1999 PONTIAC GRAND PRIX radiator cap

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5-12
Cooling System
When you decide it's safe to lift the hood, here's what
you'll see:
3100 Engine
A. Coolant Recovery Tank
B. Electric Engine Cooling Fans
C. Radiator Pressure Cap
3800 and 3800 Supercharged Engine
A. Coolant Recovery Tank
B. Electric Engine Cooling Fans
C. Radiator Pressure Cap

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5-16
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. 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.
How to Add Coolant to the Radiator
NOTICE:
Your engine has a specific radiator fill procedure.
Failure to follow this procedure could cause your
engine to overheat and be severely damaged.

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5-17
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.
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.

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5-20
7. If you have the 3800 V6 engine, 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.8. Then fill the coolant recovery tank to the FULL 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.

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6-10
When you open the hood of the 3100 engine, you'll see:
A. Windshield Washer Fluid
B. Battery
C. Radiator Fill Cap
D. Engine Coolant ReservoirE. Power Steering Fluid Reservoir
F. Engine Oil Fill Cap
G. Engine Oil DipstickH. Automatic Transaxle Dipstick
I. Brake Fluid Reservoir
J. Engine Air Cleaner/Filter

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6-11
When you open the hood of the 3800 engine, you'll see:
A. Windshield Washer Fluid
B. Battery
C. Radiator Fill Cap
D. Engine Coolant ReservoirE. Power Steering Fluid Reservoir
(low in engine compartment)
F. Engine Oil Fill Cap
G. Engine Oil DipstickH. Automatic Transaxle Dipstick
I. Brake Fluid Reservoir
J. Engine Air Cleaner/Filter

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6-12
When you open the hood of the 3800 Supercharged engine, you'll see:
A. Windshield Washer Fluid
B. Battery
C. Radiator Fill Cap
D. Engine Coolant ReservoirE. Power Steering Fluid Reservoir
(low in engine compartment)
F. Engine Oil Fill Cap
G. Engine Oil DipstickH. Automatic Transaxle Dipstick
I. Brake Fluid Reservoir
J. Engine Air Cleaner/Filter

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6-25
If the fluid level is low, add only enough of the proper
fluid to bring the level into the cross
-hatched area on
the dipstick.
1. Pull out the dipstick.
2. Using a long
-neck funnel, add enough fluid at the
dipstick hole to bring it to the proper level.
It doesn't take much fluid, generally less than one
pint (0.5 L). Don't overfill.
NOTICE:
We recommend you use only fluid labeled
DEXRON
-III, because fluid with that label is
made especially for your automatic transaxle.
Damage caused by fluid other than
DEXRON

-III is not covered by your new
vehicle warranty.
3. After adding fluid, recheck the fluid level as
described under ªHow to Check.º
4. When the correct fluid level is obtained, push the
dipstick back in all the way.
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.
When you replace your radiator pressure cap, an
ACDelco
cap is recommended.
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.