1999 CADILLAC CATERA heater

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5-12
If it isn't, you may have a leak in the radiator hoses,
heater hoses, radiator, water pump or somewhere else in
the cooling system.
CAUTION:
Heater and radiator hoses, and other engine
parts, can be very hot. Don't touch them. If you
do, you can be burned.
Don't 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.
NOTICE:
Engine damage from running your engine
without coolant isn't covered by your warranty.
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.
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 aren't, your vehicle needs service.

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5-14
CAUTION:
Adding only plain water to your cooling system
can be dangerous. Plain water, or some other
liquid like 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 wouldn't
get the overheat warning. Your engine could
catch fire 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.
So use the recommended coolant.
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. Don't spill coolant on a hot engine.

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6-21
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.
What to Use
Use a mixture of one-half clean, drinkable water and
one
-half DEX-COOL
coolant which won't damage
aluminum parts. If you use this coolant mixture, you
don't need to add anything else.
CAUTION:
Adding only plain water to your cooling system
can be dangerous. Plain water, or some other
liquid like 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 wouldn't
get the overheat warning. Your engine could
catch fire and you or others could be burned. Use
a 50/50 mixture of clean, drinkable water and
DEX
-COOL
coolant.

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6-22
NOTICE:
If you use an improper coolant mixture, your
engine could overheat and be badly damaged.
The repair cost wouldn't be covered by your
warranty. Too much water in the mixture can
freeze and crack the engine, radiator, heater core
and other parts.
If you have to add coolant more than four times a year,
have your dealer check your cooling system.
NOTICE:
If you use the proper coolant, you don't have to
add extra inhibitors or additives which claim to
improve the system. These can be harmful.
Checking Coolant
The surge tank is located behind the air cleaner on the
passenger's side of the engine.
The cooling system when hot is under a lot of pressure.
If the low coolant warning light on the instrument panel
appears, you will need to add coolant.

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6-58
Fuse Usage
4 RH and LH Rear Seat Cushion Heater
Relay, Rear Sunshade Motor
5 Transmission Control Module
6 Radio Speaker Amplifier
7 RH and LH Rear Side Door Window
Regulator Motor
8 Headlamp Switch, Turn Signal Switch,
Horn Relay, CD Changer,
Multifunction Relay
9 Windshield Wiper Motor and Relay,
Windshield Wiper and Windshield
Washer Switch
10 Body Control Module (BCM), Heater
Water Auxiliary Pump, Fan Control
Relays, Auxiliary Water Pump Relay
11 Heater and A/C Control, RH and LH
Outside Rearview Mirrors
12 Hazard Warning Switch, Instrument
Cluster, Data Link Connector (DLC),
Stoplamp Switch, Gage Cluster, Heater
and A/C Control.
13 Remote Control Outside Rearview Mirror
Switch, A/C Compressor Relay, Coolant
Fan Test Connector, A/C Load SwitchFuse Usage
14 Cellular Telephone, RH and LH
Windshield Washer Nozzles, Driver and
Passenger Heated Seat Switch, Heater and
A/C Control, Heated Outside Rearview
Mirror and Rear Window Defogger Relay
15 Rear Suspension Leveling Air
Compressor Relay, Instrument Cluster,
Gage Cluster, Cruise Control Switch,
Headlamp Switch, Multifunction Relay,
Passenger and Driver Heated Seat Relay,
BCM, Sunroof Actuator, Automatic Level
Control Sensor, RH and LH Heated Rear
Seat Switch, RH and LH Heated Rear
Seat Cushion Relay, Driver Seat Adjuster
Memory Module, LH Front Side Door
Window Switch, Inside Rearview Mirror
16 Cigarette Lighter (Front and Console)
17 Horn #1 and #2
18 Fuel Pump
19 Electronic Brake/Traction Control
Module
20 Passenger and Driver Heated Seat Relay
21 Daytime Running Lamp (DRL) Relay,
LH High
-Beam Headlamp Relay

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6-59
Fuse Usage
22 Headlamp Switch, LH
Low
-Beam Headlamp
23 LH Parking Lamp and Turn Signal
Lamps, LH Rear Sidemarker Lamp,
Multifunction Relay, LH Stoplamp
and Taillamp
24 Lifting Magnet, BCM, Gage Cluster
25 Sunroof Actuator
26 Headlamp Switch, RH and LH Front
Sidemarker Lamp, Middle Taillamp, RH
and LH Rear License Plate Lamp, Radio,
Automatic Transmission Control
Indicator, Heater and A/C Control
27 Automatic Level Control Sensor, Rear
Suspension Leveling Air Compressor
and RelayFuse Usage
28 Door Lock Relay, OnStar

Connector
29 Multifunction Relay
30 RH Parking Lamp and Turn Signal Lamp,
RH Rear Sidemarker Lamp, RH
Stoplamp and Taillamp
31 RH Low
-Beam Headlamp Turn
Signal Switch
32 RH High
-Beam Headlamp Relay
33 Blower Controller, A/C
Compressor Relay
34 Heated Rear Window Defogger Relay
35 Passenger Seat Adjuster Switch, Driver
Seat Adjuster Memory Module

