2007 CHEVROLET TRAIL BLAZER heater

The coolant level should
be at least up to 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
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.If there seems to be no leak, start the engine
again. The engine cooling fan speed should
increase when idle speed is doubled by pushing
the accelerator pedal down. If it does not,
your vehicle needs service. Turn off the engine.
Notice:Engine damage from running your
engine without coolant is not covered by
your warranty.
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.
421

How to Add Coolant to the Coolant
Recovery Tank
If you have not found a problem yet, but the
coolant level is not at the FULL COLD mark,
add a 50/50 mixture of clean, drinkable water
and DEX-COOL
®engine coolant at the coolant
recovery tank. SeeEngine Coolant on page 414
for more information.
{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 DEX-COOL
®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.
When the coolant in the coolant recovery tank is
at the FULL COLD mark, start your vehicle.
422

Cleaning (cont.)
Climate Control System
Dual......................................................... 187
Dual Automatic......................................... 190
Outlet Adjustment..................................... 195
Rear........................................................ 196
Clock.......................................................... 239
Collision Damage Repair............................. 549
Comfort Guides, Rear Safety Belt................. 37
Compass..........................133, 135, 138, 140
Competitive Driving..................................... 323
Content Theft-Deterrent............................... 108
Control of a Vehicle..................................... 310
Convenience Net......................................... 164
Coolant
Engine Temperature Gage........................ 211
Heater, Engine......................................... 116
Cooling System........................................... 420
Cruise Control............................................. 177
Cruise Control Light.................................... 217
Customer Assistance Information
Courtesy Transportation........................... 546
Customer Assistance for Text
Telephone (TTY) Users......................... 542
Customer Assistance Offices.................... 542
Customer Satisfaction Procedure.............. 538Customer Assistance Information (cont.)
GM Mobility Reimbursement Program...... 543
Reporting Safety Defects to General
Motors.................................................. 553
Reporting Safety Defects to the
Canadian Government.......................... 553
Reporting Safety Defects to the
United States Government.................... 552
Roadside Assistance Program.................. 544
Service Publications Ordering
Information........................................... 554
D
Daytime Running Lamps............................. 181
Defensive Driving........................................ 306
Delayed Locking.......................................... 100
Disc, MP3................................................... 274
Doing Your Own Service Work.................... 387
Dome Lamp Override.................................. 184
Dome Lamps............................................... 183
Door
Delayed Locking...................................... 100
Locks......................................................... 98
Power Door Locks..................................... 99
Programmable Automatic Door Locks....... 100
Rear Door Security Locks........................ 103
562

Driver
Position, Safety Belt................................... 25
Driver Information Center (DIC)................... 220
DIC Operation and Displays..................... 221
DIC Vehicle Customization....................... 231
DIC Warnings and Messages................... 224
Driving
At Night................................................... 339
City.......................................................... 344
Defensive................................................. 306
Drunken................................................... 307
Freeway................................................... 345
Hill and Mountain Roads.......................... 348
In Rain and on Wet Roads...................... 340
Off-Road.................................................. 323
Recovery Hooks....................................... 355
Rocking Your Vehicle to Get it Out.......... 354
Winter...................................................... 350
Dual Automatic Climate Control System....... 190
Dual Climate Control System....................... 187
DVD
Rear Seat Entertainment System............. 284E
EDR ............................................................ 555
Electrical System
Add-On Equipment................................... 502
Engine Compartment Fuse Block............. 503
Fuses and Circuit Breakers...................... 503
Headlamps............................................... 502
Power Windows and Other Power
Options................................................. 502
Rear Underseat Fuse Block..................... 509
Windshield Wiper Fuses........................... 502
Electronically Controlled Air Suspension
System.................................................... 367
Engine
Air Cleaner/Filter...................................... 410
Change Engine Oil Light.......................... 216
Check and Service Engine Soon Light..... 212
Coolant.................................................... 414
Coolant Heater......................................... 116
Coolant Temperature Gage...................... 211
Drive Belt Routing.................................... 533
Engine Compartment Overview................ 396
Exhaust................................................... 130
Fan Noise................................................ 425
Oil ........................................................... 402
Oil Life System........................................ 408
563

G
Gage
Check Gages Warning Light..................... 218
Engine Coolant Temperature.................... 211
Fuel......................................................... 219
Oil Pressure............................................. 215
Speedometer........................................... 200
Tachometer.............................................. 201
Voltmeter Gage........................................ 207
Garage Door Opener................................... 150
Gasoline
Octane..................................................... 388
Specications........................................... 389
Gate Ajar Light............................................ 218
Glove Box................................................... 161
GM Mobility Reimbursement Program.......... 543
H
Hazard Warning Flashers............................ 172
Head Restraints............................................ 17
Headlamps.................................................. 180
Bulb Replacement.................................... 442
Daytime Running Lamps.......................... 181
Electrical System..................................... 502
Flash-to-Pass........................................... 175
Halogen Bulbs......................................... 442Headlamps (cont.)
High/Low Beam Changer......................... 175
On Reminder........................................... 181
Heated Seats................................................ 11
Heater......................................................... 187
Heater......................................................... 190
Highbeam On Light..................................... 217
High-Speed Operation, Tires........................ 458
Highway Hypnosis....................................... 347
Hill and Mountain Roads............................. 348
Hood
Checking Things Under............................ 394
Release................................................... 394
Horn............................................................ 172
How to Use This Manual................................ 4
How to Wear Safety Belts Properly............... 25
I
Ignition Positions......................................... 112
Infants and Young Children, Restraints.......... 44
Ination - Tire Pressure............................... 457
Instrument Panel
Overview.................................................. 170
Instrument Panel (I/P)
Brightness................................................ 183
Cluster..................................................... 199
565