Cooling System (h4so) Subaru Impreza WRX GD/GG рестайлинг 2

SPECIFICATION

COOLING SYSTEM SPECIFICATION CHART

Identifying Water Pump Components. Scheme 16

Identifying Radiator And Radiator Fan Components. Scheme 17

CAUTION

1. Wear work clothing, including a cap, protective goggles, and protective shoes during operation.
2. Remove contamination including dirt and corrosion before removal, installation or disassembly.
3. Keep the disassembled parts in order and protect them from dust and dirt.
4. Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, installation, disassembly and replacement.
5. Be careful not to burn your hands, because each part in the vehicle is hot after running.
6. Be sure to tighten fasteners including bolts and nuts to the specified torque.
7. Place shop jacks or rigid racks at the specified points.
8. Before disconnecting electrical connectors of sensors or units, be sure to disconnect the ground cable from battery.

SPECIAL TOOL

SPECIAL TOOL CHART ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS 499977100 CRANK PULLEY WRENCH Used for stopping rotation of crank pulley when loosening and tightening crankshaft pulley bolt. 18231AA010 CAM SPROCKET WRENCH Used for removing and installing cam sprocket. Also the CAM SPROCKET WRENCH (499207100) can be used

Scheme 18

Scheme 19

Scheme 20

INSPECTION

DETECTING CONDITION

1. Engine coolant temperature is above 96°C (205°F).
2. A/C compressor is rotated.
3. Vehicle speed is below 19 km/h (12 MPH).

