Toyota Corolla

1992-1998 of release

Repair and operation of the car

Toyota Corolla
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
- 4. Cooling systems, 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. Pump of cooling liquid
   4.7. Sensor of temperature of cooling liquid
   4.8. Fan block
   4.9. Heater radiator
   - 4.10. Control panel of a heater and conditioner
      4.10.1. Air conditioning system
   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 half shafts
+ 9. Brake system
+ 10. Suspension bracket and steering
+ 11. Body
+ 12. Electric equipment


4.10.1. Air conditioning system



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

Air conditioning system device

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

The list of the procedures for care of air conditioning system providing maintenance of its normal work for an appreciable length of time is given below.

1. Check a condition of a belt of the 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 hit of oil and stratification. Check reliability of joints. At detection of dribble, strong indications of damages replace hoses.
4. Examine condenser edges, remove the remains of leaves, insects and other foreign objects from intercostal intervals. For this purpose blow the condenser compressed air, or clear a special comb.

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

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

Because of complexity of air conditioning system and also because diagnostics of system requires use of the special equipment, any works on service and check have to be carried out by specially pogotovlenny personnel.

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

Insufficient gas station of coolant is the most common cause of unsatisfactory operation of the conditioner. If noticeable temperature increase of air from the conditioner is observed, then check completeness of filling of coolant with the way described below.

Check of gas station of coolant

1. Warm up the engine up to the normal working temperature.
2. Transfer an air temperature regulator rychazhok to the situation corresponding to the lowest temperature, establish the highest speed of rotation of the fan. Open doors (to exclude automatic shutdowns of the conditioner after cooling of salon).
3. Check turning on of the compressor. At turning on of the compressor the click of the electromagnetic coupling sounds, and the central part of the coupling begins to rotate. After temperature of system reaches 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) has to be a little warmer, than inlet (smaller diameter).
4. The tube, the leader from the condenser to the evaporator (a tube of smaller diameter) has to be cold, and the tube from the evaporator to the compressor has to be a little colder (approximately on 2–6 °C). If the final tube of the evaporator is much warmer than inlet, then filling with coolant insufficient.
5. On the working conditioner bring the thermometer to the central part of the canal of an air outlet. Air temperature at the exit from the channel has to be 17-20 °C lower than ambient temperature (and does not exceed 20 °C). If air temperature very high, for example 45 °C, then air temperature at the exit from the conditioner can reach 15 °C though as a rule temperature of the cooled air is 17-20 °C lower than ambient temperature. If temperature of the cooled air is higher than standard, then refueling of the conditioner coolant is necessary. Further works with the conditioner are beyond this manual and have to be carried out by the prepared personnel.
6. Check a condition of coolant 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, then the amount of coolant is not enough.
7. At high temperature of the environment in viewing glass bubbles, even can be observed during normal filling of coolant. When the conditioner is switched off and the amount of coolant normal in viewing glass is observed small foaming which disappears subsequently.
8. If checks show that gas station of coolant is insufficient, then the car should be handed over in service of car service of the dealer or in a specialized workshop for coolant refilling.


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

1. Check наощупь temperature of hoses on a partition of a motor compartment. Hoses have to be hot. If one of hoses cold, then indicates it blocking of a hose or radiator of a heater, 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, then remove both hoses and wash out their stream waters.
3. If water does not pass through a heater radiator, then the radiator is littered and is subject to replacement (see subsection 4.5).

If the speed of rotation of the fan does not correspond to position of the switch, then 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 ducts air does not arrive, then arrive as follows:
1. Turn the ignition key in position of ON and turn on the fan. Having put an ear to an air duct exit, listen. Noise of the working electric motor has to 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, then malfunction of the electric motor can be the cause (see subsection 3.3.14).

If the rug is moistened, or through air vents vapors of cooling liquid get, then 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.