Water Pump: Service and Repair

Coolant Pump & Thermostat Removing and Installing

Note: Refer to "Overview of Engine Side Components" for Location and the "Component View With Notes" sections during removal and installation procedures.

Overview of Engine Side Components






1. 0-Ring
Always replace

2. 10 Mn (7 ft lb)
3. From expansion tank
4. Retaining clip
5. Engine Coolant Temperature (ECT) sensor -G62- or sensor for engine temperature -G27-
With Engine Coolant Temperature (ECT) sensor - G2-

6. Coolant hose
Engine code AHU: to EGR cooler
Engine codes AAZ, 1Z: to heater core

7. Not applicable for USA/Canada
8. From heater core
9. To expansion tank
10. Bracket
11. Coolant line

12. Oil cooler
Removing and Installing

13. From bottom of radiator

14. 20 Nm (15 ft lb) + 1/4 turn (90°)
Always replace

15. Bracket
For ribbed belts without tensioner

16. 30 Nm (22 ft lb)

17. V-Belt/Ribbed belt
Removing and installing Service and Repair
Adjusting belt tension Adjustments

18. Engine coolant pump
19. To top of radiator

Component View With Notes






1. 25 Nm (18 ft lb)

2. Pulley
Ribbed drive belt version

3. Engine coolant pump
Check shaft for ease of movement

4. Gasket
Always replace

5. Coolant thermostat
Checking: heat-up thermostat in boiling water
Opening commences approx: 85°C (185°F)
Ends approx: 105°C (221°F)
Opening lift: 7 mm minimum

6. Elbow Connection

7. O-ring
Always replace

8. Retaining clip
9. 10 Nm (7 ft lb)
10. Thermostat Flange

11. Pulley
V-Belt version