2002 PONTIAC BONNEVILLE radiator cap

5-12
Cooling System
When you decide it's safe to lift the hood, here's what
you'll see:
A. Coolant Recovery Tank
B. Radiator Pressure Cap
C. Electric Engine Cooling Fans
CAUTION:
An electric engine cooling fan under the hood can
start up even when the engine is not running and
can injure you. Keep hands, clothing and tools
away from any underhood electric fan.
If the coolant inside the coolant recovery tank is boiling,
don't do anything else until it cools down. The vehicle
should be parked on a level surface.
See ªEngine Compartment
Overviewº in the Index
for more information
on location.

5-13
The coolant level should be at or above the FULL
COLD mark (if the engine is hot, the coolant level
should be at FULL HOT). If it isn't, 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. Don't touch them. If you
do, you can be burned.
Don't run the engine if there is a leak. If you run
the engine, it could lose all coolant. That could
cause an engine fire, and you could be burned.
Get any leak fixed before you drive the vehicle.
If there seems to be no leak, with the engine on,
check to see if the electric engine cooling fans are
running. If the engine is overheating, both fans should
be running. If they aren't, your vehicle needs service.
NOTICE:
Engine damage from running your engine
without coolant isn't covered by your warranty.
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.

5-15
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.
When the coolant in the coolant recovery tank is at the
FULL COLD mark, start your vehicle.
If the overheat warning continues, there's one more
thing you can try. You can add the proper coolant
mixture directly to the radiator, but be sure the cooling
system is cool before you do it.
CAUTION:
Steam and scalding liquids from a hot cooling
system can blow out and burn you badly. They
are under pressure, and if you turn the radiator
pressure cap
-- even a little -- they can come out
at high speed.
CAUTION: (Continued)
CAUTION: (Continued)
Never turn the cap when the cooling system,
including the radiator pressure cap, is hot. Wait
for the cooling system and radiator pressure cap
to cool if you ever have to turn the pressure cap.

5-16 How to Add Coolant to the Radiator
1. You can remove the radiator pressure cap when
the cooling system, including the radiator pressure
cap and upper radiator hose, is no longer hot. Turn
the pressure cap slowly counterclockwise until it
first stops. (Don't press down while turning the
pressure cap.)
If you hear a hiss, wait for that to stop. A hiss means
there is still some pressure left.
2. Then keep turning the pressure cap, but now push
down as you turn it. Remove the pressure cap.
3. Remove the 3800 Series II V6 engine cover shield to
access the bleed valve.

5-18
5. Fill the radiator with the proper DEX-COOL

coolant mixture, up to the base of the filler neck. See
ªEngine Coolantº in the Index for more information
about the proper coolant mixture.
If you see a stream of coolant coming from an air
bleed valve, close the valve. Otherwise, close the
valve after the radiator is filled.
6. Rinse or wipe any spilled coolant from the engine
and the compartment.7. Replace the 3800 Series II V6 engine cover shield.
A. Remove the oil fill tube, with cap attached, from
the valve cover.
B. Insert the catch tab on the cover shield under the
bracket on the engine.
C. Place the hole in the cover shield over the hole in
the valve cover. Install oil fill tube and cap by
twisting clockwise.
D. If you have the supercharged engine, install the
nut in the center of the cover shield.

5-19
8. Then fill the coolant recovery tank to the FULL
COLD mark.
9. Put the cap back on the coolant recovery tank, but
leave the radiator pressure cap off.10. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fans.
11. By this time, the coolant level inside the radiator
filler neck may be lower. If the level is lower, add
more of the proper DEX
-COOL
coolant mixture
through the filler neck until the level reaches the
base of the filler neck.

6-
6-1
Section 6 Service and Appearance Care
Here you will find information about the care of your vehicle. This section begins with service and fuel information,
and then it shows how to check important fluid and lubricant levels. There is also technical information about your
vehicle, and a part devoted to its appearance care.
6
-2 Service
6
-3 Fuel
6
-5 Fuels in Foreign Countries
6
-6 Filling Your Tank
6
-9 Filling a Portable Fuel Container
6
-9 Checking Things Under the Hood
6
-12 Engine Oil
6
-17 Engine Air Cleaner/Filter
6
-19 Passenger Compartment Air Filter
(If Equipped)
6
-20 Supercharger Oil
6
-21 Automatic Transaxle Fluid
6
-25 Engine Coolant
6
-28 Radiator Pressure Cap
6
-28 Power Steering Fluid
6
-29 Windshield Washer Fluid
6
-31 Brakes6
-34 Battery
6
-36 Bulb Replacement
6
-45 Windshield Wiper Blade Replacement
6
-46 Tires
6
-57 Appearance Care
6
-58 Cleaning the Inside of Your Vehicle
6
-60 Care of Safety Belts
6
-61 Cleaning the Outside of Your Vehicle
6
-63 Sheet Metal Damage
6
-65 GM Vehicle Care/Appearance Materials
6
-66 Vehicle Identification Number (VIN)
6
-67 Electrical System
6
-71 Removing the Rear Seat Cushion
6
-77 Replacement Bulbs
6
-77 Capacities and Specifications
6
-78 Normal Maintenance Replacement Parts

6-11 Engine Compartment Overview
When you open the hood on the 3800 (L36) engine (3800 Supercharged (L67) engine similar), here's what you will see:
A. Engine Compartment Fuse Block
B. Windshield Washer
Fluid Reservoir
C. Engine Coolant Recovery TankD. Radiator Pressure Cap
E. Power Steering Fluid Reservoir
F. Engine Oil Dipstick
G. Engine Oil Fill CapH. Automatic Transaxle
Fluid Dipstick
I. Brake Master Cylinder
J. Engine Air Cleaner/Filter