engine overheat CADILLAC STS V 2007 1.G User Guide

Checking Intercooler System Coolant
(4.4L V8 STS-V Engine Only)
SeeEngine Compartment Overview on page 373
for the location of the intercooler system
pressure cap.Notice:This vehicle has a specic coolant ll
procedure. Failure to follow this procedure
could cause your engine to overheat and
be severely damaged.
Park the vehicle on a level surface and turn off the
engine. When the engine is cold, the coolant
level should be visible in the intercooler ll neck.
Adding Coolant
If you need more coolant, add the proper
DEX-COOL®coolant mixture at the intercooler ll
neck, but only when the engine is cool. See
Cooling System on page 396for instructions on
how to add coolant to the intercooler ll neck.
392

{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. Do not spill
coolant on a hot engine.
When replacing a pressure cap, make sure it is
hand-tight and fully seated.
Coolant Surge Tank Pressure Cap
Notice:If the pressure cap is not tightly
installed, coolant loss and possible engine
damage may occur. Be sure the cap is properly
and tightly secured.
The coolant surge tank pressure cap must be fully
installed on the coolant surge tank. SeeEngine
Compartment Overview on page 373for more
information on location.
Engine Overheating
There are two engine hot messages that could be
displayed in the Driver Information Center (DIC).
SeeDIC Warnings and Messages on page 264for
more information.
If the engine is overheating, then you will nd a
coolant temperature gage and a coolant warning
light on the instrument panel. SeeEngine
Coolant Temperature Gage on page 251and
Engine Coolant Temperature Warning Light on
page 251for more information.
393

If Steam Is Coming From Your Engine
{CAUTION:
Steam from an overheated engine can
burn you badly, even if you just open the
hood. Stay away from the engine if you
see or hear steam coming from it. Turn it
off and get everyone away from the
vehicle until it cools down. Wait until
there is no sign of steam or coolant
before you open the hood.
If you keep driving when the vehicles
engine is overheated, the liquids in it can
catch re. You or others could be badly
burned. Stop your engine if it overheats,
and get out of the vehicle until the engine
is cool.
SeeOverheated Engine Protection
Operating Mode on page 395for
information on driving to a safe place in
an emergency.Notice:If your engine catches re because
you keep driving with no coolant, your vehicle
can be badly damaged. The costly repairs
would not be covered by your warranty. See
Overheated Engine Protection Operating Mode
on page 395for information on driving to a
safe place in an emergency.
If No Steam Is Coming From
Your Engine
An overheat warning, can indicate a serious
problem.
If you get an engine overheat warning but see or
hear no steam, the problem might not be too
serious. Sometimes the engine can get a little too
hot when you:
Climb a long hill on a hot day.
Stop after high-speed driving.
Idle for long periods in traffic.
Tow a trailer.
394

If you get the overheat warning with no sign of
steam, try this for a minute or so:
1. In heavy traffic, let the engine idle in
NEUTRAL (N) while stopped. If it is safe to do
so, pull off the road, shift to PARK (P) or
NEUTRAL (N) and let the engine idle.
2. Set the climate controls to the highest heat
setting and fan speed and open the windows,
as necessary.
If the coolant warning light is not on or the coolant
temperature gage does not indicate the engine
is overheating, you can drive. Just to be safe, drive
slower for about 10 minutes. If the warnings do
not come back on, drive normally.
If the warnings continue and you have not stopped,
pull over, stop, and park the vehicle right away.
If there is still no sign of steam, idle the engine for
three minutes while parked. If the warnings are
still indicated, turn off the engine and get everyone
out of the vehicle until it cools down. Also, see
“Overheated Engine Protection Operating Mode”
later in this section.
You might decide not to lift the hood but to get
service help right away.Overheated Engine Protection
Operating Mode
This operating mode allows your vehicle to be
driven to a safe place in an emergency. Should an
overheated engine condition exist, an overheat
protection mode which alternates ring groups of
cylinders helps prevent engine damage. In this
mode, you will notice a loss in power and engine
performance. An engine overheat warning will
indicate that an overheat condition exists. Driving
extended miles (km) and/or towing a trailer in
the overheat protection mode should be avoided.
Notice:After driving in the overheated
engine protection operating mode, to avoid
engine damage, allow the engine to cool before
attempting any repair. The engine oil will be
severely degraded. Repair the cause of coolant
loss and change the oil. SeeEngine Oil on
page 380.
395

{CAUTION:
Heater and radiator hoses, and other
engine parts, can be very hot. Do not
touch them. If you do, you can be burned.
Do not run the engine if there is a leak. If
you run the engine, it could lose all
coolant. That could cause an engine re,
and you could be burned. Get any leak
xed 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 are not, your vehicle
needs service.Notice:Engine damage from running your
engine without coolant is not covered by your
warranty. SeeOverheated Engine Protection
Operating Mode on page 395for information on
driving to a safe place in an emergency.
Notice:Using coolant other than DEX-COOL
®
may cause premature engine, heater core,
or radiator corrosion. In addition, the engine
coolant could require changing sooner, at
30,000 miles (50 000 km) or 24 months,
whichever occurs rst. Any repairs would not
be covered by your warranty. Always use
DEX-COOL
®(silicate-free) coolant in your
vehicle.
397

