1999 CHEVROLET LUMINA 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 (Code M) V6 Engine
A. Coolant Recovery Reservoir
B. Radiator Pressure Cap
C. Electric Engine Cooling Fans
3800 (Code K) V6 Engine
A. Coolant Recovery Reservoir
B. Electric Engine Cooling Fans
C. Radiator Pressure Cap

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5-17
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.

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5-18 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.
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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5-21
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.
8. Then fill the coolant recovery tank to the
COLD mark.9. Put the cap back on the coolant recovery tank, but
leave the 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 on the 3100 (Code M) V6 engine, you'll see:
A. Engine Coolant Reservoir
B. Radiator Fill Cap
C. Power Steering Fluid Reservoir
D. Engine Oil Fill Cap
E. Engine Oil DipstickF. Automatic Transaxle
Fluid Dipstick
G. Brake Fluid Reservoir
H. Engine Air Cleaner/Filter
I. Remote Positive (+)
Battery TerminalJ. Windshield Washer
Fluid Reservoir
K. Battery (located under
Windshield Washer
Fluid Reservoir)

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6-11
When you open the hood on the 3800 (Code K) V6 engine, you'll see:
A. Engine Coolant Reservoir
B. Radiator Fill Cap
C. Power Steering Fluid Reservoir
D. Engine Oil Dipstick
E. Engine Oil Fill CapF. Automatic Transaxle
Fluid Dipstick
G. Brake Fluid Reservoir
H. Engine Air Cleaner/Filter
I. Remote Positive (+)
Battery TerminalJ. Windshield Washer
Fluid Reservoir
K. Battery (located under
Windshield Washer
Fluid Reservoir)

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6-22 How to Add Fluid
Refer to the Maintenance Schedule to determine what
kind of transaxle fluid to use. See ªRecommended
Fluids and Lubricantsº in the Index.
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.

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6-26
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.
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
3100 (Code M)
V6 Engine 3800 (Code K)
V6 Engine
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.