Chevrolet Cobalt Service & Repair Manual: Engine Coolant Temperature Sending Unit R&R

Refer to Fig. 1 when performing the following procedure.
1. Disconnect the negative battery cable.
2. Remove the cover from the underhood electrical center.
3. Remove the underhood positive battery terminal lug.
4. Disconnect the positive battery cables from the underhood electrical center.
5. Reposition the body harness from the electrical center top cover.
6. Loosen all of the underhood electrical center bolts.
7. Remove the underhood electrical center (1) from the vehicle.
8. Remove the engine control module.
9. Disconnect the electrical harness from the junction block bracket.
10. Remove the bracket lower bolts (2), junction block bracket support nut (1), and the junction block bracket (3), Fig. 2.
11. Partially drain the cooling system.
12. Remove engine coolant temperature sensor and disconnect electrical connector.
13. Reverse procedure to install, noting the following:
  a. Torque engine coolant temperature sensor to 15 ft. lbs.
  b. Torque junction block bracket nut and lower bolts to 89 inch lbs.
  c. Torque underhood electrical center bolts to 89 inch lbs.
  d. Torque underhood positive battery terminal lugs to 133 inch lbs.

Fig. 1 Engine coolant temperature sensor replacement

Fig. 2 Junction black bracket replacement

    Engine Coolant Expansion Tank, Replace
    1. Drain engine coolant into suitable container. 2. Reposition coolant expansion tank inlet hose clamp using hose clamp pliers tool ...

    Engine Coolant Thermostat Housing R&R
    Refer to Fig. 1 when performing the following procedure. 1. Partially drain the coolant system. 2. Remove the thermostat. ...

    See also:

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    Chevrolet Cobalt Owners Manual

    Chevrolet Cobalt Service Manual

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