engine overheat CADILLAC XT5 2018 User Guide

Cadillac XT5 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349110) - 2018 - CRC - 9/28/17
VEHICLE CARE 259
2. Coolant Surge Tank andPressure Cap
{Warning
An underhood electric fan 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
Do not touch heater or radiator
hoses, or other engine parts. They
can be very hot and can burn you.
Do not run the engine if there is a
leak; all coolant could leak out.
That could cause an engine fire and
can burn you. Fix any leak before
driving the vehicle.
Engine Coolant
The engine cooling system in the
vehicle are filled with DEX-COOL
engine coolant mixture. This coolant
needs to be checked and changed at
appropriate levels. See Recommended
Fluids and Lubricants 0337 and
Maintenance Schedule 0330.
The following explains the cooling
systems and how to check and add
coolant when it is low. If there is a
problem with engine overheating, see
Engine Overheating 0261.
What to Use
{Warning
Do not touch heater or radiator
hoses, or other engine parts. They
can be very hot and can burn you.
Do not run the engine if there is a
leak; all coolant could leak out.
That could cause an engine fire and
can burn you. Fix any leak before
driving the vehicle. 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
Do not use anything other than a
mix of DEX-COOL coolant that
meets GM Standard GMW3420 and
clean, drinkable water. Anything
else can cause damage to the
engine cooling system and the
vehicle, which would not be covered
by the vehicle warranty.

Cadillac XT5 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349110) - 2018 - CRC - 9/28/17
260 VEHICLE CARE
Never dispose of engine coolant by
putting it in the trash, pouring it on
the ground, or pouring 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.
Check to see if coolant is visible in the
coolant surge tank. If the coolant
inside the coolant surge tank isboiling, do not do anything else until
it cools down. If coolant is visible but
the coolant level mark is not at or
above the indicated mark, add a 50/
50 mixture of clean, drinkable water
and DEX-COOL coolant. Be sure the
cooling system is cool before this is
done. See
Engine Overheating 0261.
The coolant surge tank is located in
the engine compartment on the driver
side of the vehicle. See Engine
Compartment Overview 0253.
How to Add Coolant to the
Surge Tank
{Warning
Spilling coolant on hot engine parts
can burn you. Coolant contains
ethylene glycol and it will burn if
the engine parts are hot enough.
{Warning
Steam and scalding liquids from a
hot cooling system are under
pressure. Turning the pressure cap,
even a little, can cause them to
come out at high speed and you
could be burned. Never turn the cap
when the cooling system, including
the pressure cap, is hot. Wait for
the cooling system and pressure
cap to cool.
Caution
Failure to follow the specific
coolant fill procedure could cause
the engine to overheat and could
cause system damage. If coolant is
not visible in the surge tank,
contact your dealer.
The coolant surge tank pressure cap
can be removed when the cooling
system, including the surge tank
pressure cap and upper radiator hose,
is no longer hot.

Cadillac XT5 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349110) - 2018 - CRC - 9/28/17
VEHICLE CARE 261
1. Turn the pressure cap slowlycounterclockwise. If a hiss is
heard, wait for that to stop.
A hiss means there is still some
pressure left.
2. Keep turning the pressure cap slowly and remove it.
3. Fill the coolant surge tank withthe proper mixture to the mark
pointed to on the front 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. 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 mark pointed to on the front
of the coolant surge tank.
5. Replace the pressure cap tightly.
6. Verify coolant level after the engine is shut off and the
coolant is cold. If necessary,
repeat coolant fill procedure
Step 1-–6.Caution
If the pressure cap is not tightly
installed, coolant loss and engine
damage may occur. Be sure the cap
is properly and tightly secured.
Engine Overheating
The vehicle has several indicators to
warn of the engine overheating.
There is an engine coolant
temperature gauge and an engine
coolant temperature warning light on
the instrument cluster. See Engine
Coolant Temperature Gauge 0129 and
Engine Coolant Temperature Warning
Light 0138. The vehicle may also
display a message on the Driver
Information Center (DIC).
If the decision is made not to lift the
hood when this warning appears, get
service help right away. See Roadside
Service 0347.
If the decision is made to lift the
hood, make sure the vehicle is parked
on a level surface. Then check to see if
the engine cooling fan is running.

Cadillac XT5 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349110) - 2018 - CRC - 9/28/17
262 VEHICLE CARE
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
Do not run the engine if there is a
leak in the engine cooling system.
This can cause a loss of all coolant
and can damage the system and
vehicle. Have any leaks fixed
right away.
If Steam Is Coming from the
Engine Compartment
{Warning
Steam and scalding liquids from a
hot cooling system are under
pressure. Turning the pressure cap,
even a little, can cause them to
come out at high speed and you
could be burned. Never turn the cap
when the cooling system, including(Continued)
Warning (Continued)
the pressure cap, is hot. Wait for
the cooling system and pressure
cap to cool.
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 engine coolant temperature
gauge is no longer in the overheated
area or the engine coolant
temperature warning light no longer
displays, the vehicle can be driven.
Continue to drive the vehicle slowly
for about 10 minutes. Keep a safe
distance from the vehicle in front.
If the warning does not come back on,
continue to drive normally and have
the cooling system checked for proper
fill and function.
If the warning continues, pull over,
stop, and park the vehicle right away.
If there is no sign of steam, idle the
engine for three minutes while parked.
If the warning is still displayed, turn
off the engine until it cools down.