How to Add Coolant to the Coolant
Surge Tank
If you have not found a problem yet, check to see
if coolant is visible in the surge tank. If coolant
is visible but the coolant level is not at the FULL
COLD/FROID line on the side of the coolant
surge tank, add a 50/50 mixture of clean, drinkable
water and DEX-COOL
®coolant at the coolant
surge tank, but be sure the cooling system,
including the coolant surge tank pressure cap, is
cool before you do it. SeeEngine Coolant on
page 389for more information.
{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
CAUTION: (Continued)
CAUTION: (Continued)
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.
{CAUTION:
Adding only plain water to your cooling
system can be dangerous. Plain water, or
some other liquid such as alcohol, can
boil before the proper coolant mixture will.
Your vehicle’s coolant warning system is
set for the proper coolant mixture. With
plain water or the wrong mixture, your
engine could get too hot but you would
not get the overheat warning. Your engine
could catch re and you or others could
be burned. Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
®coolant.
398

{CAUTION:
Turning the Intercooler System pressure
cap when the engine and intercooler are
hot can allow steam and scalding liquids
to blow out and burn you badly. Never
turn the Intercooler System pressure cap,
even a little, when the engine and
intercooler are hot.
{CAUTION:
Adding only plain water to your cooling
system can be dangerous. Plain water, or
some other liquid such as alcohol, can
boil before the proper coolant mixture will.
Your vehicle’s coolant warning system is
set for the proper coolant mixture. With
plain water or the wrong mixture, your
CAUTION: (Continued)
CAUTION: (Continued)
engine could get too hot but you would
not get the overheat warning. Your engine
could catch re and you or others could
be burned. Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
®coolant.
Notice:In cold weather, water can freeze and
crack the engine, radiator, heater core and
other parts. Use the recommended coolant and
the proper coolant mixture.
{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. Do not spill
coolant on a hot engine.
401

Driver Information Center (DIC)................... 258
DIC Controls and Displays....................... 258
DIC Warnings and Messages................... 264
Other Messages....................................... 279
Driving
At Night................................................... 333
City.......................................................... 338
Defensive................................................. 316
Drunken................................................... 317
Freeway................................................... 339
Hill and Mountain Roads.......................... 342
In Rain and on Wet Roads...................... 335
Rocking Your Vehicle to Get it Out.......... 349
Winter...................................................... 344
Dual Climate Control System....................... 230
E
Electric Power Management........................ 221
Electrical System
Add-On Equipment................................... 486
Fuses and Circuit Breakers...................... 487
Headlamp Wiring..................................... 486
Power Windows and Other Power
Options................................................. 487Electrical System (cont.)
Rear Underseat Fuse Block..................... 492
Underhood Fuse Block............................. 488
Windshield Wiper Fuses........................... 486
Engine
Air Cleaner/Filter...................................... 386
Battery..................................................... 408
Check and Service Engine Soon Light..... 252
Coolant.................................................... 389
Coolant Heater......................................... 115
Coolant Temperature Gage...................... 251
Coolant Temperature Warning Light.......... 251
Drive Belt Routing.................................... 519
Engine Compartment Overview ................ 373
Exhaust................................................... 125
Oil ........................................................... 380
Oil Life System........................................ 383
Overheated Protection Operating Mode.... 395
Overheating............................................. 393
Starting.................................................... 113
Supercharger Oil...................................... 385
Entry Lighting.............................................. 220
Event Data Recorders (EDR)...................... 536
Extender, Safety Belt..................................... 37
Exterior Lighting Battery Saver.................... 219
549

O
Odometer.................................................... 243
Off-Road Recovery...................................... 330
Oil
Engine..................................................... 380
Pressure Light.......................................... 255
Supercharger, Engine............................... 385
Oil, Engine Oil Life System......................... 383
Older Children, Restraints............................. 38
Online Owner Center................................... 528
OnStar
®System, see OnStar®Manual........ 132
Operation, Universal Home Remote
System............................................137, 142
Other Warning Devices................................ 180
Outlet Adjustment........................................ 237
Outlet(s), Accessory Power.......................... 228
Outside
Automatic Dimming Mirror........................ 131
Convex Mirror.......................................... 131
Parallel Park Assist Mirror........................ 131
Power Heated Mirrors.............................. 130
Overheated Engine Protection
Operating Mode....................................... 395
Owner Checks and Services....................... 512
Owners, Canadian.......................................... 3
P
Paint, Damage............................................ 483
Panic Brake Assist...................................... 327
Parade Dimming.......................................... 220
Park Aid...................................................... 226
Park (P)
Shifting Into............................................. 122
Shifting Out of......................................... 124
Parking
Assist....................................................... 226
Brake....................................................... 121
Over Things That Burn............................ 124
Passenger Airbag Status Indicator............... 245
Passenger Compartment Air Filter............... 239
Passenger Sensing System........................... 74
Passing....................................................... 330
Power
Accessory Outlet(s).................................. 228
Door Locks................................................ 99
Electrical System..................................... 487
Inadvertent Battery Saver ......................... 222
Lumbar Controls.......................................... 9
Reclining Seatbacks................................... 11
Retained Accessory (RAP)....................... 112
Seat............................................................ 9
554