Mazda 626

1991-1998 of release

Repair and operation of the car

Mazda 626

+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
- 4. Heating and ventilation
   4.1. Introduction
   4.2. Technical characteristics
   4.3. Thermostat
   4.4. The cooling fans
   4.5. Radiator and broad tank
   4.6. Water pump
   4.7. Sensor of temperature of cooling liquid
   4.8. Oil heater of the engine (6-cylinder models)
   4.9. Electric chain of the motor of the delivery fan
   4.10. Motor of the delivery fan
   4.11. Control unit of a heater and air conditioner
   4.12. Heater radiator
   - 4.13. Systems of air conditioning and heating
      4.13.1. Electric chain of coupling of the compressor of the air conditioner
      4.13.2. Moisture separator of the air conditioning system
      4.13.3. Compressor of the air conditioner
      4.13.4. Refrigerator of the air conditioning system
      4.13.5. Evaporator of the air conditioning system
      4.13.6. Broad nozzle of the air conditioning system
+ 5. Fuel system
+ 6. Exhaust system
+ 7. Transmissions
+ 8. Coupling and half shafts
+ 9. Brake system
+ 10. Running gear
+ 11. Body
+ 12. Electric equipment
+ 13. Electrical circuitries
+ 14. Useful tips


4.13. Systems of air conditioning and heating


Within maintenance it is necessary to carry out the following inspections regularly:

Check a condition of a driving compressor belt. If necessary replace a belt.

Check a tension of a belt and if necessary adjust it.

Examine system hoses on existence of cracks, swellings, and the ground places. If necessary replace hoses.

Examine edges of the refrigerator and clean the dirt which got stuck in them.

Check coolant pressure.

1. Warm the engine up to the working temperature.
2. Install the handle of adjustment of temperature in the provision of cold air. Include the maximum speed of the delivery fan.
3. After air conditioning system reaches working temperature, touch two tubes connected to the refrigerator.
4. Thinner tube has to be cold, and thicker tube has to be even colder (about -16 °C or -12 °C).
5. If the thick tube is much warmer, than thin, the system should be loaded with coolant in addition. Insert the thermometer into the center of an air vent. Air temperature, arriving from an opening has to be 20-25 °C lower than temperature of air. If it not so, system it is necessary to load in addition with coolant, for this purpose address the expert.


Set for recharge of air conditioning system coolant

Any motorist can conduct recharge of air conditioning systems of later models in which R-134a coolant is used independently. For this purpose it is necessary to acquire special set for recharge.

For recharge of the air conditioning system coolant, uses two types of R-12 coolant and R-134a. The systems loaded with R-12 coolant are used mainly on early models (1993). Maintenance of these systems needs to be carried out in specialized workshops.

1. Connect a hose to the valve located on a tube of coolant or on a moisture separator.
2. Close contacts (are specified by an arrow) pressure switch by means of a crossing point that the compressor continued to work when you load system with coolant.



1. Take air temperature, arriving from an air vent.
2. Examine a hose of the block of a heater and the evaporator, check that it was not littered.

If the air arriving from air vents not hot, a problem can consist in the following:

a) Jammed the thermostat in open situation. Replace the thermostat.

b) The heater radiator hose is littered. Wash out hoses of a radiator and a radiator.

c) The heater radiator is littered. If it is not possible to wash out a radiator, replace it.

If the delivery fan works not in all modes, see subsection 4.9.

If air does not arrive from air vents:

a) Include ignition and the delivery fan. Listen whether the fan motor works.

b) If the motor does not work, replace it.

If from air vents steam or a smell of antifreeze arrives, so the radiator of a heater which needs to be replaced proceeds.


For removal of the smells arising in the air conditioning system usually use special disinfectants. And, though, the best decision would be to address in a specialized workshop, you can process air conditioning system elements.

Remove the resistor of the delivery fan and process disinfecting structure the evaporator.

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