coolant temperature CADILLAC DEVILLE 1999 7.G User Guide

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5-11
If you get the overheat warning with no sign of steam,
try this for a minute or so:
1. If your air conditioner is on, turn it off.
2. Dial temperature control to the highest heat setting
and open the windows, as necessary.
3. If you're in a traffic jam, shift to NEUTRAL (N);
otherwise, shift to the highest gear while
driving
-- OVERDRIVE (
) or THIRD (3).
If you no longer have the overheat warning, you can
drive. Just to be safe, drive slower for about 10 minutes.
If the warning doesn't come back on, you can
drive normally.
If the warning continues, pull over, stop, and park your
vehicle right away.
If there's still no sign of steam, idle the engine for three
minutes while you're parked. If you still have the
warning, turn off the engine and get everyone out of the
vehicle until it cools down. Also, see ªOverheated
Engine Protection Operating Modeº listed previously in
this section.
You may decide not to lift the hood but to get service
help right away.
Cooling System
When you decide it's safe to lift the hood, here's what
you'll see:
A. Coolant Surge Tank with Pressure Cap
B. Electric Engine Fans

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6-22 How to Reset Transaxle Fluid
Change Indicator
Your vehicle is equipped with a transaxle fluid change
indicator. A CHANGE TRANS FLUID message will
display on the Driver Information Center (DIC) when
the powertrain computer determines that the transaxle
fluid needs to be changed or at each 100,000 miles
(160 000 km) interval, whichever occurs first. When this
message appears, change the transaxle fluid and reset
the transaxle fluid life indicator as follows:
1. Turn the ignition on but do not start the engine.
2. Press and hold the OFF and rear defog buttons on the
climate control at the same time until the TRANS
FLUID RESET message appears on the DIC.
Surge Tank Pressure Cap
NOTICE:
The surge tank cap is a 15 psi (105 kPa)
pressure
-type cap and must be tightly installed to
prevent coolant loss and possible engine damage
from overheating. Be sure the arrows on the
cap line up.
If the surge tank pressure cap needs to be replaced, a
GM cap is recommended.
Thermostat
Engine coolant temperature is controlled by a thermostat
in the engine coolant system. The thermostat stops the
flow of coolant through the radiator until the coolant
reaches a preset temperature.
If your thermostat needs to be replaced, a GM
thermostat is recommended.

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6-23
Engine Coolant
The cooling system in your vehicle is filled with
DEX
-COOL
engine coolant. This coolant is designed
to remain in your vehicle for 5 years or 150,000 miles
(240 000 km), whichever occurs first, if you add only
DEX
-COOL
extended life coolant.
The following explains your cooling system and how to
add coolant when it is low. If you have a problem with
engine overheating, see ªEngine Overheatingº in
the Index.
A 50/50 mixture of clean, drinkable water and
DEX
-COOL
coolant will:

Give freezing protection down to
-34F (-37C).

Give boiling protection up to 265F (129C).

Protect against rust and corrosion.

Help keep the proper engine temperature.

Let the warning lights and gages work as
they should.
NOTICE:
When adding coolant, it is important that you use
only DEX
-COOL (silicate-free) coolant.
If coolant other than DEX-COOL is added to the
system, premature engine, heater core or
radiator corrosion may result. In addition, the
engine coolant will require change sooner
-- at
30,000 miles (50 000 km) or 24 months,
whichever occurs first. Damage caused by the use
of coolant other than DEX
-COOL is not
covered by your new vehicle warranty.

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8-5
Engine 6-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner/Filter 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 6-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Heater 2-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Hot, Idle Engine Message 2-85 . . . . . . . . . . . . . . .
Coolant Temperature Gage 2-73 . . . . . . . . . . . . . . . . . . . . .
Coolant Temperature Warning Light 2-72 . . . . . . . . . . . . . .
Exhaust 2-33, 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Identification 6-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Misfire, Ease Off Gas Pedal Message 2-85 . . . . . . . . . . . . .
Overheated, Stop Engine Message 2-85 . . . . . . . . . . . . . . . .
Overheating 5-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Reduced Message 2-85 . . . . . . . . . . . . . . . . . . . . . . .
Running While Parked 2-33, 4-28 . . . . . . . . . . . . . . . . . . . .
Specifications 6-69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your 2-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Cooling When Trailer Towing 4-39 . . . . . . . . . . . . . . .
Engine Hot - A/C Off Message 2-85 . . . . . . . . . . . . . . . . . . . .
Engine Oil 6-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additives 6-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Used 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What Kind of Oil to Use 6-13 . . . . . . . . . . . . . . . . . . . . . . .
When to Change 6-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Speed Limiter 2-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
English/Metric Button 2-66 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ethanol 6-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust, Engine 2-33, 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Express-Down Window 2-35 . . . . . . . . . . . . . . . . . . . . . . . . . . Extender, Safety Belts 1
-53 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lamps 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lighting Battery Saver 2-46 . . . . . . . . . . . . . . . . . . . .
Fabric Cleaning 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Button 3-2, 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filling a Portable Fuel Container 6-8 . . . . . . . . . . . . . . . . . . . .
Filling Your Tank 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter, Engine Air Cleaner 6-16 . . . . . . . . . . . . . . . . . . . . . . . .
Finish Care 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Finish Damage 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
First Gear, Automatic Transaxle 2-25 . . . . . . . . . . . . . . . . . . .
Flashers, Hazard Warning 5-2 . . . . . . . . . . . . . . . . . . . . . . . . .
Flash-To-Pass 2-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flat Tire, Changing 5-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Floor Mats 2-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid
Automatic Transaxle 6
-19 . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake 6-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Capacities 6-70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Steering 6-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Washer 2-39, 6-27 . . . . . . . . . . . . . . . . . . . . . .
Fog Lamps 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Foreign Countries, Fuel 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Freeway Driving 4-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
French Language Manual ii. . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Storage Area 2
-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Turn Signal Lamps, Bulb Replacement 6-38 . . . . . . . . .