TROUBLE SYMPTOM

1. Radiator main fan does not rotate under the above conditions.
2. Radiator main fan does not rotate at high speed when the following conditions are both met: Engine coolant temperature is above 90°C (194°F). A/C is ON. DIAGNOSIS PROCEDURE CHART Step Check Yes No 1 CHECK OPERATION OF RADIATOR. Run the engine at idle. (Vehicle stationary) Turn the A/C switch to OFF. Warm the engine coolant temperature over 96°C (205°F). Does the main radiator fan rotate? Go to step 2. Go to step 3. 2 CHECK OPERATION OF RADIATOR. Turn the A/C switch to ON at condition of step 1. Does the main radiator fan rotate faster when A/C compressor is operated? Radiator main fan system is okay. Go to step 17. 3 CHECK POWER SUPPLY TO MAIN FAN MOTOR. CAUTION: Be careful not to overheat the engine during repair. Turn the ignition switch to OFF. Disconnect the connector from main fan motor. Start the engine, and warm it up until engine coolant temperature increases over 96°C (205°F). Stop the engine and turn ignition switch to ON. Measure the voltage between main fan motor connector and chassis ground. Connector & terminal (F17) No. 1 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 4. Go to step 7. 4 CHECK GROUND CIRCUIT OF MAIN FAN MOTOR. Turn the ignition switch to OFF. Measure the resistance between main fan motor connector and chassis ground. Connector & terminal (F17) No. 3 - Chassis ground: (F17) No. 4 - Chassis ground: Is the resistance less than 5 ohms? Go to step 5. Repair the open circuit in harness between main fan motor connector and chassis ground. 5 CHECK POOR CONTACT. Check poor contact in main fan motor connector. Is there poor contact in main fan motor connector? Repair the poor contact in main fan motor connector. Go to step 6. 6 CHECK MAIN FAN MOTOR. Connect the battery positive (+) terminal to terminal No. 1, and ground (-) terminal to terminal No. 3 or No. 4 of main fan motor connector. Does the main fan rotate? Repair the poor contact in main fan motor connector. Replace the main fan motor with a new one. 7 CHECK POWER SUPPLY TO MAIN FAN RELAY 1. Turn the ignition switch to OFF. Remove the main fan relay 1 from A/C relay holder. Measure the voltage between main fan relay 1 terminal and chassis ground. Connector & terminal (F27) No. 31 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 8. Go to step 9. 8 CHECK POWER SUPPLY TO MAIN FAN RELAY 1. Turn the ignition switch to ON. Measure the voltage between main fan relay 1 terminal and chassis ground. Connector & terminal (F27) No. 34 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 12. Go to step 11. 9 CHECK 20 A FUSE. Remove the 20 A fuse from A/C relay holder. Check the condition of fuse. Is the fuse blown out? Replace the fuse. Go to step 10. 10 CHECK POWER SUPPLY TO A/C RELAY HOLDER 20 A FUSE TERMINAL. Measure the voltage of harness between A/C relay holder 20 A fuse terminal and chassis ground. Connector & terminal (F27) No. 1 (+) - Chassis ground (-): Is the voltage more than 10 V? Repair the open circuit in harness between 20 A fuse and main fan relay terminal. Repair the open circuit in harness between main fuse box connector and 20 A fuse terminal. 11 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse No. 18 from joint box. Check the condition of fuse. Is the fuse blown out? Replace the fuse. Repair the open circuit in harness between main fan relay and ignition switch. 12 CHECK MAIN FAN RELAY. Turn the ignition switch to OFF. Remove the main fan relay 1. Measure the resistance of main fan relay 1. Terminals No. 30 - No. 31: Is the resistance more than 1 Mohms? Go to step 13. Replace the main fan relay. 13 CHECK MAIN FAN RELAY. Connect the battery to terminals No. 34 and No. 32 of main fan relay 1. Measure the resistance of main fan relay 1. Terminals No. 30 - No. 31: Is the resistance less than 1 ohms? Go to step 14. Replace the main fan relay. 14 CHECK HARNESS BETWEEN MAIN FAN RELAY TERMINAL AND MAIN FAN MOTOR CONNECTOR. Measure the resistance of harness between main fan motor connector and main fan relay terminal. Connector & terminal (F17) No. 1 - (F27) No. 30: Is the resistance less than 1 ohms? Go to step 15. Repair the open circuit in harness between main fan motor connector and main fan relay terminal. 15 CHECK HARNESS BETWEEN MAIN FAN RELAY AND ECM. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance of harness between main fan relay connector and ECM connector. Connector & terminal (F27) No. 32 - (B136) No. 18: Is the resistance less than 1 ohms? Go to step 16. Repair the open circuit in harness between main fan relay and ECM. 16 CHECK POOR CONTACT. Check poor contact in connector between main fan and ECM. Is there poor contact in connector between main fan motor and ECM? Repair the poor contact connector. Record the DTC. Repair the trouble cause. < Ref. to «READ DIAGNOSTIC TROUBLE CODE (DTC)»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/testing-diagnostics/#engine-controls-engine-diagnostics-h4so) . > 17 CHECK POWER SUPPLY TO MAIN FAN MOTOR. CAUTION: Be careful not to overheat the engine during repair. Turn the ignition switch to OFF. Disconnect the connector from main fan motor. Start the engine, and warm it up until engine coolant temperature increases over 96°C (205°F). Turn the A/C switch ON. Measure the voltage while A/C compressor is rotating. Measure the voltage between main fan motor connector and chassis ground. Connector & terminal (F17) No. 2 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 18. Go to step 20. 18 CHECK POOR CONTACT. Check poor contact in main fan motor connector. Is there poor contact in main fan motor connector? Repair the poor contact in main fan motor connector. Go to step 19. 19 CHECK MAIN FAN MOTOR. Connect the battery positive (+) terminal to terminal No. 2, and ground (-) terminal to terminal No. 3 or No. 4 of main fan motor connector. Does the main fan rotate? Repair the poor contact in main fan motor connector. Replace the main fan motor with a new one. 20 CHECK POWER SUPPLY TO MAIN FAN RELAY2. Turn the ignition switch to OFF. Remove the main fan relay2 from A/C relay holder. Measure the voltage between main fan relay2 terminal and chassis ground. Connector & terminal (F27) No. 28 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 21. Go to step 22. 21 CHECK POWER SUPPLY TO MAIN FAN RELAY2. Turn the ignition switch to ON. Measure the voltage between main fan relay2 terminal and chassis ground. Connector & terminal (F27) No. 25 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 25. Go to step 24. 22 CHECK 20 A FUSE. Remove the 20 A fuse from A/C relay holder. Check the condition of fuse. Is the fuse blown out? Replace the fuse. Go to step 23. 23 CHECK POWER SUPPLY TO A/C RELAY HOLDER 20 A FUSE TERMINAL. Measure the voltage of harness between A/C relay holder 20 A fuse terminal and chassis ground. Connector & terminal (F27) No. 1 (+) - Chassis ground (-): Is the voltage more than 10 V? Repair the open circuit in harness between 20 A fuse and main fan relay terminal. Repair the open circuit in harness between main fuse box connector and 20 A fuse terminal. 24 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse No. 18 from joint box. Check the condition of fuse. Is the fuse blown out? Replace the fuse. Repair the open circuit in harness between main fan relay and ignition switch. 25 CHECK MAIN FAN RELAY. Turn the ignition switch to OFF. Remove the main fan relay2. Measure the resistance of main fan relay2. Terminals No. 28-No. 29: Is the resistance more than 1 Ma? Go to step 26. Replace the main fan relay. 26 CHECK MAIN FAN RELAY. Connect the battery to terminals No. 25 and No. 27 of main fan relay2. Measure the resistance of main fan relay2. Terminals No. 28 - No. 29: Is the resistance less than 1 ohms? Go to step 27. Replace the main fan relay. 27 CHECK HARNESS BETWEEN MAIN FAN RELAY TERMINAL AND MAIN FAN MOTOR CONNECTOR. Measure the resistance of harness between main fan motor connector and main fan relay terminal. Connector & terminal (F17) No, 2 - (F27) No. 29: Is the resistance less than 1 ohms? Go to step 28. Repair the open circuit in harness between main fan motor connector and main fan relay terminal. 28 CHECK HARNESS BETWEEN MAIN FAN RELAY AND ECM. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance of harness between main fan relay connector and ECM connector. Connector & terminal (F27) No. 27- (B136) No. 29: Is the resistance less than 1 ohms? Go to step 29. Repair the open circuit in harness between main fan relay and ECM. 29 CHECK POOR CONTACT Check poor contact in connector between main fan and ECM. Is there poor contact in connector between main fan motor and ECM? Repair the poor contact connector. Record the DTC. Repair the trouble cause. < Ref. to «READ DIAGNOSTIC TROUBLE CODE (DTC)»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/testing-diagnostics/#engine-controls-engine-diagnostics-h4so) . >

