................. 5-6
Low Warning Light.......................................3-50
Running Out of...........................................2-46
Fuses
Center Instrument Panel Fuse Block.............5-121
Fuses and Circuit Breakers.........................5-119
Instrument Panel Fuse Block.......................5-120
Underhood Fuse Block...............................5-122
Windshield Wiper.......................................5-119
GGage
Engine Coolant Temperature.........................3-43
Fuel..........................................................3-49
Oil Pressure...............................................3-47
Speedometer..............................................3-36
Tachometer.................................................3-36
Voltmeter Gage...........................................3-40
Garage Door Opener.......................................2-62
Gasoline
Octane........................................................ 5-6
Specications............................................... 5-6
Glove Box.....................................................2-70
GM Mobility Reimbursement Program.................. 7-7
5

M
Maintenance Schedule
Additional Required Services........................... 6-6
At Each Fuel Fill.........................................6-10
At Least Once a Month................................6-10
At Least Once a Year..................................6-11
Introduction.................................................. 6-2
Maintenance Footnotes.................................. 6-8
Maintenance Record....................................6-17
Maintenance Replacement Parts....................6-15
Maintenance Requirements............................. 6-2
Owner Checks and Services.........................6-10
Recommended Fluids and Lubricants.............6-13
Scheduled Maintenance................................. 6-4
Using.......................................................... 6-3
Your Vehicle and the Environment................... 6-2
Malfunction Indicator Light................................3-44
Manual Lumbar Controls.................................... 1-4
Manual Seats................................................... 1-2
Manual, Using.................................................... iv
Memory Seat, Mirrors, and Pedals...................... 1-6
Message
DIC Warnings and Messages........................3-59
Mirrors
Automatic Dimming Rearview with Compass
and Temperature Display...........................2-49
Automatic Dimming Rearview with OnStar
®,
Compass and Temperature Display.............2-47
Outside Automatic Dimming Mirror.................2-55Mirrors (cont.)
Outside Convex Mirror.................................2-55
Outside Heated Mirrors................................2-56
Outside Manual Mirrors................................2-52
Outside Power Foldaway Mirrors....................2-54
Outside Power Mirrors..................................2-53
Outside Towing Mirrors.................................2-52
Park Tilt.....................................................2-55
MP3 .....................................................3-95, 3-99
MyGMLink.com................................................ 7-5
N
Navigation System, Privacy..............................7-18
Navigation/Radio System, see
Navigation Manual.....................................3-105
New Vehicle Break-In......................................2-24
O
Odometer......................................................3-36
Odometer, Trip...............................................3-36
Off-Road Driving.............................................4-13
Off-Road Recovery..........................................4-11
Oil
Engine.......................................................5-17
Pressure Gage............................................3-47
Pressure Light.............................................3-48
Oil, Engine Oil Life System..............................5-20
8