Page 227 of 404
Downloaded from www.Manualslib.com manuals search engine 4. Fill the radiator with the proper DEX-COOL'
coolant mixture, up to the base of the filler neck.
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.
5. Then fill the coolant recovery tank to FULL HOT.
6. Put the cap back on the coolant recovery tank, but
leave the radiator pressure cap off.
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Page 228 of 404
Downloaded from www.Manualslib.com manuals search engine 3
7. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Wdtch out for the
engine fan(
s).
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.
8. By this time, the coolant level inside the radiator
9. Then replace the pressure cap. At any time during
this procedure if coolant begins to
flow out of the
filler neck, reinstall the pressure cap. Be sure the
arrows
on the pressure cap line up like this.
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Page 229 of 404
Downloaded from www.Manualslib.com manuals search engine How to Add Coolant to the Radiator
(VS Engine Only)
I NOTICE:
The LT1 Engine (Code P) 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.
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Page 231 of 404
Downloaded from www.Manualslib.com manuals search engine 8. Start the engine and allow it to run in idle for
approximately four minutes. By this time, the
coolant level inside the radiator will be lower. Add
more
of the proper mix through the filler neck until
the level reaches the base of the filler neck.
4. Fill with the proper DEX-COOL@ coolant mixture.
Add coolant until
you see a steady stream of coolant
coming from
the bleed valves.
5. Close the bleed valves.
I
E
6. Continue to fill the radiator up to the base of the
filler neck.
7. Rinse or wipe the spilled coolant from the engine
and compartment.
9. Shut the engine off and replace the pressure cap. Be
sure the arrows on the cap line up like this.
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Page 274 of 404

Downloaded from www.Manualslib.com manuals search engine Engine Coolant
The cooling s stem 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 “Engine Overheating” in the Index.
d
A 50/50 mixture of water and DEX-COOL@
coolant will:
0 Give freezing protection down to -34°F (-37°C).
0 Give boiling protection up to 265 “F (1 29°C).
0 Protect against rust and corrosion.
0 Help keep the proper engine temperature.
0 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 silicated coolant 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.
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Page 275 of 404

Downloaded from www.Manualslib.com manuals search engine What to Use
Use a mixture of one-half clean water (preferably
distilled) and one-half
DEX-COOL@ coolant which
won’t damage aluminum parts. Use
GM Engine Coolant
Supplement (sealer)
(GM Part No. 3634621) with any
complete coolant change.
If you use this mixture, you
don’t need to add anything else.
CAUTION:
Adding only plain water to your cooling syste.m
can be dangerous. Plain water, or some other
liquid like alcohol, can boil before the proper
coolant mix will. Your vehicle’s coolant warning
system is set for the proper coolant mix. With
plain water or the wrong mix, 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 mix of clean
water and
DEX-COOL@ coolant.
NOTICE:
If you use an improper coolant mix, your engine
could overheat and be badly damaged. The
repair cost wouldn’t be covered by your
warranty. Too much water in the mix can freeze
and crack the engine, radiator, heater core and
other parts.
[f you have to add coolant more than four times a year,
lave your dealer :ck 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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Page 276 of 404
Downloaded from www.Manualslib.com manuals search engine Checking Coolant
5.7L Engine Only
When your engine is cold, check the dipstick on the cap
of the coolant recovery tank. The coolant level should
be at
COLD, or a little higher. When your engine is
warm, the level on the dipstick should be up to HOT,
or a little higher.
If this light comes on, it
means you’re low on
engine coolant.
Adding Coolant to the Recovery Tank
If you need more coolant, add the proper DEX-COOL’
coolant mixture at the coolant recovery tank, but only
when your engine is cool.
If the tank is very low or
empty, also add coolant to the radiator. See “Engine
Overheating” in the Index for information.
Page 277 of 404

Downloaded from www.Manualslib.com manuals search engine A 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. Never turn the 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.
'
A 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.
Radiator Pressure Cap (All Engines)
NOTICE:
Your radiator cap is an 18 psi (124 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 AC@
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 AC@ thermostat
is recommended.
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