DETECTING CONDITION

1. Engine coolant temperature is above 96°C (205°F).
2. A/C compressor is rotated.
3. Vehicle speed is below 19 km/h (12 MPH).

TROUBLE SYMPTOM

1. Radiator sub fan does not rotate under the above conditions.
2. Radiator sub fan does not rotate at high speed when the following conditions are both met: Engine coolant temperature is above 90°C (194°F). A/C is ON. DIAGNOSIS PROCEDURE CHART Step Check Yes No 1 CHECK OPERATION OF RADIATOR. Run the engine at idle. (Vehicle stationary) Turn the A/C switch to OFF. Warm the engine coolant temperature over 96°C (205°F). Does the radiator sub fan rotate? Go to step 2. Go to step 3. 2 CHECK OPERATION OF RADIATOR. Turn the A/C switch to ON at condition of step 1. Does the radiator sub fan rotate faster when A/C compressor is operated? Radiator main fan system is okay. Go to step 17. 3 CHECK POWER SUPPLY TO SUB FAN MOTOR. CAUTION: Be careful not to overheat the engine during repair. Turn the ignition switch to OFF. Disconnect the connector from sub fan motor. Start the engine, and warm it up until engine coolant temperature increases over 96°C (205°F). Stop the engine and turn ignition switch to ON. Measure the voltage between sub fan motor connector and chassis ground. Connector & terminal (F16) No. 1 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 4. Go to step 7. 4 CHECK GROUND CIRCUIT OF SUB FAN MOTOR. Turn the ignition switch to OFF. Measure the resistance between sub fan motor connector and chassis ground. Connector & terminal (F16) No. 3 - Chassis ground: (F16) No. 4 - Chassis ground: Is the resistance less than 5 ohms? Go to step 5. Repair the open circuit in harness between sub fan motor connector and chassis ground. 5 CHECK POOR CONTACT. Check poor contact in sub fan motor connector. Is there poor contact in sub fan motor connector? Repair the poor contact in sub fan motor connector. Go to step 6. 6 CHECK MAIN FAN MOTOR. Connect the battery positive (+) terminal to terminal No. 1, and ground (-) terminal to terminal No. 3 or No. 4 of sub fan motor connector. Does the main fan rotate? Repair the poor contact in sub fan motor connector. Replace the sub fan motor with a new one. 7 CHECK POWER SUPPLY TO SUB FAN RELAY1. Turn the ignition switch to OFF. Remove the sub fan relay1 from A/C relay holder. Measure the voltage between sub fan relay1 terminal and chassis ground. Connector & terminal (F27) No. 8 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 8. Go to step 9. 8 CHECK POWER SUPPLY TO SUB FAN RELAY1. Turn the ignition switch to ON. Measure the voltage between sub fan relay1 terminal and chassis ground. Connector & terminal (F27) No. 5 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 12. Go to step 11. 9 CHECK 20 A FUSE. Remove the 20 A fuse from A/C relay holder. Check the condition of fuse. Is the fuse blown out? Replace the fuse. Go to step 10. 10 CHECK POWER SUPPLY TO A/C RELAY HOLDER 20 A FUSE TERMINAL. Measure the voltage of harness between A/C relay holder 20 A fuse terminal and chassis ground. Connector & terminal (F27) No. 3 (+) - Chassis ground (-): Is the voltage more than 10 V? Repair the open circuit in harness between 20 A fuse and sub fan relay terminal. Repair the open circuit in harness between sub fuse box connector and 20 A fuse terminal. 11 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse No. 17 from joint box. Check the condition of fuse. Is the fuse blown out? Replace the fuse. Repair the open circuit in harness between sub fan relay and ignition switch. 12 CHECK SUB FAN RELAY. Turn the ignition switch to OFF. Remove the sub fan relayi. Measure the resistance of sub fan relayi. Terminals No. 8 - No. 9: Is the resistance more than 1 Mohms? Go to step 13. Replace the sub fan relay. 13 CHECK SUB FAN RELAY. Connect the battery to terminals No. 5 and No. 7 of sub fan relay. Measure the resistance of sub fan relay. Terminals No. 8 - No. 9: Is the resistance less than 1 ohms? Go to step 14. Replace the sub fan relay. 14 CHECK HARNESS BETWEEN SUB FAN RELAY TERMINAL AND SUB FAN MOTOR CONNECTOR. Measure the resistance of harness between sub fan motor connector and sub fan relay terminal. Connector & terminal (F16) No. 1 - (F27) No. 9: Is the resistance less than 1 ohms? Go to step 15. Repair the open circuit in harness between sub fan motor connector and sub fan relay terminal. 15 CHECK HARNESS BETWEEN SUB FAN RELAY AND ECM. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance of harness between sub fan relay connector and ECM connector. Connector & terminal (F27) No. 7 - (B136) No. 18: Is the resistance less than 1 ohms? Go to step 16. Repair the open circuit in harness between sub fan relay and ECM. 16 CHECK POOR CONTACT Check poor contact in connector between sub fan and ECM. Is there poor contact in connector between sub fan motor and ECM? Repair the poor contact connector. Record the DTC. Repair the trouble cause. < Ref. to «READ DIAGNOSTIC TROUBLE CODE (DTC)»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/testing-diagnostics/#engine-controls-engine-diagnostics-h4so) . > 17 CHECK POWER SUPPLY TO SUB FAN MOTOR. CAUTION: Be careful not to overheat the engine during repair. Turn the ignition switch to OFF. Disconnect the connector from sub fan motor. Start the engine, and warm it up until engine coolant temperature increases over 96°C (205°F). Turn the A/C switch ON. Measure the voltage while A/C compressor is rotating. Measure the voltage between sub fan motor connector and chassis ground. Connector & terminal (F16) No. 2 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 18. Go to step 20. 18 CHECK POOR CONTACT Check poor contact in sub fan motor connector. Is there poor contact in sub fan motor connector? Repair the poor contact in sub fan motor connector. Go to step 19. 19 CHECK SUB FAN MOTOR. Connect the battery positive (+) terminal to terminal No. 2, and ground (-) terminal to terminal No. 3 or No. 4 of sub fan motor connector. Does the main fan rotate? Repair the poor contact in sub fan motor connector. Replace the sub fan motor with a new one. 20 CHECK POWER SUPPLY TO SUB FAN RELAY2. Turn the ignition switch to OFF. Remove the sub fan relay2 from A/C relay holder. Measure the voltage between sub fan relay2 terminal and chassis ground. Connector & terminal (F27) No. 21 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 21. Go to step 22. 21 CHECK POWER SUPPLY TO SUB FAN RELAY2. Turn the ignition switch to ON. Measure the voltage between sub fan relay2 terminal and chassis ground. Connector & terminal (F27) No. 24 (+) - Chassis ground (-): Is the voltage more than 10 V? Go to step 23. Go to step 24. 22 CHECK 20 A FUSE. Remove the 20 A fuse from A/C relay holder. Check the condition of fuse. Is the fuse blown out? Replace the fuse. Go to step 23. 23 CHECK POWER SUPPLY TO A/C RELAY HOLDER 20 A FUSE TERMINAL. Measure the voltage of harness between A/C relay holder 20 A fuse terminal and chassis ground. Connector & terminal (F27) No. 3 (+) - Chassis ground (-): Is the voltage more than 10 V? Repair the open circuit in harness between 20 A fuse and sub fan relay terminal. Repair the open circuit in harness between sub fuse box connector and 20 A fuse terminal. 24 CHECK FUSE. Turn the ignition switch to OFF. Remove the fuse No. 17 from joint box. Check the condition of fuse. Is the fuse blown out? Replace the fuse. Repair the open circuit in harness between sub fan relay and ignition switch. 25 CHECK SUB FAN RELAY. Turn the ignition switch to OFF. Remove the sub fan relay2. Measure the resistance of sub fan relay2. Terminals No. 20 - No. 21: Is the resistance more than 1 Mohms? Go to step 26. Replace the sub fan relay. 26 CHECK MAIN FAN RELAY. Connect the battery to terminals No. 22 and No. 24 of sub fan relay2. Measure the resistance of main fan relay2. Terminals No. 20 - No. 21: Is the resistance less than 1 ohms? Go to step 27. Replace the sub fan relay. 27 CHECK HARNESS BETWEEN SUB FAN RELAY TERMINAL AND SUB FAN MOTOR CONNECTOR. Measure the resistance of harness between sub fan motor connector and sub fan relay2 terminal. Connector & terminal (F16) No. 2 - (F27) No. 20: Is the resistance less than 1 ohms? Go to step 28. Repair the open circuit in harness between sub fan motor connector and sub fan relay terminal. 28 CHECK HARNESS BETWEEN SUB FAN RELAY AND ECM. Turn the ignition switch to OFF. Disconnect the connector from ECM. Measure the resistance of harness between sub fan relay connector and ECM connector. Connector & terminal (F27) No. 22 - (B136) No. 29: Is the resistance less than 1 ohms? Go to step 29. Repair the open circuit in harness between sub fan relay and ECM. 29 CHECK POOR CONTACT Check poor contact in connector between sub fan and ECM. Is there poor contact in connector between sub fan motor and ECM? Repair the poor contact connector. Record the DTC. Repair the trouble cause. < Ref. to «READ DIAGNOSTIC TROUBLE CODE (DTC)»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/testing-diagnostics/#engine-controls-engine-diagnostics-h4so) . >

Scheme 21

1. Lift-up the vehicle.
2. Remove the under cover.
3. Remove the drain plug to drain engine coolant into container. NOTE: Remove the radiator cap so that engine coolant will drain faster. If engine coolant adheres to the exhaust pipe, wipe it off completely. (Scheme 20): Locating Drain Plug
4. Install the drain plug.

Scheme 22

1. Pour cooling system conditioner through the filler neck. Cooling system protective agent: COOLING SYSTEM CONDITIONER (Part No. SOA635071)
2. Fill engine coolant into the radiator up to filler neck position. Coolant capacity (fill up to "FULL" level): AT model: Approx. 6.9 l (7.3 US at, 6.1 lmp qt) MT model: Approx. 7.0 l (7.4 US qt, 6.2 lmp qt) NOTE: The SUBARU Genuine Coolant containing antifreeze and anti-rust agents is especially made for SUBARU engine, which has an aluminum crank-case. Always use SUBARU Genuine Coolant, since other coolant may cause corrosion.
3. Fill engine coolant into the reservoir tank up to "FULL" level. see scheme 6: Identifying Engine Coolant Into Reservoir Tank Level Mark
4. Close the radiator cap and start the engine. Race 5 to 6 times at less than 3,000 rpm, then stop the engine. (Complete this operation within 40 seconds.)
5. Wait for one minute after the engine stops, open the radiator cap. If the engine coolant level drops, add engine coolant into radiator up to the filler neck position.
6. Perform the procedures 4) and 5) again.
7. Attach the radiator cap and reservoir tank cap properly.
8. Start the engine and operate the heater at maximum hot position and the blower speed setting to "LO".
9. Run the engine at 2,000 rpm or less until radiator fan starts and stops. NOTE: Be careful with the engine coolant temperature gauge to prevent overheating. If the radiator hose becomes to harden by the pressure of engine coolant, air bleeding operation seems to be almost completed.
10. Stop the engine and wait until engine coolant temperature lowers to 30°C (86°F).
11. Open the radiator cap. If the engine coolant level drops, add engine coolant into radiator up to the filler neck position and reservoir tank to "FULL" level.
12. Attach the radiator cap and reservoir tank cap properly.
13. Operate the heater at maximum hot position and the blower speed setting to "LO" and start the engine. Race at less than 3,000 rpm. If the flowing sound is heard at this time, perform the procedures from 9) again.

RELATIONSHIP OF SUBARU COOLANT CONCENTRATION AND FREEZING TEMPERATURE

The concentration and safe operating temperature of the SUBARU coolant is shown in the diagram. Measuring the temperature and specific gravity of the coolant will provide this information.

[Example]

If the coolant temperature is 25°C (77°F) and its specific gravity is 1.054 and the concentration is 35% (point A), the safe operating temperature is -14°C (7°F) (point B), and the freezing temperature is -20°C (-4°F) (point C).

Scheme 23

PROCEDURE TO ADJUST THE CONCENTRATION OF THE COOLANT

To adjust the concentration of the coolant according to temperature, find the proper fluid concentration in the above diagram and replace the necessary amount of coolant with an undiluted solution of SUBARU genuine coolant (concentration 50%).

The amount of coolant that should be replaced can be determined using the diagram. [Example]

Assume that the coolant concentration must be increased from 25% to 40%. Find point A, where the 25% line of coolant concentration intersects with the 40% curve of the necessary coolant concentration, and read the scale on the vertical axis of the graph at height A. The quantity of coolant to be drained is 2.1 l (2.2 US qt, 1.8 lmp qt). Drain 2.1 l (2.2 US qt, 1.8 lmp qt) of coolant from the cooling system and add 2.1 l (2.2 US qt, 1.8 lmp qt) of the undiluted solution of SUBARU coolant.

