2017 CADILLAC CTS engine overheat

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-MidEast-10293089) -
2017 - crc - 6/22/16
264 VEHICLE CARE
6.2L V8 Engine (:LT4)
1. Engine Coolant Surge Tankand Pressure Cap
2. Engine Cooling Fan (Out of View)
{Warning
An electric engine cooling fan
under the hood can start up even
when the engine is not running and
can cause injury. Keep hands,
clothing, and tools away from any
underhood electric fan.
{Warning
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 fire, and you could be
burned. Get any leak fixed before
you drive the vehicle.
Caution
Using coolant other than
DEX-COOL®can cause premature
engine, heater core, or radiator
corrosion. In addition, the engine
coolant could require changing
sooner. Any repairs would not be
covered by the vehicle warranty.
Always use DEX-COOL (silicate-free)
coolant in the vehicle.
Engine Coolant
The cooling system in the vehicle is
filled with DEX-COOL engine coolant.
See Maintenance Schedule 0324 and
Recommended Fluids and
Lubricants 0331.
The following explains the cooling
system and how to check and add
coolant when it is low. If there is a
problem with engine overheating, see
Engine Overheating 0267.
What to Use
{Warning
Adding only plain water or some
other liquid to the cooling system
can be dangerous. Plain water and
other liquids, can boil before the
proper coolant mixture will. The
coolant warning system is set for
the proper coolant mixture. With
plain water or the wrong mixture,
the engine could get too hot but
you would not get the overheat
warning. The engine could catch
(Continued)

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-MidEast-10293089) -
2017 - crc - 6/22/16
VEHICLE CARE 265
Warning (Continued)
fire and you or others could be
burned. Use a 50/50 mixture of
clean, drinkable water and
DEX-COOL coolant.
Use a 50/50 mixture of clean
drinkable water and DEX-COOL
coolant. This mixture:
. Gives freezing protection down to
−37 °C (−34 °F), outside
temperature.
. Gives boiling protection up to
129 °C (265 °F), engine
temperature.
. Protects against rust and
corrosion.
. Will not damage aluminum parts.
. Helps keep the proper engine
temperature.
Caution
If improper coolant mixture,
inhibitors, or additives are used in
the vehicle cooling system, the
engine could overheat and be
damaged. Too much water in the
mixture can freeze and crack engine
cooling parts. The repairs would not
be covered by the vehicle warranty.
Use only the proper mixture of
engine coolant for the cooling
system. See Recommended Fluids
and Lubricants 0331.
Never dispose of engine coolant by
putting it in the trash, pouring it on
the ground, or into sewers, streams,
or bodies of water. Have the coolant
changed by an authorized service
center, familiar with legal
requirements regarding used coolant
disposal. This will help protect the
environment and your health.
Checking Coolant
The vehicle must be on a level surface
when checking the coolant level. It is normal to see coolant moving in
the upper coolant hose return line
when the engine is running. It is also
normal to see bubbles entering the
surge tank through the small hose.
Check to see if coolant is visible in the
coolant surge tank. If the coolant
inside the coolant surge tank is
boiling, do not do anything else until
it cools down.
If coolant is visible but the coolant
level is not at or above the COLD FILL
line, add a 50/50 mixture of clean
drinkable water and DEX-COOL
coolant.
Be sure the cooling system is cool
before this is done.
It is normal for the coolant level in
the bottom chamber to rise and fall
with operating temperature and
ambient conditions. Coolant will
evaporate from the bottom chamber
in normal operation. This will happen
faster when the vehicle is driven for
long periods in hot, dry conditions.

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-MidEast-10293089) -
2017 - crc - 6/22/16
266 VEHICLE CARE
If no coolant is visible in the coolant
surge tank, add coolant as follows:
How to Add Coolant to the
Coolant Surge TankCaution
This vehicle has a specific coolant
fill procedure. Failure to follow this
procedure could cause the engine to
overheat and be severely damaged.
If no problem is found, check to see if
coolant is visible in the coolant surge
tank. If coolant is visible but the
coolant level is not at the bottom of
the fill neck, 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.
{Warning
Steam and scalding liquids from a
hot cooling system can blow out
and burn you badly. Never turn the
cap when the cooling system,
including the surge tank pressure
cap, is hot. Wait for the cooling
system and surge tank pressure cap
to cool.
{Warning
Adding only plain water or some
other liquid to the cooling system
can be dangerous. Plain water and
other liquids, can boil before the
proper coolant mixture will. The
coolant warning system is set for
the proper coolant mixture. With
plain water or the wrong mixture,
the engine could get too hot but
you would not get the overheat
warning. The engine could catch
fire and you or others could be (Continued)
Warning (Continued)
burned. Use a 50/50 mixture of
clean, drinkable water and
DEX-COOL coolant.
Caution
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.
{Warning
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.
1. Remove the coolant surge tank pressure cap from the top
chamber when the cooling

