Chevrolet Cobalt Service & Repair Manual: Thermostat, 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. |
Reverse procedure to install. Torque
thermostat housing 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
The key should be in the OFF position
when connecting the electrical connectors to ensure proper calibration.
1.
Remove fuse labeled HVAC CTRL (BATT).
...
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. Relearn
Initialization Sequence
The EBCM performs one initialization
test each ignition cycle. The initialization of the EBCM occurs when the
EBCM detects the there is a minimum of 500 RPM from the ECM by means of
a serial data message and the stop lamp switch is not applied. The initial ...
Chevrolet Cobalt Owners Manual
Chevrolet Cobalt Service Manual
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