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8-3
Leather 6-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outside of the Windshield and Wiper Blades 6-48 . . . . . . .
Outside of Your Vehicle 6-49 . . . . . . . . . . . . . . . . . . . . . . . .
Speaker Covers 6-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tires 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Top of the Instrument Panel 6-47 . . . . . . . . . . . . . . . . . . . . .
Vinyl 6-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheels 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Climate Control System 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clock, Setting the 3-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cluster, Instrument Panel 2-62 . . . . . . . . . . . . . . . . . . . . . . . . .
Comfort Controls 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comfort Controls and Audio Systems 3-1 . . . . . . . . . . . . . . . .
Compact Disc Changer Errors 3-26 . . . . . . . . . . . . . . . . . . . . .
Compartments, Storage 2-49 . . . . . . . . . . . . . . . . . . . . . . . . . .
Console Shift Lever 2-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Console Storage 2-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control of a Vehicle 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convenience Net 2-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convex Outside Mirror 2-49 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 6-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding 6-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking 6-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater, Engine 2-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Add to the Coolant Surge Tank 5-13 . . . . . . . . . . . .
Surge Tank 5-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What to Use 6-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling System 5-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cornering Lamps 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Courtesy Transportation 7-8 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control 2-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control Light 2-74 . . . . . . . . . . . . . . . . . . . . . . . . . . . . Customer Assistance
Information 7
-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offices 7-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Text Telephone (TTY) Users 7-3 . . . . . . . . . . . . . . . . . . . . .
Customer Satisfaction Procedure 7-2 . . . . . . . . . . . . . . . . . . . .
Damage, Finish 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Damage, Sheet Metal 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Daytime Running Lamps (DRL) 2-42 . . . . . . . . . . . . . . . . . . .
Dead Battery 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defects, Reporting Safety 7-10, 7-11 . . . . . . . . . . . . . . . . . . .
Defensive Driving 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defogger, Rear Window 3-7 . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrosting 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions, Vehicle 6-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dolby Noise Reduction 3-13, 3-20 . . . . . . . . . . . . . . . . . . . . .
Door
Central Unlocking System 2
-4 . . . . . . . . . . . . . . . . . . . . . . .
Locks 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DRIVE (D), Automatic Transmission 2-23 . . . . . . . . . . . . . . .
Driver Position 1-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver's Side Instrument Panel Fuse Block 6-57 . . . . . . . . . . .
Driver's Side Temperature Knob 3-2 . . . . . . . . . . . . . . . . . . . .
Driving
City 4
-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defensive 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drunken 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Freeway 4-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In a Blizzard 4-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In Foreign Countries 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
In Rain and on Wet Roads 4-17 . . . . . . . . . . . . . . . . . . . . . .

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8-4
Driving (Continued)
Night 4-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Curves 4-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Grades While Towing a Trailer 4-36 . . . . . . . . . . . . . . .
On Hill and Mountain Roads 4-23 . . . . . . . . . . . . . . . . . . . .
On Snow or Ice 4-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Through Deep Standing Water 4-19 . . . . . . . . . . . . . . . . . . .
Winter 4-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
With a Trailer 4-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Equipment, Adding 2-19 . . . . . . . . . . . . . . . . . . . .
Electrical System 6-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrochromic Day/Night Rearview Mirror 2-47 . . . . . . . . . .
Electronic Climate Control (ECC) 3-2 . . . . . . . . . . . . . . . . . . .
Electronic Level Control 4-30 . . . . . . . . . . . . . . . . . . . . . . . . .
Emergency Trunk Release 2-12 . . . . . . . . . . . . . . . . . . . . . . . .
Engine 6-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner/Filter 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compartment Relay Center 6-61 . . . . . . . . . . . . . . . . . . . . .
Coolant 6-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Heater 2-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Temperature Gage 2-69 . . . . . . . . . . . . . . . . . . . . .
Coolant Temperature Warning Light 2-68 . . . . . . . . . . . . . .
Cooling When Trailer Towing 4-37 . . . . . . . . . . . . . . . . . . .
Exhaust 2-11, 2-30, 2-31, 4-28 . . . . . . . . . . . . . . . . . . . . . .
Identification 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overheating 5-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Running While You're Parked 2-31 . . . . . . . . . . . . . . . . . . .
Specifications 6-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speed Limiter 2-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your 2-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine Oil 6
-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additives 6-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking 6-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What Kind to Use 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What to do with Used 6-14 . . . . . . . . . . . . . . . . . . . . . . . . . .
When to Add 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
When to Change 6-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
English/Metric Display 3-3 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ethanol 6-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust, Engine 2-11, 2-30, 2-31, 4-28 . . . . . . . . . . . . . . . . .
Extender, Safety Belts 1-52 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lamps 2-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Button, Climate Control System 3-2 . . . . . . . . . . . . . . . .
Features and Controls 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filling a Portable Fuel Container 6-8 . . . . . . . . . . . . . . . . . . . .
Filling Your Tank 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter, Air 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter Replacement, Passenger Compartment Air 6-17 . . . . . .
Finish Care 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Finish Damage 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FIRST (1) Gear, Automatic Transmission 2-23 . . . . . . . . . . . .
Flashers, Hazard Warning 5-2 . . . . . . . . . . . . . . . . . . . . . . . . .
Flash-To-Pass 2-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flat Tire, Changing 5-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Floor Mats 2-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid
Brake 6
-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Steering 6-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Washer 6-25 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fog Lamps 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .