2007 CADILLAC STS V cooling

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

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.
If no coolant is visible in the surge tank, add
coolant as follows:
1. Remove the coolant surge tank pressure cap
when the cooling system, including the
coolant surge tank pressure cap and upper
radiator hose, is no longer hot. Turn the
pressure cap slowly counterclockwise about
one-quarter of a turn. 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 slowly,
and remove it.
399

3. Fill the coolant surge tank with the proper
DEX-COOL®coolant mixture, to slightly
above the FULL COLD/FROID line on the
side of the coolant surge tank.
4. With the coolant surge tank pressure cap off,
start the engine and let it run until you can
feel the upper radiator hose getting hot. The
upper radiator hose is the largest of the
hoses which comes out of the radiator, on the
passenger side of the vehicle. Watch out
for the engine cooling fans.By this time, the coolant level inside the
coolant surge tank may be lower. If the level
is lower, add more of the proper mixture
to the coolant surge tank until the level
reaches the FULL COLD/FROID line on the
side of the coolant surge tank.
5. Then replace the pressure cap. Be sure the
pressure cap is hand-tight and fully seated.
Start the engine and allow it to warm up.
How to Add Coolant to the Intercooler
System Fill Neck (4.4L V8 STS-V
Engine Only)
If you have not found a problem yet, turn the
engine off and allow it to cool down, then check to
see if coolant is visible within the horizontal
tube section of the ll neck. If coolant is not visible,
add a 50/50 mixture of clean, drinkable water
and DEX-COOL
®coolant to the ll neck. Be sure
the Intercooler System, including the Intercooler
System pressure cap, is cool before doing so. See
Engine Coolant on page 389for more information.
400

{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

Each new wheel should have the same
load-carrying capacity, diameter, width, offset and
be mounted the same way as the one it
replaces.
If you need to replace any of your wheels, wheel
bolts, or wheel nuts, replace them only with
new GM original equipment parts. This way, you
will be sure to have the right wheel, wheel
bolts, and wheel nuts for your vehicle.
{CAUTION:
Using the wrong replacement wheels,
wheel bolts, or wheel nuts on your vehicle
can be dangerous. It could affect the
braking and handling of your vehicle,
make your tires lose air and make you
lose control. You could have a collision in
which you or others could be injured.
Always use the correct wheel, wheel bolts,
and wheel nuts for replacement.Notice:The wrong wheel can also cause
problems with bearing life, brake cooling,
speedometer or odometer calibration,
headlamp aim, bumper height, vehicle ground
clearance, and tire or tire chain clearance
to the body and chassis.
SeeChanging a Flat Tire on page 464for more
information.
Used Replacement Wheels
{CAUTION:
Putting a used wheel on your vehicle is
dangerous. You cannot know how it has
been used or how far it has been driven. It
could fail suddenly and cause a crash. If
you have to replace a wheel, use a new
GM original equipment wheel.
446

Fuses Usage
LIC/DIMMINGLicense Plate, Instrument
Panel Dimming
IPM/ALDLInstrument Panel Module Assembly
Line Data Link Connector
HUDHeads-Up Display, Column Lock
Module, Steering Column Switch
V8 ECMV8 Engine Control Module (ECM),
Evap. Solenoid, Vacuum Bypass
ABS Anti-lock Brake Controller
STR RLY Starter Relay
WASH
NOZ/AQSHeated Washer Nozzles, Air
Quality Sensor
ODD COILSOdd Ignition Coils, Odd
Fuel Injectors
TCM IPCTransmission Control Module (TCM),
Instrument Panel, Engine Control
SPARE Spare
MAF Mass Air Flow Sensor (V6)
HIGH FAN Cooling Fan - High Speed
LOW FAN Cooling Fan - Low Speed
RT PARKPassenger’s Side Park Lamp,
Right TaillampFuses Usage
HORN Horn
LT HI BEAM Driver’s Side Headlamp High-Beam
LT LOW BEAM Driver’s Side Headlamp Low-Beam
RT LOW BEAMPassenger’s Side Headlamp
Low-Beam
RT HI BEAM Right Headlamp High-Beam
HFV6 ECMHigh Feature V6 Engine Control
Module (ECM), Mass Air Flow
Sensor (MAF) (V8)
Relays Usage
HDLP WASH
RELAY
JUMPER -OPTHeadlamp Washer
STARTER
RELAY MINIStarter
SPARE Spare
FOG LAMP
RELAY MICROFog Lamps
CMP CLU
RELAY MICROAir Conditioning Compressor
Clutch
490

Relays Usage
BLOWER
RELAY MINIFront Blower Motor
POWERTRAIN
RELAY MICROEngine Controls
RUN/CRANK
RELAY MICROIgnition 1, Starter, Washer Nozzle,
Air Quality, Anti-lock Brake System,
Climate Control Panel, Transmission
Control Module, Instrument Panel
Cluster, Mass Airow Sensor,
Engine Control Module
LOW SPEED
FAN RELAY
MINICooling Fan Low Speed
ACCESSORY
RELAY MINIIgnition 3, Rain Sensor, Headlamp
Washer, Windshield Wiper/Washer
Module
PARK LAMP
RELAY MICROParking Lamps, Instrument Panel
Dimming, Rear License Plate Lamps
HIGH BEAM
RELAY MICROHeadlamp High-Beam
LOW BEAM
RELAY/HID
MINI-OPTLow-Beam/High Intensity DischargeRelays Usage
HIGH SPEED
FAN RELAY
MINICooling Fan High Speed
S/P FAN
RELAY MINICooling Fan Series/Parallel
HORN RELAY
MICROHorn
SPARE Spare
Circuit
BreakersUsage
HDLP WASH
C/B -OPTHeadlamp Washer (If Equipped)
Harness
ConnectionUsage
ENG W/H Engine Harness Connection
BODY W/H Body Harness Connection
BODY W/H Body Harness Connection
491

Fuses Usage
AFTERBOIL/
DIFF PUMP
(OPT)After Boil, Rear Differential
Cooling Pump
RIM Ignition to Rear Integration Module
Relays Usage
SPARE Spare
REAR DEFOG
RELAY MINIRear Defog
FUEL PUMP
RELAY MICROFuel Pump
REAR FOG
LAMP RLY
MICRO (OPT)Rear Fog Lamps (Option)
STOP LAMP
RELAY MICROStoplamps
INT LAMP
RELAY MICROInterior Lamps
RUN/CRANK
RELAY MICROIgnition 1
AFTERBOIL/
DIFF PUMP
RELAY
MICRO (OPT)After Boil, Rear Differential
Cooling Pump (Option)
Circuit
BreakersUsage
WINDOW
MTRS C/BPower Window Motors
Circuit Breaker
Diodes Usage
TRUNK DIODE Trunk Release
Joint
ConnectorUsage
JOINT
CONNECTORSplice Pack (Blue)
497