Cadillac XT5 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349110) - 2018 - CRC - 9/28/17
INDEX 371
E
Electric Parking Brake . . . . . . . . . . . . . . 203
Electric Parking Brake Light . . . . . . . 135
Electrical Equipment, Add-On . . . . . 248
Electrical SystemEngine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272
Fuses and Circuit Breakers . . . . . . . 272
Instrument Panel Fuse Block . . . . 275
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . 271
Rear Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . 257
Check Light (MalfunctionIndicator) . . . . . . . . . . . . . . . . . . . . . . . . 133
Compartment Overview . . . . . . . . . . 253
Coolant Temperature Gauge . . . . . 129
Coolant Temperature
Warning Light . . . . . . . . . . . . . . . . . . . 138
Cooling System . . . . . . . . . . . . . . . . . . . 258
Drive Belt Routing . . . . . . . . . . . . . . . . 342
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
Oil Life System . . . . . . . . . . . . . . . . . . . . 256
Oil Pressure Gauge . . . . . . . . . . . . . . . . 128 Engine (cont'd)
Oil Pressure Light . . . . . . . . . . . . . . . . . 139
Overheating . . . . . . . . . . . . . . . . . . . . . . . 261
Power Messages . . . . . . . . . . . . . . . . . . 147
Running While Parked . . . . . . . . . . . 196
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . 165
Equipment, Towing . . . . . . . . . . . . . . . . . 245
Event Data Recorders . . . . . . . . . . . . . . 355
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . 165
Extended Parking . . . . . . . . . . . . . . . . . . . 195
Extender, Seat Belt . . . . . . . . . . . . . . . . . . 76
Exterior Lamp Controls . . . . . . . . . . . . 160
Exterior Lamps Off Reminder . . . . . . 162
Exterior Lighting Battery Saver . . . . 166
F
Features Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Filter, Engine Air Cleaner . . . . . . . . . . . . . . . . 257
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . 162
Flashers, Hazard Warning . . . . . . . . . . 163
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300 Changing . . . . . . . . . . . . . . . . . . . . . . . . . . 308
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
Fluid Automatic Transmission . . . . . . . . . 257 Fluid (cont'd)
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . 49
Forward Automatic Braking . . . . . . . . 229
Forward Collision Alert (FCA)
System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
Front Pedestrian Braking (FPB) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Front Seats Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Heated and Ventilated . . . . . . . . . . . . . 64
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236 Additives . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Economy Driving . . . . . . . . . . . . . . . . . . . 25
Filling a Portable FuelContainer . . . . . . . . . . . . . . . . . . . . . . . . 239
Filling the Tank . . . . . . . . . . . . . . . . . . . 238
Foreign Countries . . . . . . . . . . . . . . . . . 237
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Low Fuel Warning Light . . . . . . . . . 140
Requirements, California . . . . . . . . . 237
Fuses Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272
Fuses and Circuit Breakers . . . . . . . 272

Cadillac XT5 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
11349110) - 2018 - CRC - 9/28/17
374 INDEX
Manual Mode . . . . . . . . . . . . . . . . . . . . . . . 200
Memory Features . . . . . . . . . . . . . . . . . . . . 11
Memory Seats . . . . . . . . . . . . . . . . . . . . . . . . 62
MessagesEngine Power . . . . . . . . . . . . . . . . . . . . . 147
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
Vehicle Speed . . . . . . . . . . . . . . . . . . . . . 148
Mirror Rear Camera . . . . . . . . . . . . . . . . . . . . . . . . 51
Mirrors Automatic Dimming . . . . . . . . . . . . . . . . 50
Automatic Dimming Rearview . . . . . 51
Convex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Folding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Heated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Manual Rearview . . . . . . . . . . . . . . . . . . . 51
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Tilt in Reverse . . . . . . . . . . . . . . . . . . . . . . 50
Mirrors, Interior Rearview . . . . . . . . . . . 51
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207 Driver Control . . . . . . . . . . . . . . . . . . . . . 207
Monitor System, Tire Pressure . . . . . 288
N
Navigation OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
Net, Convenience . . . . . . . . . . . . . . . . . . . 111
New Vehicle Break-In . . . . . . . . . . . . . . . 188
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Off-Road Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
Engine Oil Life System . . . . . . . . . . . 256
Engine Oil Pressure Gauge . . . . . . . 128
Pressure Light . . . . . . . . . . . . . . . . . . . . . 139
Older Children, Restraints . . . . . . . . . . . 89
Online Owner Center . . . . . . . . . . . . . . . 346
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356
OnStar Additional Information . . . . 363
OnStar Connections . . . . . . . . . . . . . . . . 360
OnStar Diagnostics . . . . . . . . . . . . . . . . . 362
OnStar Emergency . . . . . . . . . . . . . . . . . . 358
OnStar Navigation . . . . . . . . . . . . . . . . . . 359
OnStar Overview . . . . . . . . . . . . . . . . . . . . 357
OnStar Security . . . . . . . . . . . . . . . . . . . . . 359
Ordering Service Publications . . . . . . . . . . . . . . 352
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Overheating, Engine . . . . . . . . . . . . . . . . 261
P
Park Shifting Into . . . . . . . . . . . . . . . . . . . . . . 193
Shifting Out of . . . . . . . . . . . . . . . . . . . . 194
Parking
Brake and P (Park)Mechanism Check . . . . . . . . . . . . . . . 266
Extended . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Over Things That Burn . . . . . . . . . . . 194
Parking Assist . . . . . . . . . . . . . . . . . . . . . . . 220
Parking or Backing
Assistance Systems . . . . . . . . . . . . . . . 220
Passenger Airbag Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Passenger Compartment Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Passenger Sensing System . . . . . . . . . . 83
Pedestrian Ahead Indicator . . . . . . . . 137
Perchlorate Materials Requirements, California . . . . . . . . . 251
Personalization Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Power Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Protection, Battery . . . . . . . . . . . . . . . . 166
Retained Accessory (RAP) . . . . . . . . 193