Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1989 ac heater system auto

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                            A/C-HEATER SYSTEM - AUTOMATIC

                                      1988 Toyota Celica




         1988 Automatic A/C-Heater Systems

         Celica

    * PLEASE READ THIS FIRST *
CAUTION: When discharging air conditioning system, use only approved
         refrigerant recovery/recycling equipment. Make every attempt
         to avoid discharging refrigerant into the atmosphere.

    DESCRIPTION
         The automatic temperature control system consists of
electronically controlled A/C components that provided automatic
temperature control of vehicle's interior.

    OPERATION

    AMBIENT TEMPERATURE SENSOR
         Ambient sensor is a thermistor that determines temperature of
surrounding outside air and sends appropriate signals to amplifier.
This signal is compared against signals from in-car temperature
sensor.

    COOLANT TEMPERATURE SWITCH
         Switch senses coolant temperature at heater core. Information
is then sent to A/C amplifier to adjust amount of warm air that enters
vehicle's interior.

    SOLAR SENSOR
         Solar sensor functions as a monitor of sunlight. It senses
amount of sunlight entering vehicle interior, and then signals power
servo to adjust air temperature according to preselected temperature.

    TROUBLE SHOOTING

    NO BLOWER OPERATION
         Problem may be due to the following condition(s): blown
fuses, faulty heater relay, faulty blower motor or resistor, faulty
power transistor, faulty blower fan relay or blower switch, faulty A/C
control assembly, faulty wiring, bad ground, air vent mode control
servo, or system amplifier.

    NO COOL AIR
         Problem may be due to the following condition(s): blown
fuses, incorrect refrigerant charge, incorrect A/C compressor belt
tension, faulty magnetic clutch relay, faulty pressure switch or A/C
compressor, faulty A/C control assembly, faulty/plugged receiver-
drier, faulty/plugged condenser, faulty/plugged expansion valve or
evaporator, faulty thermistor or A/C amplifier, faulty wiring or bad
ground.
        NO WARM AIR
         Problem may be due to the following condition(s): A/C
control cable out of adjustment, faulty heater valve, faulty air mix
servomotor, faulty A/C amplifier or system amplifier (push-button
type), faulty wiring or bad ground.

        INTERMITTENT COOL AIR
         Problem may be caused by the following condition(s):
incorrect refrigerant charge, slipping A/C compressor belt, faulty
magnetic clutch, or plugged/faulty expansion valve or evaporator.

        COOL AIR ONLY AT HIGH SPEED
         Problem may be caused by the following condition(s):
incorrect refrigerant charge, slipping A/C compressor belt, faulty A/C
compressor, plugged condenser, or faulty A/C fan motor or fan relay.

        INSUFFICIENT COOLING
         Problem may be caused by the following condition(s):
incorrect refrigerant charge (including air or excessive oil in
system), slipping A/C compressor belt, out-of-adjustment A/C control
cable, clogged condenser, faulty A/C compressor, faulty A/C fan or
relay, faulty expansion valve, faulty A/C control assembly, faulty air
mix servomotor, faulty wire harness connections or wiring.

        NO BLOWER CONTROL
         Problem may be due to the following condition(s): power
transistor faulty, blower resistor, heater main relay or blower fan
relay faulty, faulty A/C control assembly,blown fuses, faulty wire
harness connections or wiring.

        INSUFFICIENT COOL AIR VELOCITY
         Problem may be caused by the following condition(s): faulty
blower motor, blocked air inlet, clogged/frosted evaporator, or air
leakage from evaporator case or air duct.

        TESTING

        A/C AMPLIFIER
         Disconnect amplifier. Check continuity or battery voltage on
wiring harness connector following test conditions specified in A/C
AMPLIFIER TEST chart. See Fig. 1. If circuit resistance/voltage
readings are correct, replace A/C amplifier.

A/C AMPLIFIER TEST TABLE
 

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