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-MidEast-10293089) -
2017 - crc - 6/22/16
VEHICLE CARE 267
system, including the coolant
surge tank pressure cap and
upper radiator hose, is no
longer hot.
Turn the pressure cap slowly
counterclockwise. If you hear a
hiss, wait for that to stop. This
will allow any pressure still left
to be vented out the
discharge hose.
2. Keep turning the pressure cap slowly and remove it. Open the
surge tank service port cap to
the lower chamber. The service
port is behind the top chamber.3. Fill the surge tank top chamberwith the proper DEX-COOL
coolant mixture to the bottom of
the fill neck. The top chamber
needs to be completely full. Fill
the surge tank bottom chamber
through the service port to
approximately half.
4. With the coolant surge tank pressure cap off and the surge
tank service port cap open, start
the engine and let it run until
you can feel the upper radiator
hose getting hot. Watch out for
the engine cooling fan(s).
By this time, the coolant level
inside the coolant surge tank top
chamber may be lower. If the
level is lower, add more of the
proper DEX-COOL coolant
mixture to the surge tank top
chamber until the level reaches
the bottom of the fill neck.
5. Replace the surge tank pressure cap tightly and close the surge
tank service port cap.Caution
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.
Check the level in the surge tank top
and bottom chambers when the
cooling system has cooled down.
If the coolant is not at the proper
levels, repeat Steps 1–3 and reinstall
the pressure cap and close the service
port. If the coolant still is not at the
proper levels when the system cools
down again, see your dealer.
Engine Overheating
The vehicle has an indicator to warn
of the engine overheating.
If the decision is made not to lift the
hood when this warning appears, get
service help right away.
If the decision is made to lift the
hood, make sure the vehicle is parked
on a level surface.

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-MidEast-10293089) -
2017 - crc - 6/22/16
268 VEHICLE CARE
Then check to see if the engine
cooling fan is running. If the engine is
overheating, the fan should be
running. If it is not, do not continue
to run the engine. Have the vehicle
serviced.
Caution
Running the engine without coolant
may cause damage or a fire. Vehicle
damage would not be covered by
the vehicle warranty.
If Steam Is Coming from the
Engine Compartment
{Warning
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. Just turn it off and
get everyone away from the vehicle(Continued)
Warning (Continued)
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 engine
is overheated, the liquids in it can
catch fire. You or others could be
badly burned. Stop the engine if it
overheats, and get out of the
vehicle until the engine is cool.
If Steam Is Coming from the
Engine Compartment with No
Overheat Warning
(V-Series Only)
The V-Series hood vent is functional,
and will allow water from rain and car
washes to enter the engine
compartment and contact hot
surfaces. If steam is seen coming from
the hood vent with no accompanying
overheat warning, no action is
required.
If No Steam Is Coming from the
Engine Compartment
If an engine overheat warning is
displayed but no steam can be seen or
heard, the problem may not be too
serious. Sometimes the engine can get
a little too hot when the vehicle:
.Climbs a long hill on a hot day.
. Stops after high-speed driving.
. Idles for long periods in traffic.
If the overheat warning is displayed
with no sign of steam: 1. Turn the air conditioning off.
2. Turn the heater on to the highest temperature and to the highest
fan speed. Open the windows as
necessary.
3. When it is safe to do so, pull off the road, shift to P (Park) or
N (Neutral) and let the
engine idle.
If the overheat warning no longer
displays, the vehicle can be driven.
Continue to drive the vehicle slowly
for about 10 minutes. Keep a safe
vehicle distance from the vehicle in
front. If the warning does not come

