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Tim West
Tim West, ASE Certified Technician
Category: Chevy
Satisfied Customers: 4638
Experience:  ASE Certified Service manager of Firestone
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How do I change the thermostat on a 2005 Chevrolet Cobalt ?

Resolved Question:

How do I change the thermostat on a 2005 Chevrolet Cobalt ?
Submitted: 6 years ago.
Category: Chevy
Expert:  Tim West replied 6 years ago.
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Thermostat Replacement

Removal Procedure

  1. Drain the cooling system.



  1. Remove the bolts that secure the thermostat housing to the water pump feed pipe.



  1. Remove the feed pipe.



  1. Remove the thermostat and retaining sleeve, noting the orientation for installation.

Installation Procedure



  1. Install the thermostat and retaining sleeve with the dimple placed into the housing slot.



  1. Important: Lubricate the O-ring with soapy water or coolant before installing the O-ring in the water pump.

Install the feed pipe that connects the thermostat housing to the water pump.



  1. Notice: Refer to Fastener Notice in Service Precautions.

Install the bolt that secures the water pump feed pipe.

  • Tighten the bolt to 10 Nm (18 inch lbs.) .
  1. Fill the cooling system.
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