Heating and air conditioning car Toyota Corona 9 (T190)

Air conditioning system — general information
General appearance: 1 - compressor, 2 - relay block #2: heater fan relay #1, radiator fan relay #2, air conditioner electromagnetic clutch relay, 3 - relay block #1: heater main relay, 4 - radiator, 5 - radiator fan, 6...

Installing and removing the pressure gauge block
Installation 1. Attach the charging hoses to the gauge block. Tighten the nuts by hand. 2. Install quick-release adapters on the hoses. 3. Close both valves of the pressure gauge block. 4. Remove the plugs from the...

Evacuation and charging of the air conditioning system
1. Install the pressure gauge block. 2. Evacuate the system. a) Install the adapter on the vacuum pump. b) Connect the central hose of the pressure gauge block to the vacuum pump adapter. c) Open both valves of the...

Checking the air conditioning system using a pressure gauge block
1. Connect the pressure gauge block. 2. Read pressure gauge readings under the following conditions. a) Air intake control switch in the "RECIRC" position (air temperature in the air intake is 30-35°C). b) The engine...

Checking the amount of refrigerant
1. Set the temperature control to maximum cooling mode. 2. Set the fan speed to maximum ("HI") 3. Set the air flow mixing flap to the "RECIRC" position (recirculation). 4. Turn on the air conditioner. 5. Open all doors....

Checking the air conditioning compressor drive belt
1. Check the condition of the belt and the correct installation of the belt in the pulley grooves. 2. Check the belt tension Press the belt at the location shown in the figure with a force of 98 N (10 kgf) and measure...

Checking the idle speed increase system
1. Start and warm up the engine. 2. Set the following modes: a) The electrical load is disconnected. b) Heater fan speed controller in the "HI" position. c) The air conditioner is on. d) Temperature regulator in the...

Cooling Lines — Checking and Replacing
Check on the car 1. Check the tightness of the pipeline connections. 2. Use a leak detector to check the system for leaks. Replacement of pipeline elements 1. Remove the refrigerant from the system. 2 Replace faulty...

Air Conditioning Compressor — Check
Checking the electromagnetic clutch on a car 1. Visual inspection. a) Check that there are no traces of oil on the pressure plate and rotor. b) Check for noise and grease leaks at the clutch bearings. 2. Check for...

Expansion Valve — Checking on Vehicle
1. Check the amount of refrigerant. 2. Install the pressure gauge block. 3. Start the engine. 4. Set the idle speed to 1500 rpm and let the engine run for approximately 5 minutes. 6. Check that the high pressure gauge...

Heater Fan — Removal, Installation and Checking
Removal and installation Disconnect the connector, unscrew the 3 screws and remove the electric motor. Examination Connect the positive battery terminal to terminal 1 of the connector and the negative terminal to...

Air intake flap servo drive
Removal The drive is located in the heater unit. Examination 1. Connect the battery to terminals "7" (+) and "3" (-) of the connector. Check that the flap moves to the "FRESH" position (ventilation). 2. Connect the...

Air flow mixing flap servo drive
Removal 1. Remove the glove compartment door. 2. Remove the servo. a) Disconnect the connector. b) Unscrew the two screws and remove the drive. Examination 1. Check the operation of the servo drive. a) Connect the...

Air flow direction flap servo drive
Removal 1. Remove the lower trim panel. 2. Remove the servo. Examination 1. Connect the battery to terminals "6" (+) and "7" (-) of the connector. 2. Connect each connector lead to the negative battery terminal and...

Heater Fan Resistor
Removal Disconnect the connector and remove the heater blower resistor. Examination Check for continuity between all connector terminals.

Ambient air temperature sensor
1. Disconnect the sensor connector. 2. Measure the resistance between the connector terminals. The resistance should be within 1625-1785 Ohm at 25°C.

Interior temperature sensor
Removal 1. Remove the lower trim panel mounting bolts. 2. Disconnect the connector. 3. Release the sensor latch and remove it. Examination Measure the resistance between the connector terminals. The resistance should be...

Sunlight sensor
Removal Using a screwdriver, carefully remove the sensor and disconnect the connector. Examination 1. Cover the sensor from light and check that there is no conductivity between the terminals. 2. Direct a bright light...

Evaporator temperature sensor
Examination By car Measure the resistance between the connector terminals. Nominal resistance is 1500 ohms at 25°C. Removed sensor Place the sensor in cold water with ice. Measure the resistance between the terminals...

Compressor Operation Sensor (3S-FE Models Only)
Check on the car Measure the resistance between terminals "1" and "2". Nominal resistance is 100-130 Ohm at 20°C.

Pressure switch
Examination 1. Install the pressure gauge block. 2. Disconnect the connector from the pressure switch. 3. Set the engine speed to approximately 1500 rpm. 4. Check the operation of the switch. Electromagnetic clutch...

Heater and Fan Relay
Examination 1. Checking the heater relay. a) Check for constant conductivity between terminals "1" and "3". b) Check for constant conductivity between terminals "2" and "4". c) Check for conductivity only between...

Air conditioning control unit
Examination 1. Check the backlight operation: a) Connect the battery to terminals "A9" (+) and "A20" (-). Check that the backlight lamp lights up. If the lamp does not light up, perform the following checks. b)...

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Corona T190 (1992-1997)