1990 HONDA PRELUDE coolant

If the level is between the MIN and MAX marks on the dipstick
add a 50/50 solution of antifreeze and water to bring it up to MAX. If there is no coolant visible on the dipstick, the cooling system
should be checked for leaks and repaired if necessary. Coolantmust then be added to the radiator.

CAUTION:

Radiator coolant will damage paint. Quickly rinse any spilled

coolant from painted surfaces.

Wait until the engine is cool, then turn the radiator cap counterclock-wise until it stops. DO NOT PRESS DOWN WHILE TURNING THECAP. After any remaining pressure has been relieved, remove the
cap by pressing down and again turning it counterclockwise. Add
enough coolant to fill the radiator, and reinstall the cap. Be sure to
tighten it securely. Fill the reserve tank up to the MAX mark with
the engine cold.

Maintenance
1. Check the freeze protection level of the coolant with a hydrometer.
2. Keep the front of the radiator free of dirt and debris.

3. Check hoses and hose clamps regularly.

(cont'd)
MAX
MIN
RESERVE TANKProCarManuals.comMain Menu t s

Cooling System (cont'd)
Thermostat The thermostat in the cooling system does not need to be changedfor summer or winter operation. However, for extremely cold
climates, an optional thermostat is available from your Honda dealer.
Replacing CoolantReplace coolant at 36 months or 45,000 miles (72,000 km),
whichever comes first. Thereafter, replace every 2 years or 30,000
miles (48,000 km), whichever comes first.
RADIATOR COOLANT
REFILL CAPACITY:
including reserve tank 0.75 l (0.198 US gal, 0.165 Imp gal)

Manual transmission 2.0 S: 5.15 l (1.361 US gal, 1.133 Imp gal)
2.0 Si,Si: 6.15 l (1.625 US gal, 1.353 Imp gal)

Automatic transmission 2.0S:5.85 l (1.546 US gal, 1.287 Imp gal)

2.0 Si,Si: 6.15 l (1.625 US gal, 1.353 Imp gal)

1. Set the heater temperature lever to maximum heat.
2. Remove the radiator cap and loosen the drain plug when the radiator is cool, and drain the radiator.
RADIATOR
CAP BLEED BOLT
DRAIN BOLT
3. Remove the drain bolt from the front side of the cylinder block, and drain the engine and heater.
4. Apply non-hardening sealant to the drain bolt threads, then reinstall the bolt and tighten it securely.
5. Tighten the radiator drain plug securely.
DRAIN

PLUGProCarManuals.comMain Menu t s

6. Mix the recommended antifreeze with an equal amount of low-
mineral or distilled water and fill the reservoir to maximum, as
illustrated.
7. Loosen the air bleed bolt in the thermostat housing, then fill the radiator to the filler neck with the coolant mixture. Tighten thebleed bolt as soon as coolant starts to run out in a steady stream
without bubbles.
8. With the radiator cap off, start the engine and let it run until warmed up (fan goes on at least twice). Then, if necessary, addmore coolant mixture to bring the level back up to the filter neck.
9. Put the radiator cap on, then run the engine again and check for
leaks.
Fill to

here

Fill to here

FILLER
NECKProCarManuals.comMain Menu t s

Specifications

* 1 Including the coolant in the reserve tank (0.75 l /0.79US qt/0.66 Imp qt) but excluding that remaining in the engine.

* 2 Excluding the oil remaining in the engine,but including that remaining in the oil filter.

(cont'd)ProCarManuals.comMain Menu t s

Evaporative Emission Control System
The Evaporative Emission Control System is designed to prevent
fuel vapors from escaping into the atmosphere.

(2.0 Si,Si)

Fuel vapors from the fuel tank are directed into the charcoal
canister where they are adsorbed and stored while the engine is
stopped or idling. When the coolant temperature rises to a certain
value, the vapors are drawn into the engine through the throttle body and the intake manifold during normal engine operation.
(2.0 S)Fuel vapors from the fuel tank and carburetor are directed into the
charcoal canister where they are adsorbed and stored while the
engine is stopped.
When the engine is running and engine coolant temperature is above
the set temperature of the thermo sensor, the purge control diaphragm valve is open so that fuel vapors in the charcoal canister may be drawn into the engine through the carburetor and the intake
manifold.
Engine Exhaust Controls
The engine exhaust emission control systems are designed to
control combustion during idle, acceleration, cruise, and deceleration.
These systems are entirely separate from the crankcase and evaporative emission control systems described previously. HONDA PGM-FI System (2.0 Si,Si)
The PGM-FI system consists of three independent sub-systems; Air intake, Electronic Control and Fuel Control, thus allowing moreaccurate control of air/fuel ratios under all operating conditions.
The Electronic Control Unit (ECU) detects the amount of air
drawn into the cylinders and determines the amount of fuel to be injected to provide the optimum air/fuel ratio for all engine needs.