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8-6
Fuel 6-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Canada 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Panel 2-78 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Release 6-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filling a Portable Container 6-8 . . . . . . . . . . . . . . . . . . . . . .
Filling Your Tank 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gage 2-77 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In Foreign Countries 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Level Low Message 2-85 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuses
Circuit Breakers 6
-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Compartment 6-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Underhood 6-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Wipers 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gages
Engine Coolant Temperature 2-73 . . . . . . . . . . . . . . . . . . . .
Fuel 2-77 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tachometer 2-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GAWR 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gear Positions, Automatic Transaxle 2-23 . . . . . . . . . . . . . . . .
Glove Box 2-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GM Mobility Program for Persons with Disabilities 7-5 . . . . .
Gross Axle Weight Rating (GAWR) 4-30 . . . . . . . . . . . . . . . .
Gross Vehicle Weight Rating (GVWR) 4-30 . . . . . . . . . . . . . .
Guide en Fran†ais ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GVWR 4
-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Halogen Bulbs 6-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handles, Assist 2-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hazard Warning Flashers 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . . Head Restraints 1
-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlamps 2-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Aiming 6-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High/Low Beam 2-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Suggested Message 2-85 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiper Activated 2-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hearing, Damage 3-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hearing Impaired, Customer Assistance 7-3 . . . . . . . . . . . . . .
Heated Front Seats 1-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heating 3-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Highway Hypnosis 4-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hill and Mountain Road Driving 4-23 . . . . . . . . . . . . . . . . . . .
Hitches 4-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hood
Checking Things Under 6
-8 . . . . . . . . . . . . . . . . . . . . . . . . .
Release 6-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn 2-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Add Coolant to the Coolant Surge Tank 5-13 . . . . . . .
How to Reset the Oil Life Indicator 6-15 . . . . . . . . . . . . . . . . .
HVAC Steering Wheel Controls 3-13 . . . . . . . . . . . . . . . . . . .
Hydraulic Brake Warning Lights 2-69 . . . . . . . . . . . . . . . . . . .
Hydroplaning 4-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ice Possible Message 2-86 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Positions 2-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Illuminated Entry 2-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inadvertent Power Battery Saver 2-48 . . . . . . . . . . . . . . . . . . .
Indicator, Oil Life 2-95 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inflation, Tire Pressure 6-43 . . . . . . . . . . . . . . . . . . . . . . . . . . .

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8-7
Instrument Panel 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Top 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clusters 2-64, 2-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intensity/Brightness Control 2-46 . . . . . . . . . . . . . . . . . . . .
Interior Lamps 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jack, Tire 5-20, 5-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keyless Entry System, Remote 2-7 . . . . . . . . . . . . . . . . . . . .
Keys 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Labels
Certification 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Parts Identification 6-58 . . . . . . . . . . . . . . . . . . . . .
Tire-Loading Information 4-30 . . . . . . . . . . . . . . . . . . . . . .
Vehicle Identification Number 6-58 . . . . . . . . . . . . . . . . . . .
Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cornering 2
-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Courtesy 2-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Daytime Running Lamps 2-43 . . . . . . . . . . . . . . . . . . . . . . .
Exterior 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fog 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel Intensity/Brightness Control 2-46 . . . . . .
Interior 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Map 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Reminder 2-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading 2-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Underhood 6-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leaving Your Vehicle 2-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Leaving Your Vehicle with the Engine Running 2
-30 . . . . . . .
Level Control, Electronic 4-31 . . . . . . . . . . . . . . . . . . . . . . . . .
Light Sensor 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lighted Visor Vanity Mirror 2-55 . . . . . . . . . . . . . . . . . . . . . .
Lighter 2-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lights
Air Bag Readiness 1
-23, 2-68 . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock Brake System Warning 2-71, 4-7 . . . . . . . . . . . .
Brake System Warning 2-69 . . . . . . . . . . . . . . . . . . . . . . . . .
Charging System 2-69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Coolant Temperature Warning 2-72 . . . . . . . . . . . . .
Interior 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pressure 2-76 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking Brake Indicator 2-70 . . . . . . . . . . . . . . . . . . . . . . . .
Safety Belt Reminder 1-7, 2-68 . . . . . . . . . . . . . . . . . . . . . .
Service Engine Soon 2-73 . . . . . . . . . . . . . . . . . . . . . . . . . .
Traction Control System Warning 2-72, 4-9 . . . . . . . . . . . .
Limiter, Engine Speed 2-67 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limiter, Vehicle Speed 2-66 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Loading Your Vehicle 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lock, Torque 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locks 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lockout Feature 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Door 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Door 2-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programmable Automatic Door 2-5, 2-91 . . . . . . . . . . . . . .
Rear Door Security 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trunk Release 2-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lock/Unlock Confirmation 2-92 . . . . . . . . . . . . . . . . . . . . . . .