Subaru Forester

1997-2005 of release

Repair and operation of the car

Subaru Forester
+ Subaru Forester cars
+ Maintenance instruction
+ Routine maintenance
+ Engine
- Cooling systems, heating
   Specifications
   Antifreeze - general information
   Check of serviceability of functioning and replacement of the thermostat
   Removal and installation of the fan of the cooling system
   Service, removal and installation of a radiator of the cooling system
   Removal and installation of a filling tank (model with a turbo-supercharging)
   Removal, check and installation of the water pump
   System of heating and ventilation of salon - the general information
   Removal and installation of a heater
   Removal and installation of the fan of a heater
   Check of serviceability of functioning and service of systems of heating and air conditioning
+ Power supply system and release
+ Engine electric equipment
+ Control systems of the engine
+ Gear shifting box
+ Coupling, transmission line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Check of serviceability of functioning and replacement of the thermostat

Do not open a cover of a radiator and do not remove the thermostat before full cooling of the engine! See also prevention at the beginning of the Section Antifreeze - general information).

Check

PERFORMANCE ORDER

1. Before finally being approved in opinion on a thermostat exit out of operation, check the level of cooling liquid in system, a state and effort of a tension of a driving belt (see the Head Routine maintenance) and also serviceability of functioning of the measuring instrument / a control lamp of temperature.
2. One of the possible reasons of too slow warming up of the engine (according to indications of the measuring instrument) is jamming of the thermostat in open situation. Replace the thermostat new.
3. In case of an overheat of the engine touch the lower hose of a radiator. If the hose is not heated, perhaps, the thermostat is jammed in a closed position and blocks circulation of cooling liquid through a radiator. Replace the thermostat.

Do not operate the car with the removed thermostat at all, - at the same time feedback of the onboard processor can be broken that will lead to increase in toxicity of the fulfilled gases and excessive increase in fuel consumption.

4. If the lower hose is heated, it means that cooling liquid regularly circulates through a radiator, i.e. the thermostat is open. Address materials of the Section devoted to diagnostics of malfunctions of the cooling system (see Introduction at the beginning of the present manual).
5. The most exact results are yielded by check of the thermostat on a workbench.
6. Remove the thermostat from the engine (see below).
7. Tie up a piece of a wire to assembly of the thermostat 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 bottom of capacity.

8. Begin to warm up slowly water, monitoring change of indications of the thermometer, - operation of the valve of the thermostat has to happen in strict accordance with requirements of Specifications).

9. Estimate the size of full opening of the valve, - the nominal rate makes 8 mm.

Replacement

Thermostat design


1 — the Working valve 2 — Pruzhina 3 — the Emphasis 4 — the Piston 5 — the Guide 6 — the Rubber holder 7 — the Lock ring 8 — the Thermosensitive element 9 — the pumping Valve

PERFORMANCE ORDER

1. Disconnect a negative wire from the battery.

If the stereosystem established on the car is equipped with a security code before disconnecting the battery make sure that you have the correct combination for input of the audio system in action!

2. Merge cooling liquid (see the Head Routine maintenance).
3. At the corresponding complete set disconnect vacuum hoses from a thermostat casing.
4. Uncover a thermostat casing.
5. Take the thermostat from a casing, - try to remember its adjusting situation. Carefully smooth out sealing surfaces of a cover and a casing of the thermostat a scraper, then wipe with their rags moistened in solvent.
6. Install the thermostat on the regular place by the pumping valve forward and up.
7. Tighten all fixture with the required effort. Working as it should be the return to a dismantle order, install into place all being removed components.
8. Fill the cooling system (see the Head Routine maintenance). Start the engine and check it for existence of leaks and serviceability of functioning of the thermostat.