(cont'd)ProCarManuals.comMain Menu t s

Index
(cont'd)
Air Conditioner

Operation.....................................
43

Service.......................................108

Air Filte
r ...........................................95
Air Pressure, Tires........................105
Aluminum Alloy Wheels...............111
Antifreeze ..................See
"Radiator coolant"
Anti Lock Brakes(ALB) ..................18 ALB Warning Light .....................
24

ALB Fluid
.....................................
99
Anti-theft Steering

Column Lock

System.........................................58

Appearance Care .........................
110

Ashtrays..........................................38
Audio System
.................................
47
Automatic Transmission

Driving Technique ......................68

Fluid.............................................87
Operation....................................67

Shift Lever

Position
Indicator .................................
21 Battery
Charging System Warning

Light.......................................23

Jump Starting ...........................119 Maintenance .............................100

Specification ........................... 126

Beeper System Fasten Seat Belt Beeper ............13
Key Reminder .............................58

Light Reminder Chime ................30

Belts,Seat...............See "Seat Belts"
Brake Lamp Warning Light.............25
Brakes Brake Failure Warning Light .......................................23
Brake Fluid...................................99
Brake System Design .................98
Brake Wear .................................98
Brake Wear Indicators................98

Parking Brake ..............................39

Parking Brake Warning Light .......................................23
Break-in Period ..................................2

Bulb

Replacement.............................103
Specification .............................126
Buzzer ............See "Beeper System"
Capacities......................................125

Care and Cleaning.........................110

Catalytic Converter .....................134
Certification Label ........................127

Chains,Tires ................................. 106

Child Restraint System ..................14
Cigarette Lighter .............................38

Clock................................................37

COMPACT Spare Tire .................114Coolant Temperature Gauge .........20
Cooling(with A/C) ...........................44 Cooling System ...............................88
Crankcase Emission ControlSystem ..........................................
130
Cruise Control
Opeartion...................................
35Indicator .....................................22
Defogger.........................................28
Defroster .........................................45

Dimmer Switch, Headlights...........31
Doors
Locks............................................3

Warning Light ............................25
Emergency
Changing Flat Tire ...................116

Hazard Warning System ..........33If the Retractable Headlights do not operate ...................123

If the Sunroof Won't
Close .....................................54
If Your Car Gets Stuck ...........122
Jump Starting .........................119Towing.....................................121Warning and
Indicator

Lights....................................21
ProCarManuals.comMain Menu t s

Index (cont'd)

Emission Controls.........................130

Engine
Coolant.......................................88
Coolant Temperature
Gauge....................................20
Identification Number .............127
Oil and Filter...............................83
Oil Pressure
Warning

Light .......................................22

Specification ...........................125

Exhaust Controls....................131
Engine Exhaust Ga
s Warning

....................................................64

Evaporative Emission Control
System ....................................131
Exhaust Gas Recirculation...........132
Exterior Care.................................110
Filters

Air...........................................94
Engine Oil ...................................84

Fuel.............................................96

Fluid .....................................See "Oil"

Foreign Countries, Operation in ...............................56
Four Wheel Steering.......................59 Front Seat
Adjustment..................................5

Fuel

Filter Door and Cap...................56
Fuel Reserve
Warning

Light .......................................22

Gauge.........................................20

Gasohol......................................55

Gasoline ......................................55

Requirement..............................55

Filter...........................................96
Fuse

Checking and Replacing .........101

Specification...........................126 Gasoline............................See"Fuel"
Gas Station Information
...........................................back cover

Gauges............................................20
Glove Box ........................................39
Hazard Warning

Indicator Light ...........................21
Hazard Warning System................33

Headlights

Flasher.......................................31
Headlight Motor
Switch ...........32

High Beam Indicator..................21
High Beam/Low

Beam

Switch...................................31
If the

Retractable Headlights
do not operate ...................123

Reminder Chime

.......................30

Retractable Headlight Motor Warning Light .......................25

Switch.......................................30
Headlight High
Beam Indicator

Light ...........................................21

Head Restraints.................................8

Heating.............................................45

High Bea
m

Switch .......................................31
Indicator Light ...........................21

Hood Latch.....................................39
Identification Numbers.................127
Ignition
Keys.............................................3

Switch........................................58

Indicator Lights ...............................20
Inflation Pressures, Tire..............105
Instrument Panel....................19
Instrument Panel
Brightness

Control.......................................33

Interior light .....................................33
Interior Trim Care .........................110 Jack .............................................116
Jump Starting ...............................119ProCarManuals.comMain Menu t s

Keys
Door Locks ..................................3
Glove box ..................................39
Trunk Lid Lock ............................4
Ignition ........................................58

Key Reminder Beeper...............58Keys.............................................3
Lap/Shoulder Belts
................................Se
e "Seat Belts"

Light

Bulb Replacement...................103
Fuse Replacement ..................101
Light Reminder
Chime ..............30

Operation.................................30

Warning and Indicator Light
......................................................21
Locks

Fuel Filler Door ..........................56
Doors..........................................3

Glove Bo
x ..................................39

Trunk Lid......................................4

Anti-theft Steering

Column

Lock.......................................58

Lumbar Support,Driver's .................7
Maintenace Schedule
and

Records......................................76

Manual Transmission Maximum Allowable Speeds
....................................................66

Oil........................................86
Recommended Shift
Speeds

....................................................66

Shifting.....................................65

Meters Gauges.......See
"Gauges"
Mirrors Power Mirrors ...........................29
Rear View Mirrors ....................29 Numbers, Identification................ 127

Octane Rating,
Gasoline

.......................................... See "Fuel"
Odometer ........................................20Oil

Engine Oil ...................................83

Fluid Locations ..........................82Transmission Oil/Fluid ..............86Oil Pressure Warning Light.......22
Power Steering Fluid ................97
Operation In
Foreign Countries

..........................................................56

Panel Brightness Control ...............33
Parking Brake.................................
39

Power

Mirrors .......................................29
Steering .....................................
97

Windows................................40

PGM-FI System............................131
Pressures, Tire Inflation...............105
Preventive Service.......................

112
(cont'd)
Radiator Coolant .............................88

Radio ................................................47

Rear View Mirrors ..........................29
Rear Window Defogger ..................28
Reminder Lights
..........................See "Warning lights"ProCarManuals.comMain Menu t s