If a coolant concentration of 50% is needed, drain all the coolant and refill with the undiluted solution only.

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

1. Remove the radiator. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/cooling-fan/#cooling-system-h4so), Radiator. >
2. Remove the V-belts. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#engine-mechanical-h4so), V-belt. >
3. Remove the crank pulley. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#engine-mechanical-h4so), Crank Pulley. >
4. Remove the timing belt. < Ref. to «TIMING BELT»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#engine-mechanical-h4so), REMOVAL, Timing Belt. >
5. Remove the automatic belt tension adjuster. (Scheme 23): Removing Automatic Belt Tension Adjuster
6. Remove the belt idler No. 2. (Scheme 24): Identifying Belt Idler No. 2
7. Remove the cam sprocket (LH) by using ST. ST 18231AA010 CAM SPROCKET WRENCH NOTE: Also the CAM SPROCKET WRENCH (499207100) can be used. (Scheme 25): Removing Cam Sprocket
8. Remove the belt cover No. 2 (LH). (Scheme 26): Locating Belt Cover No. 2 (LH) Bolts
9. Remove the tensioner bracket. (Scheme 27): Identifying Tensioner Bracket
10. Disconnect the hose from water pump.
11. Remove the water pump. (Scheme 28): Removing Water Pump

Scheme 31

1. Install the water pump onto cylinder block (LH). NOTE: Replace the gasket with a new one. When installing the water pump, tighten the bolts in two stages in alphabetical sequence as shown in the figure. Tightening torque: First: 12 N.m (1.2 kgf-m, 8.7 ft-lb) Second: 12 N.m (1.2 kgf-m, 8.7 ft-lb) (Scheme 29): Identifying Alphabetical Sequence Of Water Pump Bolts
2. Connect the hose to water pump.
3. Install the tensioner bracket. Tightening torque: 24.5 N.m (2.5 kgf-m, 18.1 ft-lb) (Scheme 30): Identifying Tensioner Bracket
4. Install the belt cover No. 2 (LH). Tightening torque: 5 N.m (0.5 kgf-m, 3.6 ft-lb) (Scheme 31): Locating Belt Cover No. 2 (LH) Bolts
5. Install the cam sprockets (LH) by using ST. ST 18231AA010 CAM SPROCKET WRENCH NOTE: Also the CAM SPROCKET WRENCH (499207100) can be used. Tightening torque: 78 N.m (8.0 kgf-m, 57.9 ft-lb) see scheme 18: Installing CAM Sprockets Bolts
6. Install the belt idler No. 2. Tightening torque: 39 N.m (4.0 kgf-m, 28.9 ft-lb) see scheme 19: Locating Belt Idler No. 2
7. Install the automatic belt tension adjuster whose tension rod is held with pin. < Ref. to «AUTOMATIC BELT TENSION ADJUSTER ASSEMBLY AND BELT IDLER»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#engine-mechanical-h4so), INSTALLATION, Timing Belt. >
8. Install the timing belt. < Ref. to «TIMING BELT»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#engine-mechanical-h4so), INSTALLATION, Timing Belt. >
9. Install the crank pulley. < Ref. to «INSTALLATION»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#engine-mechanical-h4so), Crank Pulley. >
10. Install the V-belts. < Ref. to «INSTALLATION»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#engine-mechanical-h4so), V-belt. >
11. Install the radiator. < Ref. to «INSTALLATION»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/cooling-fan/#cooling-system-h4so), Radiator. >

Scheme 32

1. Check the water pump bearing for smooth rotation.
2. Check the water pump pulley for abnormalities.
3. Check the impeller for damage or abnormal deformation.
4. Check the clearance between impeller and pump case. Clearance between impeller and pump case: Standard 0.5 - 1.5 mm (0.020 - 0.060 in) see scheme 20: Checking Clearance Between Impeller And Pump Case
5. After water pump installation, check the pulley shaft for engine coolant leaks. If leaks are noted, replace the water pump assembly.

