How to replace the thermostat in a cooling system on 2005 Chevrolet Cobalt?

The first step towards changing the Thermostat is draining the cooling system. Then, take out the bolts holding the Thermostat Housing in place to the Water Pump feed pipe, then remove the feed pipe. Carefully but record due to a subsequent reinstallation, care for removed Thermostat and retaining sleeve's orientation. During installation, install and secure the Thermostat and retaining sleeve with dimple in the housing slot. Before fitting in Water Pump, the o-ring should be lubricated with soapy water or coolants. Replace the feed pipe joining Thermostat Housing to Water Pump, and adhere to the fastener notice in service precautions. Screw the bolt to secure the Water Pump feed pipe doing a 10 nm (18 inch lbs), and finally topping up the cooling system.

OEM 2005 Chevrolet Cobalt Thermostat

Engine Coolant Thermostat

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2005 Chevrolet Cobalt Thermostat, Green Line Part Number: 12622410
$69.04 MSRP: $153.83
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Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat Kit, Engine Coolant Temperature; Thermostat, Engine Coolant Temperature
- Replaces: 21018811, 55350941, 90537453, 12615097
- Item Weight: 0.50 Pounds
- Item Dimensions: 3.1 x 3.1 x 3.1 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 12622410
- Warranty: This genuine part is guaranteed by GM's factory warranty.
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Fits the following 2005 Chevrolet Cobalt Submodels:
- Base, LS, LT, LTZ, Sport, SS | 4 Cyl 2.0 L GAS, 4 Cyl 2.2 L GAS, 4 Cyl 2.4 L GAS
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2005 Chevrolet Cobalt Thermostat Housing Part Number: 12584898
Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Replaces: 13104425
- Item Weight: 3.10 Pounds
- Item Dimensions: 16.4 x 9.7 x 9.7 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 12584898
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2005 Chevrolet Cobalt Submodels:
- Base, LS, LT | 4 Cyl 2.2 L GAS
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2005 Chevrolet Cobalt Thermostat Housing Part Number: 12583152
Product Specifications
- Other Name: Housing, Engine Coolant Thermostat
- Item Weight: 1.60 Pounds
- Item Dimensions: 13.0 x 9.9 x 5.7 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 12583152
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2005 Chevrolet Cobalt Submodels:
- SS | 4 Cyl 2.0 L GAS

2005 Chevrolet Cobalt Thermostat

With a comprehensive array of OEM 2005 Chevrolet Cobalt Thermostat, from fuel pumps to door handles, our website is a one-stop-shop for your needs. All our genuine 2005 Chevrolet Cobalt Thermostat are backed by the manufacturer's warranty and are offered at competitive prices in the market. Rest assured, you can shop with complete confidence.

2005 Chevrolet Cobalt Thermostat Parts and Q&A

Q: How to replace the thermostat in a cooling system on 2005 Chevrolet Cobalt?
A: The first step towards changing the Thermostat is draining the cooling system. Then, take out the bolts holding the Thermostat Housing in place to the Water Pump feed pipe, then remove the feed pipe. Carefully but record due to a subsequent reinstallation, care for removed Thermostat and retaining sleeve's orientation. During installation, install and secure the Thermostat and retaining sleeve with dimple in the housing slot. Before fitting in Water Pump, the o-ring should be lubricated with soapy water or coolants. Replace the feed pipe joining Thermostat Housing to Water Pump, and adhere to the fastener notice in service precautions. Screw the bolt to secure the Water Pump feed pipe doing a 10 nm (18 inch lbs), and finally topping up the cooling system.