2007 GMC ENVOY heating

Service........................................................ 380
Accessories and Modications................... 380
California Proposition 65 Warning.............. 381
Doing Your Own Service Work.................. 381
Adding Equipment to the Outside of
Your Vehicle.......................................... 382
Fuel............................................................. 382
Gasoline Octane........................................ 382
Gasoline Specications.............................. 383
California Fuel........................................... 383
Additives................................................... 383
Fuels in Foreign Countries........................ 384
Filling the Tank......................................... 385
Filling a Portable Fuel Container............... 387
Checking Things Under the Hood.............. 388
Hood Release........................................... 388
Engine Compartment Overview.................. 390
Engine Oil................................................. 394
Engine Oil Life System.............................. 398
Engine Air Cleaner/Filter............................ 400
Automatic Transmission Fluid.................... 401
Engine Coolant.......................................... 405Radiator Pressure Cap.............................. 408
Engine Overheating................................... 408
Cooling System......................................... 411
Engine Fan Noise..................................... 416
Power Steering Fluid ................................. 417
Windshield Washer Fluid........................... 418
Brakes...................................................... 419
Battery...................................................... 422
Jump Starting............................................ 423
Rear Axle.................................................... 428
Four-Wheel Drive........................................ 428
Front Axle................................................... 429
Bulb Replacement....................................... 430
Halogen Bulbs........................................... 430
Headlamps................................................ 431
Front Turn Signal, Sidemarker and
Parking Lamps....................................... 432
Taillamps, Turn Signal, and Stoplamps...... 432
Back-Up Lamps......................................... 434
License Plate Lamp................................... 435
Replacement Bulbs................................... 435
Section 5 Service and Appearance Care
377

Notice:Use of the incorrect automatic
transmission uid may damage your vehicle,
and the damages may not be covered by
your warranty. Always use the automatic
transmission uid listed inRecommended
Fluids and Lubricants on page 517.
After adding uid, recheck the uid level as
described under “How to Check Automatic
Transmission Fluid,” earlier in this section.
When the correct uid level is obtained, push
the dipstick back in all the way; then ip the
handle down to lock the dipstick in place.
Engine Coolant
The cooling system in your vehicle is lled with
DEX-COOL®engine coolant. This coolant is
designed to remain in your vehicle for ve years or
150,000 miles (240 000 km), whichever occurs
rst, if you add only DEX-COOL
®extended
life coolant.
The following explains your cooling system and
how to add coolant when it is low. If you have
a problem with engine overheating, seeEngine
Overheating on page 408.A 50/50 mixture of clean, drinkable water and
DEX-COOL
®coolant will:
Give freezing protection down to
−34°F (−37°C).
Give boiling protection up to 265°F (129°C).
Protect against rust and corrosion.
Help keep the proper engine temperature.
Let the warning lights and gages work as
they should.
Notice:Using coolant other than DEX-COOL
®
may cause premature engine, heater core, or
radiator corrosion. In addition, the engine
coolant may require changing sooner,
at the rst maintenance service after each
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.
405

Add coolant mixture at the recovery tank, but be
careful not to spill it.
{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.
Occasionally check the coolant level in the
radiator. For information on how to add coolant to
the radiator, seeCooling System on page 411.
Radiator Pressure Cap
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.
SeeEngine Compartment Overview on page 390
for information on location.
Engine Overheating
You will nd a coolant temperature gage on your
vehicle’s instrument panel. SeeEngine Coolant
Temperature Gage on page 208for more
information.
If your vehicle has a Driver Information Center
(DIC), the display will show an Engine Coolant
Hot/Engine Overheated message. SeeDIC
Warnings and Messages on page 222for more
information.
408

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.
{CAUTION:
Poorly maintained and improperly used
tires are dangerous.
Overloading your vehicle’s tires can
cause overheating as a result of too
much friction. You could have an
air-out and a serious accident. See
Loading Your Vehicle on page 349.
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 vehicle’s tires are cold. See
Inflation - Tire Pressure on page 447.
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 the tire’s tread is badly worn, or
if your vehicle’s tires have been
damaged, replace them.
439

4. Press and release the switch to turn the air
inator on. The indicator light will remain on
when the inator is running.
The system has an internal clock to prevent
the system from overheating. The system
will allow about ve minutes of running time,
then the compressor will stop. The indicator
light will then begin to ash. When the indicator
is off, the inator can be started again by
pressing the switch. If the compressor is still
hot, it may only run for a short time before
shutting off again.
5. Press and release the switch to turn the
inator off.Place the inator kit tools in the pouch and store it
in its proper location. Remove the inator hose
from the outlet during loading and unloading. Load
leveling will not function with the inator hose
attached to the inator outlet. SeeElectronically
Controlled Air Suspension System on page 360for
more information.
To reinstall the cover, line up the tabs at the back
of the cover, put it in place and latch the tabs.
A continuous ashing indicator light may also
indicate a malfunction in the air suspension
system. SeeElectronically Controlled Air
Suspension System on page 360for more
information.
463

Engine (cont.)
Drive Belt Routing.................................... 520
Engine Compartment Overview................ 390
Exhaust................................................... 131
Fan Noise................................................ 416
Oil ........................................................... 394
Oil Life System........................................ 398
Overheating............................................. 408
Reduced Power Light............................... 215
Starting.................................................... 114
Entry Lighting.............................................. 183
Event Data Recorders (EDR)...................... 538
Exit Lighting................................................ 183
Extender, Safety Belt..................................... 41
F
Filter
Engine Air Cleaner................................... 400
Finish Damage............................................ 489
Fixed Mast Antenna.................................... 299
Flashers, Hazard Warning........................... 170
Flash-to-Pass.............................................. 173
Flat Tire...................................................... 464
Flat Tire, Changing...................................... 465Flat Tire, Storing......................................... 478
Fluid
Automatic Transmission............................ 401
Power Steering........................................ 417
Windshield Washer.................................. 418
Fog Lamps.................................................. 182
Four-Wheel Drive...............................122, 428
Front Axle................................................... 429
Fuel............................................................ 382
Additives.................................................. 383
California Fuel.......................................... 383
Check Gas Cap Light.............................. 217
Filling a Portable Fuel Container.............. 387
Filling Your Tank...................................... 385
Fuels in Foreign Countries....................... 384
Gage....................................................... 217
Gasoline Octane...................................... 382
Gasoline Specications............................ 383
Low Warning Light................................... 217
Fuses
Engine Compartment Fuse Block............. 493
Fuses and Circuit Breakers...................... 493
Rear Underseat Fuse Block..................... 499
Windshield Wiper..................................... 492
552