Scheme 33

Scheme 34

1. Set the vehicle on a lift.
2. Lift-up the vehicle.
3. Remove the under cover.
4. Drain the engine coolant completely. < Ref. to «DRAINING OF ENGINE COOLANT»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/cooling-fan/#cooling-system-h4so), REPLACEMENT, Engine Coolant. > see scheme 21: Locating Engine Coolant Drain Plug
5. Disconnect the radiator outlet hose from thermostat cover. (Scheme 32): Locating Radiator Outlet Hose From Thermostat Cover
6. Remove the thermostat cover, and then remove the gasket and thermostat. see scheme 23: Identifying Thermostat Cover, Gasket And Thermostat

Scheme 35

1. Install a gasket to thermostat, and install the thermostat and gasket to water pump as a unit. Then, install the thermostat cover. NOTE: When reinstalling the thermostat, use a new gasket. The thermostat must be installed with the jiggle pin facing to the up side. Tightening torque: 12 N.m (1.2 kgf-m, 8.7 ft-lb) (Scheme 33): Identifying Thermostat Cover, Gasket, Thermostat And Jiggle Pin
2. Connect the radiator outlet hose to thermostat cover.
3. Install the under cover.
4. Lower the vehicle.
5. Fill with engine coolant. < Ref. to «FILLING OF ENGINE COOLANT»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/cooling-fan/#cooling-system-h4so), REPLACEMENT, Engine Coolant. >

Replace the thermostat if the valve does not close completely at an ambient temperature or if the following test shows unsatisfactory results.

1. Inspection method Immerse the thermostat and a thermometer in water. Raise water temperature gradually, and measure the temperature and valve lift when the valve begins to open and when the valve is fully opened. During the test, agitate the water for even temperature distribution. The measured value should meet the specification.

Note. Leave the thermostat in the boiling water for more than five minutes before measuring the valve lift. Hold the thermostat with a wire or the like to avoid contacting with container bottom.

Starting temperature to open

80 - 84°C (176-183°F)

Fully opens

95°C(203°F)

Valve lift

9.0 mm (0.354 in) or more.

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

1. Set the vehicle on a lift.
2. Disconnect the ground cable from battery.
3. Lift-up the vehicle.
4. Remove the under cover.
5. Drain the engine coolant completely. < Ref. to «DRAINING OF ENGINE COOLANT»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/cooling-fan/#cooling-system-h4so), REPLACEMENT, Engine Coolant. >
6. Disconnect the connectors of radiator main fan motor (A) and sub fan motor (B). (Scheme 35): Identifying Connectors Of Radiator Main Fan Motor (A) And Sub Fan Motor (B) (Scheme 36): Identifying Connectors Of Radiator Main Fan Motor (A) And Sub Fan Motor (B)
7. Disconnect the radiator outlet hose from water pump. (Scheme 37): Locating Radiator Outlet Hose From Water Pump
8. Disconnect the ATF cooler hoses from ATF pipe. (AT model) Plug the openings in the hose and radiator with caps in order to prevent ATF from leaking. (Scheme 38): Locating ATF Cooler Hoses Clamp From ATF Pipe
9. Lower the vehicle.
10. Disconnect the overflow hose.
11. Remove the reservoir tank. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/cooling-fan/#cooling-system-h4so), Reservoir Tank. >
12. Remove the air intake duct.
13. Disconnect the radiator inlet hose from engine. (Scheme 39): Locating Radiator Inlet Hose Clamp
14. Remove the radiator upper brackets. (Scheme 40): Locating Radiator Upper Brackets
15. Detach the power steering hose from clip on radiator. (Scheme 41): Identifying Power Steering Hose From Clip On Radiator
16. Lift the radiator up and away from the vehicle.

Scheme 44

1. Attach the radiator lower cushions to holes on the radiator lower bracket. (Scheme 42): Identifying Radiator Lower Cushions Holes On Radiator Lower Bracket
2. Install the radiator to vehicle. NOTE: Fit the pins on lower side of radiator into the cushions on the body side.
3. Install the radiator upper brackets, and then tighten the bolts. Tightening torque: 18 N.m (1.8 kgf-m, 13.0 ft-lb) (Scheme 43): Locating Radiator Upper Brackets Bolts
4. Attach the power steering hose to radiator. (Scheme 44): Identifying Power Steering Hose
5. Connect the radiator inlet hose. see scheme 36: Locating Radiator Inlet Hose Clamp
6. Install the air intake duct.
7. Install the reservoir tank.
8. Connect the overflow hose.
9. Lift-up the vehicle.
10. Connect the ATF cooler hoses. (AT model) see scheme 37: Locating ATF Cooler Hoses Clamp
11. Connect the radiator outlet hose. see scheme 38: Locating Radiator Outlet Hose Clamp
12. Connect the connectors to radiator main fan motor (A) and sub fan motor (B). see scheme 39: Identifying Radiator Main Fan Motor Connectors see scheme 40: Identifying Sub Fan Motor Connectors
13. Install the under cover.
14. Lower the vehicle.
15. Connect the battery ground cable to battery.
16. Fill engine coolant. < Ref. to «FILLING OF ENGINE COOLANT»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/cooling-fan/#cooling-system-h4so), REPLACEMENT, Engine Coolant. >
17. Check the ATF level. < Ref. to «INSPECTION»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/automatic-trans/#automatic-transmission__inspection), Automatic Transmission Fluid. >

