How to replace a thermostat in a cooling system for Chevrolet Cobalt,HHR,Saturn ION and Pontiac G5?

Before faulting the thermostat, check the coolant level, drive belt tension, and temperature gauge. To replace the thermostat, disconnect the battery's negative terminal and drain the coolant. Detach the hoses from the thermostat housing cover. Remove the thermostat and install a new gasket.

Genuine Chevrolet Cobalt Thermostat

Engine Coolant Thermostat

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6 Thermostats found

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Chevrolet Cobalt Thermostat Assembly, Engine Coolant
Part Number: 12622410
- Other Name: THERMOSTAT, Engine Coolant Temperature; Thermostat
- Replaces: 21018811, 90537453, 55350941, 12615097
$75.03 MSRP: $152.26
You Save: $77.23 (51%)

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Fits the following Vehicles:
2005-2010 Chevrolet Cobalt | 2 DOOR, 4 DOOR, LEVEL 4 PERFORMANCE (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 4 DOOR, LEVEL ONE (LS) 2 DOOR, LEVEL ONE (LS) 4 DOOR, LEVEL THREE (SS) 2 DOOR, LEVEL THREE (SS) 4 DOOR, LEVEL TWO (LT) 2 DOOR, LEVEL TWO (LT) 4 DOOR | 4 Cyl 2.0L, 4 Cyl 2.2L, 4 Cyl 2.4L
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Chevrolet Cobalt Housing Assembly, Engine Coolant Thermostat
Part Number: 12597172
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing, Water Manifold
$89.11 MSRP: $187.21
You Save: $98.10 (53%)

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Fits the following Vehicles:
2006-2010 Chevrolet Cobalt | 2 DOOR, 4 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 4 DOOR, LEVEL ONE (LS) 2 DOOR, LEVEL ONE (LS) 4 DOOR, LEVEL THREE (SS) 2 DOOR, LEVEL THREE (SS) 4 DOOR, LEVEL TWO (LT) 2 DOOR, LEVEL TWO (LT) 4 DOOR | 4 Cyl 2.2L, 4 Cyl 2.4L
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Chevrolet Cobalt Housing Assembly, Engine Coolant Thermostat
Part Number: 12605853
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing
$90.64 MSRP: $190.42
You Save: $99.78 (53%)

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More Info
Fits the following Vehicles:
2008-2010 Chevrolet Cobalt | LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 4 DOOR | 4 Cyl 2.0L
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Chevrolet Cobalt Housing Asm,Engine Coolant Thermostat
Part Number: 12583152
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing
More Info
Fits the following Vehicles:
2005-2007 Chevrolet Cobalt | LEVEL 4 PERFORMANCE (SS) 2 DOOR, LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR | 4 Cyl 2.0L
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Chevrolet Cobalt Housing Assembly, Engine Coolant Thermostat
Part Number: 12584898
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing
- Replaces: 13104425
More Info
Fits the following Vehicles:
2005 Chevrolet Cobalt | 2 DOOR, 4 DOOR, LEVEL 4 PERFORMANCE (SS) 2 DOOR, LEVEL ONE (LS) 2 DOOR, LEVEL ONE (LS) 4 DOOR, LEVEL TWO (LT) 2 DOOR, LEVEL TWO (LT) 4 DOOR | 4 Cyl 2.2L
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Chevrolet Cobalt Housing Assembly, Engine Coolant Thermostat
Part Number: 12590275
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing
More Info
Fits the following Vehicles:
2008 Chevrolet Cobalt | LEVEL 4 PERFORMANCE/SC (SS) 2 DOOR | 4 Cyl 2.0L
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Chevrolet Cobalt Thermostat Parts Questions & Answers

Housing Assembly, Engine Coolant Thermostat
12597172
Q: How to replace a thermostat in a cooling system for Chevrolet Cobalt,HHR,Saturn ION and Pontiac G5?
A: Before faulting the thermostat, check the coolant level, drive belt tension, and temperature gauge. To replace the thermostat, disconnect the battery's negative terminal and drain the coolant. Detach the hoses from the thermostat housing cover. Remove the thermostat and install a new gasket.