Toyota Corolla

1992-1998 of release

Repair and car operation

Toyota Corolla
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
- 4. Systems of cooling, heating
   4.1. Specifications
   4.2. Antifreeze
   4.3. Thermostat
   4.4. Fan and relay of turning on of the fan
   4.5. Radiator and broad tank
   4.6. The pump of cooling liquid
   4.7. The sensor of temperature of cooling liquid
   4.8. Fan block
   4.9. Heater radiator
   - 4.10. Control panel heater and conditioner
      4.10.1. Central air
   4.11. Vlagootodelitel of the conditioner
   4.12. Compressor
   4.13. Condenser
   4.14. Evaporator and broad valve
+ 5. Fuel, exhaust systems
+ 6. System of decrease in toxicity
+ 7. Transmissions
+ 8. Coupling and semi-axes
+ 9. Brake system
+ 10. Suspension bracket and steering
+ 11. Body
+ 12. Electric equipment

4.10.1. Central air



The highway of central air is under a high pressure. Before complete removal of a coolant it is forbidden to disconnect any hoses and to remove central air units. Removal of a coolant should be carried out only in service of car-care center of the dealer or in a specialized workshop. Even after coolant removal from the highway of the conditioner to disconnect hoses it is possible only after putting on of goggles.

Central air device

1. Compressor, electromagnetic coupling, temperature switch of the compressor
2. Condenser
3. Condenser electrofan
4. Receiver (moisture separator)
5. Relay
6. heater, heater radiator
7. Cooling block, broad valve, evaporator, block of resistors, thermoresistor
8. Fan block, electric motor of the block of the fan

Below the list of procedures on the care of central air, providing maintenance of its normal work for an appreciable length of time is provided.

1. Check a condition of a belt of a drive of the compressor of the conditioner. At detection of signs of wear or damages replace a belt (see subsection 2.6.4).
2. Check a belt tension, if necessary adjust (see subsection 2.6.4).
3. Check a condition of hoses of the conditioner, existence on them of cracks, swellings, hardenings, and mechanical damages, swelling from oil and stratification hit. Check reliability of joints. At detection of a podtekaniye, obvious signs of damages hoses replace.
4. Examine condenser edges, remove from intercostal intervals the remains of leaves, insects and other extraneous subjects. For this purpose blow the condenser the compressed air, or clear a special comb.

It is recommended not less often than once a month to turn on the conditioner not less than for ten minutes. Especially it is necessary to do it in the winter when because of long idle time there is a hardening of epiploons and sealants and the subsequent their destruction.

Leaks in central air are best of all shown at pressure and temperature increase to an operating level. For leak identification in system start the engine for five minutes at the switched-on conditioner. Stop the engine and examine hoses and conditioner joints. Oily smudges will indicate a coolant podtekaniye.

Because of complexity of central air and also because for diagnostics of system use of the special equipment is necessary, any works on service and check should be carried out by specially pogotovlenny personnel.

If the conditioner does not work in general, check the panel of safety locks (see subsection 12.1) and relay of the conditioner which are located in the assembly block in a motor compartment.

The most widespread reason of unsatisfactory operation of the conditioner is insufficient filling of a coolant. If appreciable temperature increase of air from the conditioner is observed, check completeness of filling of a coolant in the way described below.

Check of filling of a coolant

1. Warm up the engine to normal working temperature.
2. Transfer a rychazhok of a regulator of air temperature to the situation corresponding to the lowest temperature, establish the highest speed of rotation of the fan. Open doors (to exclude automatic conditioner shutdowns after salon cooling).
3. Check turning on of the compressor. At turning on of the compressor click of the electromagnetic coupling is distributed, and the central part of the coupling starts to rotate. After the temperature of system will reach an operating level, compare наощупь temperature of two tubes of the evaporator on a partition of a motor compartment. The final tube of the evaporator (bigger diameter) should be a little warmer, than inlet (smaller diameter).
4. The tube conducting from the condenser to the evaporator (a tube of smaller diameter) should be cold, and the tube from the evaporator to the compressor should be a little colder (approximately on 2–6 ° C). If the final tube of the evaporator is much warmer than inlet, filling by a coolant the insufficient.
5. On the working conditioner bring the thermometer to the central part of the channel of an air outlet. Air temperature on an exit from the channel should be on 17-20 ° From below ambient temperature (and does not exceed 20 ° C). If the air temperature very high, for example 45 ° With, air temperature on an exit from the conditioner can reach 15 ° With, though as a rule temperature of the cooled air on 17-20 ° From below ambient temperature. If the temperature of the cooled air is higher than standard, conditioner refueling by a coolant is necessary. Further works with the conditioner are beyond this management and should be carried out by the prepared personnel.
6. Check a coolant condition through viewing glass. Viewing glass is in the top part of a receiver (it is specified by an arrow). If at the working conditioner in glass foaming is observed, the quantity of a coolant is not enough.
7. At high temperature of environment in viewing glass bubbles, even can be observed at normal filling of a coolant. When the conditioner is switched off and the quantity of a coolant in norm in viewing glass is observed small foaming which disappears subsequently.
8. If checks show that filling of a coolant is insufficient, it is necessary to hand over the car in service of car-care center of the dealer or in a specialized workshop for coolant refilling.


If the heating of air in a heater is absent, the following can be the reasons: or the thermostat is not closed, therefore liquid is warmed up insufficiently and badly warms up a heater radiator (in this case replace the thermostat (see subsection 4.3)), or the heater hose that interferes with a liquid stream through a radiator is littered. In this case carry out hose washing:

1. Check наощупь temperature of hoses on a partition of a motor compartment. Hoses should be hot. If one of hoses cold, indicates it blocking of a hose or a heater radiator, or that the control valve is closed.
2. Disconnect hoses and wash out a radiator a water stream from a hose. If water freely proceeds through a radiator, remove both hoses and wash out them a water stream.
3. If water does not pass through a heater radiator, the radiator is littered and is subject to replacement (see subsection 4.5).

If speed of rotation of the fan does not correspond to position of the switch, it is necessary to check safety locks, conducting, the switch, the block of resistors or the electric motor (see subsection 3.3.14).

If from exhaust outlets of air lines air does not arrive, arrive as follows:
1. Turn the ignition key in the situation ON and turn on the fan. Having put an ear to an air line exit, listen. Noise of the working electric motor should be listened.
2. If the rumble of the electric motor is not listened, or if check shows that the switch and the block of resistors are serviceable, malfunction of the electric motor (see subsection 3.3.14) can be the reason.

If the rug is humidified, or through ventilating openings pairs of cooling liquid get, in a radiator of a heater there is a leak. Replace a radiator (see subsection 4.5) as the heater radiator in repair as a rule is not accepted.

Check lack of a contamination of a drain hose of the heater / conditioner which is on the right side on a partition of a motor compartment.