How to Change the Thermostat in a Chevy Cobalt

2005 The Chevy Cobalt is a great example of American automaker's ability to produce an economical, four-cylinder, front-wheel drive compact that stands up to the Japanese competition. Introduced in 2005, the Cobalt replaced the Chevy Cavalier with stepped up quality and warranty coverage. The 2.2L engine has sufficient pep and good fuel economy. The following steps guide you through the installation of the thermostat in the 2005 Cobalt.

Step 1 - Make sure the engine is completely cool. Drain the cooling system.

Step 2 - Loosen the bolts to the thermostat housing to the water pump feed pipe. Take off the bolts and set them aside. Remove the feed pipe.

Step 3 - Take out the thermostat and the retaining sleeve. Note the orientation of the sleeve for correct positioning during the installation. Make a scribe mark as needed.

Step 4 - Install the new thermostat and its retaining sleeve. Push the dimple into the housing slot.

Step 5 - Coat the O-ring with coolant or soapy water. Install the O-ring to the water pump.

Step 6 - Set the water pump feed pipe in place to connect the thermostat housing and the water pump. Install the water pump feed pipe bolt. Torque the bolt to 18 inch lbs.

Fill the cooling system with the appropriat type and amount of coolant. Start the engine and let it run for several minutes. Check systems to make sure the thermostat is working properly.

WARNINGS: Drain the coolant into a container that can be sealed. Small pets and farm animals, will drink coolant left in open containers or on the floor. Ingestion is usually fatal. Properly dispose of used coolant.

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