Scheme 45

1. Remove the radiator cap, top off radiator, and then attach the tester to radiator in place of cap. see scheme 41: Attaching Tester To Radiator In Place Of Cap
2. Apply a pressure of 157 kPa (1.6 kgf/cm 2, 23 psi) to the radiator in the follow cases. Engine coolant leaks at/around radiator. Engine coolant leaks at/around hoses or connections. CAUTION: Engine should be turned off. Wipe engine coolant from check points in advance. If engine coolant adheres to the exhaust pipe, wipe it off completely. Be careful to prevent engine coolant from spurting out when removing the tester. Be careful also not to deform the filler neck of radiator when installing or removing tester.

Scheme 46

1. Attach the radiator cap to tester. see scheme 42: Attaching Radiator Cap To Tester
2. Increase the pressure until tester gauge pointer stops. Radiator cap is functioning properly if it holds the service limit pressure for 5 to 6 seconds. Standard pressure: 93 - 123 kPa (0.95 - 1.25 kgf/cm 2, 14 - 18 psi) Service limit pressure: 83 kPa (0.85 kgf/cm 2, 12 psi) CAUTION: Be sure to remove foreign matter and rust from the cap in advance. Otherwise, results of pressure test will be incorrect.

Scheme 47

1. Set the vehicle on a lift.
2. Disconnect the ground cable from battery.
3. Lift-up the vehicle.
4. Remove the under cover.
5. Disconnect the connector of main fan motor (A). (Scheme 45): Identifying Main Fan Motor Connector
6. Remove the ATF hose from clip of radiator main fan motor assembly. (AT model)
7. Lower the vehicle.
8. Disconnect the overflow hose.
9. Remove the reservoir tank. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/cooling-fan/#cooling-system-h4so), Reservoir Tank. >
10. Remove the bolts which secure the radiator main fan shroud to radiator. (Scheme 46): Locating Radiator Main Fan Shroud Bolts
11. Remove the radiator fan motor assembly.

INSTALLATION

Install in the reverse order of removal.

Note. If it is difficult to install the radiator main fan motor assembly, first loosen the bolts which hold the radiator sub fan motor assembly. Refer to COMPONENT for tightening torque. < Ref. to COMPONENT , General Description. >

Scheme 48

Scheme 49

1. Remove the nut which holds the fan onto fan motor. see scheme 45: Locating Fan Motor Nut
2. Remove the bolts which install the fan motor onto shroud. (Scheme 47): Locating Fan Motor Shroud Bolts

ASSEMBLY

Assemble in the reverse order of disassembly.

Tightening torque

4.4 N.m (0.45 kgf-m, 3.3 ft-lb)

Tightening torque

3.4 N.m (0.35 kgf-m, 2.5 ft-lb)

Scheme 50

1. Set the vehicle on a lift.
2. Disconnect the ground cable from battery.
3. Lift-up the vehicle.
4. Remove the under cover.
5. Disconnect the connector of sub fan motor (B). see scheme 49: Identifying Sub Fan Motor Connector
6. Remove the ATF hose from clips of radiator sub fan motor assembly. (AT model)
7. Lower the vehicle.
8. Remove the air intake duct.
9. Remove the bolts which hold the radiator sub fan shroud to radiator. see scheme 50: Locating Radiator Sub Fan Shroud Bolts
10. Remove the radiator sub fan motor assembly through the under side of vehicle.

Install in the reverse order of removal.

Note. Refer to COMPONENT for tightening torque. < Ref. to COMPONENT , General Description. >

Scheme 51

Scheme 52

1. Remove the clip which holds the motor connector onto shroud.
2. Remove the nut which holds the fan onto fan motor. see scheme 51: Locating Fan Motor Nut
3. Remove the bolts which install the fan motor onto shroud. (Scheme 50): Locating Fan Motor Shroud Bolts

Assemble in the reverse order of disassembly.

Tightening torque

4.4 N.m (0.45 kgf-m, 3.3 ft-lb)

Scheme 53

Tightening torque

3.4 N.m (0.35 kgf-m, 2.5 ft-lb)

Scheme 54

1. Disconnect the overflow hose from the radiator filler neck position.
2. While pressing the pawl (A), remove the reservoir tank by pulling in the direction of arrow. (Scheme 53): Identifying Pawl

Install in the reverse order of removal.

Make sure the engine coolant level is between "FULL" and "LOW".

POSSIBLE CAUSE

See also:
• READ DIAGNOSTIC TROUBLE CODE (DTC)
• REMOVAL
• INSPECTION
• REMOVAL