Chevrolet Cobalt Service & Repair Manual: Water Pump, Replace
1. |
Remove intake manifold cover. |
2. |
Drain cooling system into suitable
container. A drain plug is located at the bottom of water pump. |
3. |
Disconnect Engine Coolant Temperature
(ECT) sensor electrical connector. |
4. |
Remove Heated Oxygen Sensor (HO2S)
electrical connector clip from thermostat housing. |
5. |
Remove ECT sensor, Fig. 1. |
6. |
Reposition radiator outlet hose clamp
at thermostat cover. |
7. |
Remove radiator outlet hose from thermostat
cover. |
8. |
Remove exhaust heat shield studs. |
9. |
Remove exhaust heat shield. |
10. |
Reposition heater inlet and outlet
hose clamps at thermostat housing pipes. |
11. |
Disconnect heater inlet and outlet
hoses from thermostat housing pipes. |
12. |
Raise and support vehicle. |
13. |
Remove thermostat housing bolts,
Fig. 2. |
14. |
Remove thermostat from vehicle. |
15. |
Remove water transfer pipe from thermostat
housing. |
16. |
Remove and discard water transfer pipe
O-ring seals, Fig. 3. |
17. |
Remove thermostat cover bolts and cover. |
19. |
Remove and discard thermostat cover
O-ring seal. |
20. |
Remove all debris and thread sealant
from ECT sensor and bolt holes if housing is being re-used. |
21. |
Remove water pump access plate from
front cover, Fig. 4. |
22. |
Remove right hand fender liner. |
23. |
Install water pump holding tool No.
J 43651, or equivalent, to sprocket and chain during water pump
service. Tool must be used or the balance shaft must be re-timed. |
24. |
Tighten bolts on water pump holding
tool into threads on water pump sprocket. |
25. |
Install access cover bolts that were
removed earlier to secure water pump holding tool to front cover
assembly. |
26. |
Remove three inner water pump sprocket
to water pump blots, Fig. 5. |
27. |
Remove two outer water pump bolts,
Fig. 6. |
28. |
Remove two rear water pump bolts,
Fig. 7. |
29. |
Remove water pump. Discard water pump
O-ring seal. |
30. |
Reverse procedure to install, noting
the following: |
|
a. |
Install a new water pump O-ring seal. |
|
b. |
Using suitable guide pin, then align
pin with water pump holding tool, Fig. 8. |
|
e. |
Torque water pump bolts to 18
ft. lbs. |
|
f. |
Torque water pump sprocket bolts
to 89 inch lbs. |
|
g. |
Torque water pump access plate
bolts to 89 inch lbs. |
|

Fig. 1 Engine coolant temperature sensor removal

Fig. 2 Engine coolant thermostat housing replacement

Fig. 3 Exploded view of thermostat cover & O-ring seal

Fig. 4 Front water pump cover access plate removal

Fig. 5 Inner water pump sprocket to water pump blot locations

Fig. 6 Outer water pump bolts

Fig. 7 Rear water pump bolts

Fig. 8 Water pump guide pin and pump installation
1.
Remove intake manifold cover.
2.
Drain cooling system into suitable
container. A drain plug is located at the bottom of water pump.
...
See also:
Chevrolet Cobalt Service & Repair Manual. Description & Operation
The SIR system helps supplement
the protection offered by the driver and front passenger seat belts by deploying
air bag module from the center of steering wheel, passenger's instrument
panel, front and rear sides of seats and from the sides of the roof panel.
The air bags ...
Chevrolet Cobalt Owners Manual
Chevrolet Cobalt Service Manual