Mazda 626

1991-1998 of release

Repair and car operation

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. Cooling fans
   4.5. Radiator and broad tank
   4.6. Water pump
   4.7. The sensor of temperature of cooling liquid
   4.8. Oil radiator 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 heater and air conditioner
   4.12. Heater radiator
   + 4.13. Systems of air conditioning and heating
+ 5. Fuel system
+ 6. Exhaust system
+ 7. Transmissions
+ 8. Coupling and semi-axes
+ 9. Brake system
+ 10. Running gear
+ 11. Body
+ 12. Electric equipment
+ 13. Electroschemes
+ 14. Good advice

4.3. Thermostat



The engine should cool down completely.


1. Measure level of cooling liquid, check a tension of a driving belt and functioning of the temperature sensor.
2. If the engine is warmed up too long, most likely, that jammed the thermostat in open situation. Replace the thermostat.
3. If the engine overheats, check temperature of the top hose of a radiator if the hose not hot, means, the thermostat jammed in a closed position. Replace the thermostat.
4. For carrying out more careful check the thermostat is necessary for removing from the engine.
5. If the thermostat is not closed at room temperature, means, it is faulty and is subject to replacement.
6. Lower the thermostat in capacity with cold water (the thermostat is closed).
7. Warm up water in capacity and watch its temperature. The thermostat should not concern walls and a capacity bottom.
8. Write down thermometer indications when the thermostat only starts to open and when it is completely open. Compare the received sizes to technical requirements.
9. Replace the thermostat if it does not open or it is not closed or it jams in any situation.


1. Disconnect a wire of the minus plug of the accumulator.
2. Merge cooling liquid from a radiator. In six-cylinder engines remove an airintaking branch pipe.
3. Disconnect a hose of a radiator (And) and unscrew bolts from a thermostat cover (In) – 4-cylinder models.
4. Unscrew a bolt (In) tubes of cooling liquid. Disconnect a tube from a cover of the thermostat and unscrew bolts of a cover (And) – 6-cylinder models.
5. Uncover the thermostat.
6. Remove the thermostat.
7. Clean being joined surfaces and establish new laying.
8. Installation is carried out upside-down removals.