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-MidEast-10293089) -
2017 - crc - 6/22/16
INDEX 345
Engine (cont'd)Oil Life System . . . . . . . . . . . . . . . . . . . . 259
Oil Messages . . . . . . . . . . . . . . . . . . . . . . 140
Oil Pressure Light . . . . . . . . . . . . . . . . . 129
Overheating . . . . . . . . . . . . . . . . . . . . . . . 267
Power Messages . . . . . . . . . . . . . . . . . . 140
Running While Parked . . . . . . . . . . . 203
Starting . . . . . . . . . . . . . . . . . . . . . . . . 19, 198
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 163
Event Data Recorders . . . . . . . . . . . . . . 340
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 163
Extended Parking . . . . . . . . . . . . . . . . . . . 201
Exterior Lamp Controls . . . . . . . . . . . . 157
Exterior Lamps Off Reminder . . . . . . 159
Exterior Lighting Battery Saver . . . . 164
F
Features Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Filter, Engine Air Cleaner . . . . . . . . . . . . . . . . 261
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . 159
Flashers, Hazard Warning . . . . . . . . . . 161
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
Fluid Automatic Transmission . . . . . . . . . 260
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269 Forward Automatic Braking . . . . . . . . 237
Forward Collision Alert (FCA)
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235
Front Seats Heated and Ventilated . . . . . . . . . . . . . 60
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242 Additives . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Economy Driving . . . . . . . . . . . . . . . . . . . 26
Filling a Portable Fuel
Container . . . . . . . . . . . . . . . . . . . . . . . . 245
Filling the Tank . . . . . . . . . . . . . . . . . . . 243
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Low Fuel Warning Light . . . . . . . . . 129
System Messages . . . . . . . . . . . . . . . . . 141
Fuses Engine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
Fuses and Circuit Breakers . . . . . . . 278
Instrument Panel Fuse Block . . . . 282
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284
G
Gauges
Boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Engine Coolant Temperature . . . . 120
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Speedometer . . . . . . . . . . . . . . . . . . . . . . 118 Gauges (cont'd)
Tachometer . . . . . . . . . . . . . . . . . . . . . . . 118
Trip Odometer . . . . . . . . . . . . . . . . . . . . 118
Warning Lights and
Indicators . . . . . . . . . . . . . . . . . . . . . . . . 113
General Information Service and Maintenance . . . . . . . . 323
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245
Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . 248
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
H
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . 275
Hazard Warning Flashers . . . . . . . . . . 161
Head Restraints . . . . . . . . . . . . . . . . . . . . . . 53
Head-up Display . . . . . . . . . . . . . . . . . . . . 135
Headlamps Adaptive ForwardLighting (AFL) . . . . . . . . . . . . . . . . . . . 160
Aiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Automatic . . . . . . . . . . . . . . . . . . . . . . . . . 160
Bulb Replacement . . . . . . . . . . . . . . . . 275
Daytime Running Lamps (DRL) . . . . . . . . . . . . . . . . . . . . 159
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . 159
High Intensity Discharge (HID) Lighting . . . . . . . . . . . . . . . . . . . 276
High-Beam On Light . . . . . . . . . . . . . . 130
High/Low Beam Changer . . . . . . . . . 159

Cadillac CTS/CTS-V Owner Manual (GMNA-Localizing-MidEast-10293089) -
2017 - crc - 6/22/16
348 INDEX
O
Object Detection SystemMessages . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Off-Road Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
Engine Oil Life System . . . . . . . . . . . 259
Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Pressure Light . . . . . . . . . . . . . . . . . . . . . 129
Older Children, Restraints . . . . . . . . . . . 83
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Overheating, Engine . . . . . . . . . . . . . . . . 267
P
Park Shifting Into . . . . . . . . . . . . . . . . . . . . . . 200
Shifting Out of . . . . . . . . . . . . . . . . . . . . 201
Parking Brake and P (Park)Mechanism Check . . . . . . . . . . . . . . . 274
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Over Things That Burn . . . . . . . . . . . 201
Parking Assist . . . . . . . . . . . . . . . . . . . . . . . 228
Parking Brake Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Parking or Backing
Assistance Systems . . . . . . . . . . . . . . . 228
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Passenger Compartment Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Passenger Sensing System . . . . . . . . . . 77
Performance Data
Recorder (PDR) . . . . . . . . . . . . . . . . . . . . 165
Personalization Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Power Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Protection, Battery . . . . . . . . . . . . . . . . 164
Retained Accessory (RAP) . . . . . . . . 200
Seat Adjustment . . . . . . . . . . . . . . . . . . . . 54
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Pregnancy, Using Safety Belts . . . . . . 69
Privacy Vehicle Data Recording . . . . . . . . . . 340
R
Reading Lamps . . . . . . . . . . . . . . . . . . . . . 162
Rear Camera Mirror . . . . . . . . . . . . . . . . . 45
Rear Climate Control System . . . . . . 177
Rear Seat Pass-Through Door . . . . . . . 64
Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Rear Seats (cont'd)
Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Rear Vision Camera (RVC) . . . . . . . . . 228
Rear Window Sunshade . . . . . . . . . . . . . 49
Rearview Mirrors Automatic Dimming . . . . . . . . . . . . . . . . 45
Reclining Seatbacks . . . . . . . . . . . . . . . . . 57
Recommended Fluids and Lubricants . . . . . . . . . . . . . . . . . . . . . . . . . 331
Records Maintenance . . . . . . . . . . . . . . . . . . . . . . 334
Recreational Vehicle Towing . . . . . . . 313
Remote Keyless Entry (RKE) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Remote Vehicle Start . . . . . . . . . . . . . . . . 34
Replacement Bulbs . . . . . . . . . . . . . . . . . 277
Replacement Parts Airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Maintenance . . . . . . . . . . . . . . . . . . . . . . 332
Replacing Airbag System . . . . . . . . . . . . 82
Replacing LATCH System Parts after a Crash . . . . . . . . . . . . . . . . . . . . . . . . 95
Replacing Safety Belt System
Parts after a Crash . . . . . . . . . . . . . . . . . 70
Restraints Where to Put . . . . . . . . . . . . . . . . . . . . . . . . 88
Retained Accessory Power (RAP) . . . . . . . . . . . . . . . . . . . . . . . 200