Subaru Legacy/Outback

1999-2003 of release

Repair and car operation

Subaru Legasi, Autbek
+ Cars Subaru Legacy, Outback
+ The operation manual
+ Routine maintenance
+ The engine
- Systems of cooling, heating
   - System of cooling of the engine
      Antifreeze - the general data
      Detachment and replacement of hoses of system of cooling
      Service of system of cooling (опорожнение, washing and refuelling)
      Details of installation and a principle of functioning of fans of system of cooling
      The water pump - the general information
      Check of serviceability of functioning and thermostat replacement
      Check of serviceability of functioning, removal, service and installation of fans of system of cooling
      Service, removal and installation of a radiator of system of cooling
      Check of a condition of a cover of a radiator
      Removal and installation of a broad tank
      Removal, check and installation of the water pump
   + Heating/ventilation/air conditioning systems
+ The power supply system and release
+ Engine electric equipment
+ Manual box and differential
+ Automatic transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Check of serviceability of functioning and thermostat replacement

Thermostat design

1 — the Valve
2 — the Spring
3 — the Emphasis
4 — the Piston
5 — Directing

6 — the Rubber holder
7 — the Lock ring
8 — Voskozapolnennyj an element
9 — the prorolling Valve

The basis of a design of the thermostat is made by the tight thermosensitive element filled with wax granules, which volume from varies with temperature change. Opening and closing of the working valve of the thermostat occurs strictly at certain values of temperature.



1. Before definitively to affirm as opinion on a thermostat exit out of operation, check up liquid level in cooling system, a condition and effort of a tension drive a belt (Routine maintenance see the Head), and also serviceability of functioning of a measuring instrument / a control lamp of temperature.
2. One of the possible reasons of not enough fast warming up of the engine (according to measuring instrument indications) is thermostat jamming in open position. Replace the thermostat new (see more low).
3. In case of an engine overheat touch a hand the bottom hose of a radiator. If the hose not нагрет, probably, the thermostat is jammed in the closed position and blocks circulation of a cooling liquid through a radiator. Replace the thermostat.

 At all do not maintain the car with the removed thermostat, - the feedback of the onboard processor that will lead to increase of toxicity of the fulfilled gases and excessive increase in the expense of fuel thus can be broken off!

4. If the bottom hose нагрет, it means that the cooling liquid regularly circulates through a radiator, i.e. the thermostat is opened, - address to materials of the Section devoted to diagnostics of malfunctions of system of cooling (Introduction in the beginning of the present Management see).
5. The most exact results are given by thermostat check on a workbench.
6. Remove the thermostat from the engine (see more low).

7. Tie up to assemblage of the thermostat a piece of a wire and lower it in the capacity filled with water, there lower the thermometer.

 Track, that the thermometer and the thermostat did not adjoin to walls and a capacity bottom.

1 — the Thermometer
2 — the Thermostat

8. Start to warm up slowly water, watching change of indications of the thermometer, - operation of the valve of the thermostat should occur in exact conformity to requirements of Specifications.

9. Estimate size of full opening of the valve, - the rating value makes 8 mm.



1. Disconnect a negative wire from the battery.
2. Remove protection картера.
3. Empty cooling system (Routine maintenance see the Head).
4. Disconnect from a thermostat cover радиаторный a hose.

5. Uncover the thermostat and a sealing lining, take the thermostat from a casing, - try to remember its adjusting position. Carefully smooth out sealing surfaces of a cover and a casing of the thermostat a scraper, then wipe their rags moistened in solvent.

6. Installation is made upside-down. Do not forget to replace a sealing lining, track, that the thermostat was established by the prorolling valve forward. The effort of a tightening of bolts of fastening of a cover makes 6.4 Nanometers.

7. In summary fill cooling system (Routine maintenance see the Head), start the engine and check up it on presence of signs of development of leaks. Make sure of serviceability of functioning of the thermostat.

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