radiator GMC ENVOY 1999 User Guide

yellowblue
6-21
Radiator Pressure Cap
NOTICE:
Your radiator cap is a 15 psi (105 kPa)
pressure
-type cap and must be tightly installed to
prevent coolant loss and possible engine damage
from overheating. Be sure the arrows on the cap
line up with the overflow tube on the radiator
filler neck.
Thermostat
Engine coolant temperature is controlled by a thermostat
in the engine coolant system. The thermostat stops the
flow of coolant through the radiator until the coolant
reaches a preset temperature.
Engine Coolant
The cooling system in your vehicle is filled with
DEX
-COOL engine coolant. This coolant is designed
to remain in your vehicle for 5 years or 150,000 miles
(240 000 km), whichever occurs first, 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, see ªEngine Overheatingº in
the Index.
A 50/50 mixture of clean, drinkable water and
DEX
-COOL coolant will:

Give freezing protection down to
-34F (-37C).

Give boiling protection up to 265F (129C).

Protect against rust and corrosion.

Help keep the proper engine temperature.

Let the warning lights and gages work as
they should.
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yellowblue
6-22
NOTICE:
When adding coolant, it is important that you use
only DEX
-COOL
(silicate-free) coolant.
If coolant other than DEX-COOL is added to the
system, premature engine, heater core or
radiator corrosion may result. In addition, the
engine coolant will require change sooner
-- at
30,000 miles (50 000 km) or 24 months,
whichever occurs first. Damage caused by the use
of coolant other than DEX
-COOL
is not
covered by your new vehicle warranty.
What to Use
Use a mixture of one-half clean, drinkable water and
one
-half DEX-COOL
coolant which won't damage
aluminum parts. If you use this coolant mixture, you
don't need to add anything else.
CAUTION:
Adding only plain water to your cooling system
can be dangerous. Plain water, or some other
liquid like 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 wouldn't
get the overheat warning. Your engine could
catch fire and you or others could be burned. Use
a 50/50 mixture of clean, drinkable water and
DEX
-COOL
coolant.
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yellowblue
6-23
NOTICE:
If you use an improper coolant mixture, your
engine could overheat and be badly damaged.
The repair cost wouldn't be covered by your
warranty. Too much water in the mixture can
freeze and crack the engine, radiator, heater core
and other parts.
If you have to add coolant more than four times a year,
have your dealer check your cooling system.
NOTICE:
If you use the proper coolant, you don't have to
add extra inhibitors or additives which claim to
improve the system. These can be harmful.
Checking Coolant
The vehicle must be on a level surface. When your
engine is cold, the coolant level should be at ADD, or a
little higher. When your engine is warm, the level should
be up to FULL HOT, or a little higher.
Adding Coolant
If you need more coolant, add the proper DEX
-COOL

coolant mixture at the coolant recovery tank.
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yellowblue
6-24
CAUTION:
Turning the radiator pressure cap when the
engine and radiator are hot can allow steam and
scalding liquids to blow out and burn you badly.
With the coolant recovery tank, you will almost
never have to add coolant at the radiator.
Never turn the radiator pressure cap
-- even a
little
-- when the engine and radiator are hot.
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. Don't spill coolant on a hot engine.
Power Steering Fluid
When to Check Power Steering Fluid
It is not necessary to regularly check power steering
fluid unless you suspect there is a leak in the system or
you hear an unusual noise. A fluid loss in this system
could indicate a problem. Have the system inspected
and repaired.
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Short Trip/City Scheduled Maintenance
yellowblue
7-26
100,000 Miles (166 000 km)

Inspect spark plug wires.
An Emission Control Service.

Replace spark plugs.
An Emission Control Service.

If you haven't used your vehicle under severe service conditions listed
previously and, therefore, haven't changed your automatic transmission fluid,
change both the fluid and filter.

Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
150,000 Miles (240 000 km)

Drain, flush and refill cooling system (or every 60 months since last service,
whichever occurs first). See ªEngine Coolantº in the Index for what to use.
Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test
cooling system and pressure cap.
An Emission Control Service.
ACTUAL
SERVICED BY:MILEAGE
DATE
ACTUAL
SERVICED BY:MILEAGE
DATE
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Long Trip/Highway Scheduled Maintenance
yellowblue
7-38
100,000 Miles (166 000 km)

Inspect spark plug wires.
An Emission Control Service.

Replace spark plugs.
An Emission Control Service.

If you haven't used your vehicle under severe service conditions listed
previously and, therefore, haven't changed your automatic transmission fluid,
change both the fluid and filter.

Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
150,000 Miles (240 000 km)

Drain, flush and refill cooling system (or every 60 months since last service,
whichever occurs first). See ªEngine Coolantº in the Index for what to use.
Inspect hoses. Clean radiator, condenser, pressure cap and neck. Pressure test
the cooling system and pressure cap.
An Emission Control Service.
ACTUAL
SERVICED BY:MILEAGE
DATE
ACTUAL
SERVICED BY:MILEAGE
DATE
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yellowblue
7-43
Part C: Periodic Maintenance
Inspections
Listed in this part are inspections and services which
should be performed at least twice a year (for instance,
each spring and fall). You should let your dealer's
service department or other qualified service center do
these jobs. Make sure any necessary repairs are
completed at once.
Proper procedures to perform these services may be
found in a service manual. See ªService and Owner
Publicationsº in the Index.
Steering, Suspension and Front Drive Axle
Boot and Seal Inspection
Inspect the front and rear suspension and steering
system for damaged, loose or missing parts, signs of
wear or lack of lubrication. Inspect the power steering
lines and hoses for proper hook
-up, binding, leaks,
cracks, chafing, etc. Clean and then inspect the drive
axle boot seals for damage, tears or leakage. Replace
seals if necessary.
Exhaust System Inspection
Inspect the complete exhaust system. Inspect the body
near the exhaust system. Look for broken, damaged,
missing or out
-of-position parts as well as open seams,
holes, loose connections or other conditions which could
cause a heat build
-up in the floor pan or could let
exhaust fumes into the vehicle. See ªEngine Exhaustº in
the Index.
Engine Cooling System Inspection
Inspect the hoses and have them replaced if they are
cracked, swollen or deteriorated. Inspect all pipes,
fittings and clamps; replace as needed. Clean the outside
of the radiator and air conditioning condenser. To help
ensure proper operation, a pressure test of the cooling
system and pressure cap is recommended at least once
a year.
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9-7
OnStar
System 2-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Your Vehicle Off Paved Roads 4-15 . . . . . . . . . . . .
Ordering Owner and Service Publications 8-12, 8-13 . . . . . . .
Outside Mirror
Convex 2
-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heated 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Folding 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Remote Control 2-45 . . . . . . . . . . . . . . . . . . . . . . . . .
Overhead Console 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overheating Engine 5-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Owner Checks and Services 7-39 . . . . . . . . . . . . . . . . . . . . . . .
Owner Publications 8-12, 8-13 . . . . . . . . . . . . . . . . . . . . . . . .
Paint Spotting, Chemical 6-52 . . . . . . . . . . . . . . . . . . . . . . . .
Park 2-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shifting Into 2-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shifting Out of 2-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking
At Night 2
-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake Mechanism Check 7-42 . . . . . . . . . . . . . . . . . . . . . . .
Lots 2-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Hills with a Trailer 4-52 . . . . . . . . . . . . . . . . . . . . . . . . .
Over Things That Burn 2-29 . . . . . . . . . . . . . . . . . . . . . . . .
Passing 4-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Passlock
2-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Payload 4-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Periodic Maintenance Inspections 7-43 . . . . . . . . . . . . . . . . . .
Power
Accessory Outlets 2
-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Locks 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Control Mirror 2-45 . . . . . . . . . . . . . . . . . . . . . . . .
Seat 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steering 4
-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steering Fluid 6-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windows 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Folding Mirrors 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pregnancy, Use of Safety Belts 1-19 . . . . . . . . . . . . . . . . . . . .
Problems on the Road 5-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Publications, Service and Owner 8-12, 8-13 . . . . . . . . . . . . . .
Radiator, Adding Coolant 5-15 . . . . . . . . . . . . . . . . . . . . . . .
Radiator Pressure Cap 6-21 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radio Reception 3-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radios
Cassette Tape Player 3
-8 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cassette Tape Player Care 3-25, 7-39 . . . . . . . . . . . . . . . . .
CD Changer 3-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Player 3-12 . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Player Care 3-27 . . . . . . . . . . . . . . . . . . . . . .
Rear Seat Audio 3-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Clock 3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theft-Deterrent Feature 3-21 . . . . . . . . . . . . . . . . . . . . . . . .
Rain, Driving 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RAP 2-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear
Axle 6
-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Security Locks 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Belt Comfort Guides 1-31 . . . . . . . . . . . . . . . . . . . . .
Seat Outside Passengers 1-28 . . . . . . . . . . . . . . . . . . . . . . . .
Seats 1-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Window Defogger 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Window Washer/Wiper 2-36 . . . . . . . . . . . . . . . . . . . . . . . .
Rear Seat Audio 3-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rearview Mirror 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reclining Front Seatbacks 1-5 . . . . . . . . . . . . . . . . . . . . . . . . .
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