CADILLAC SEVILLE 1993 4.G Owners Manual

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How to Add Coolant to the Coolant Recovery Tank
If you haven’t found a problem yet, but the coolant level isn’t at or above
“FULL COLD,” add a 50/50 mixture of clean water (preferably distilled)
and
a proper antifreeze at the coolant recovery tank. (See “Engine
Coolant” in the Index for more information about the proper coolant
mix.)
A 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
mix will. Your vehicle’s coolant
warning system is set for the proper coolant
mix. With plain
I 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 a proper antifreeze.
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Downloaded from www.Manualslib.com manuals search engine 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. \
When the coolant in the coolant recovery tank is at or above “FULL
COLD,” start your vehicle.
If the overheat warning continues, there’s one more thing you can try.
You can add the proper coolant mix directly to the radiator, but be sure
the cooling system is cool before you do it.
238

Downloaded from www.Manualslib.com manuals search engine A 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.
239

Downloaded from www.Manualslib.com manuals search engine How to Add Coolant to the Radiator
a , ','> . /. ~ 1. You can remove
the radiator _.II
(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. pressure
cap when
the cooling
system, including
the radiator
pressure cap and
upper radiator
hose, is
no longer
hot.
Turn the
pressure cap
slowly
to the left
until it first stops.
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Downloaded from www.Manualslib.com manuals search engine . -..... . . , . 3. Fill the radiator
with the proper
mix, up to the
base
of the filler
neck.
.. Then fill the
coolant recovery
tank to “FULL
COLD.”
24 1

Downloaded from www.Manualslib.com manuals search engine 5. Put the cap back
on the coolant
recovery tank, but
leave the radiator
pressure cap
off.
you can feel the
upper radiator
hose getting hot.
Watch out for the
engine fans.
7. By this time the coolant level inside the radiator filler neck may be
lower.
If the level is lower, add more of the proper mix through the
filler neck until the level reaches the base
of the filler neck.
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8. Replace the
pressure cap. Be
sure the arrows on
the pressure cap
line up like this.
COOLING SYSTEM= 4.6 LITER
(NORTHSTAR)
i
When you decide it's safe to lift the hood, here's what you'll see:
Coolant surge tank with pressure cap
Electric engine fans
243

Downloaded from www.Manualslib.com manuals search engine I A CAUTION
An electric 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 surge tank is boiling, don’t do anything
else until it cools
down.
The coolant level
should be at or above
“FULL COLD.” If it
isn’t,
you may have a
leak in the radiator
hoses, heater hoses,
radiator, water pump
or somewhere else in
the cooling
system.
A 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.
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If there seems to be no leak, check to see if the electric engine fans are
running. If the engine
is overheating, both fans should be running. If they
aren’t, your vehicle needs service.
How to Add Coolant to the Coolant Surge Tank
If you haven’t found a problem yet, but the coolant level isn’t at or above
“FULL COLD,” add a 50/50 mixture of clean water (preferably distilled)
and a proper antifreeze at
the coolant recovery tank. (See “Engine
Coolant”
in the Index for more information about the proper coolant
mix.)
A CAUTION
Adding only plain water to your cooling system can De
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
a proper antifreeze.
245

Downloaded from www.Manualslib.com manuals search engine 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.
Should a low coolant condition exist, an overheat protection “Limp
Home” feature
of the 4.6 L Northstar allows alternate firing groups of
four cylinders for
a predetermined number of cycles to prevent engine
damage, enabling your vehicle
to be driven to the nearest service center.
A 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 coolant surge tank pressure cap
-- even a little -- they
can come out
at high speed. Never turn the cap when the cooling
system, including the coolant surge tank pressure cap,
is hot.
Wait for the cooling system and coolant surge tank pressure cap
to cool if you ever have to turn the pressure cap.
246
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