1999 CHEVROLET LUMINA cooling

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6-23
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.
When you replace your thermostat, an ACDelco


thermostat is recommended.
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 or if you need to add coolant to your
radiator, 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.
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.

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6-24 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.
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.

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6-45 Wheel Alignment and Tire Balance
The wheels on your vehicle were aligned and balanced
carefully at the factory to give you the longest tire life
and best overall performance.
Scheduled wheel alignment and wheel balancing are not
needed. However, if you notice unusual tire wear or
your vehicle pulling one way or the other, the alignment
may need to be reset. If you notice your vehicle
vibrating when driving on a smooth road, your wheels
may need to be rebalanced.
Wheel Replacement
Replace any wheel that is bent, cracked, or badly rusted
or corroded. If wheel nuts keep coming loose, the wheel,
wheel bolts and wheel nuts should be replaced. If the
wheel leaks air, replace it (except some aluminum
wheels, which can sometimes be repaired). See your
dealer if any of these conditions exist.
Your dealer will know the kind of wheel you need.
Each new wheel should have the same load
-carrying
capacity, diameter, width, offset and be mounted the
same way as the one it replaces.
If you need to replace any of your wheels, wheel bolts
or wheel nuts, replace them only with new GM original
equipment parts. This way, you will be sure to have the
right wheel, wheel bolts and wheel nuts for your vehicle.
CAUTION:
Using the wrong replacement wheels, wheel bolts
or wheel nuts on your vehicle can be dangerous.
It could affect the braking and handling of your
vehicle, make your tires lose air and make you
lose control. You could have a collision in
which you or others could be injured. Always
use the correct wheel, wheel bolts and wheel nuts
for replacement.
NOTICE:
The wrong wheel can also cause problems with
bearing life, brake cooling, speedometer or
odometer calibration, headlamp aim, bumper
height, vehicle ground clearance and tire or tire
chain clearance to the body and chassis.
See ªChanging a Flat Tireº in the Index for
more information.

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6-61
Fuse Description
F/INJN Fuel Injectors
PCM IGN Mass Air Flow (MAF) Sensor
Heated Oxygen Sensor #1 and #2
Evaporative Emissions (EVAP)
Canister Purge Solenoid Valve
ELEK IGN Electronic Ignition (EI)
Control Module
10 I/P Fuse Block
12 Passenger's Side Underhood
Electrical Center, IGN SYST Relay,
R/CMPT REL fuse, PCM BAT fuse
13 FAN CONT #1 Relay
Relay Description
14 FUEL PUMP
15 A/C CMPR
16 FAN CONT #2
-- Secondary
Cooling Fan (Passenger's Side)
17 FAN CONT #1
-- Primary Cooling
Fan (Driver's Side)
18 IGN SYSTUnderhood Electrical Center
-- Driver's Side

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6-62
Fuse Description
FAN #3 FAN #3 Relay
PARK LPS Headlamp Switch
HORN Horn Relay
ABS Anti
-Lock Brake System
11 Circuit Breaker C, Starter Relay,
STR WHL Control # 2,
Power Accessory #2, and
Theft
-Deterrent RelayFuse Description
12 HD LPS
-- Circuit Breaker to
Headlamp Switch
13 ABS
-- ABS Relay
Relay Description
14 ABS
-- Anti-Lock Brake System
15 FAN #3
-- Secondary Cooling Fan
(Passenger's Side)
16 HORN
Replacement Bulbs
Exterior Lamps Bulb Number
Back
-Up 3156 or 3057. . . . . . . . . . . . . . . . . . . . . . . . .
Center High
-Mounted Stoplamp 891T2. . . . . . . . . . .
Front Parking/Turn Signal 3357NA. . . . . . . . . . . . . . .
Headlamp, High
-Beam 9005. . . . . . . . . . . . . . . . . . .
Headlamp, Low
-Beam 9006. . . . . . . . . . . . . . . . . . . .
Stop/Tail/Turn Signal 3057. . . . . . . . . . . . . . . . . . . . .
Interior Lamps Bulb Number
Dome 10230955. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
*For service information on these bulbs, contact your
Chevrolet dealer service department.

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6-63
Capacities and Specifications
Please refer to ªRecommended Fluids and Lubricantsº
in the Index for more information.
4T60E:
Automatic Transaxle
Pan Removal and Replacement 7.0 quarts (6.7 L). . .
After Complete Overhaul 9.6 quarts (9.2 L). . . . . . . .
4T65E:
Automatic Transaxle
Pan Removal and Replacement 7.4 quarts (7.0 L). . .
After Complete Overhaul 10.0 quarts (9.5 L). . . . . . .
When draining/replacing converter, more fluid will
be needed.
Cooling System Including Reservoir
3100 (Code M) V6 11.6 quarts (10.9 L). . . . . . . . . . . .
3800 (Code K) V6 11.7 quarts (11.0 L). . . . . . . . . . . . Refrigerant (R
-134a),
Air Conditioning*1.88 lbs. (0.85 kg) . . . . . . . . . . . .
Engine Crankcase
- Oil and
Filter Change
3100 (Code M) V6 4.5 quarts (4.3 L). . . . . . . . . . . . .
3800 (Code K) V6 4.5 quarts (4.3 L). . . . . . . . . . . . .
Fuel Tank
3100 (Code M) V6 16.6 gallons (62.8 L). . . . . . . . . . .
3800 (Code K) V6 16.6 gallons (62.8 L). . . . . . . . . . .
*See ªAir Conditioning Refrigerantsº later in
this section.
Note: All capacities are approximate. When adding, be
sure to fill to the approximate level, as recommended in
this manual. See ªRecommended Fluids and Lubricantsº
in the Index.

Scheduled Maintenance
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7-12
100,000 Miles (166 000 km)
Inspect spark plug wires.
An Emission Control Service.
Replace spark plugs.
An Emission Control Service.
Change automatic transaxle 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.
If you haven't used your vehicle under severe service conditions listed
previously and, therefore, haven't changed your automatic transaxle fluid,
change both the fluid and filter.
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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7-18 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.
Throttle System Inspection
Inspect the throttle system for interference or binding,
and for damaged or missing parts. Replace parts as
needed. Replace any components that have high effort
or excessive wear. Do not lubricate accelerator and
cruise control cables.
Brake System Inspection
Inspect the complete system. Inspect brake lines and
hoses for proper hook
-up, binding, leaks, cracks,
chafing, etc. Inspect disc brake pads for wear and rotors
for surface condition. Also inspect drum brake linings
for wear and cracks. Inspect other brake parts, including
drums, wheel cylinders, calipers, parking brake, etc.
Check parking brake adjustment. You may need to have
your brakes inspected more often if your driving habits
or conditions result in frequent braking.