Can you give me engine size? If you are unsure, I can use the 8th digit of your VIN# XXXXX identify.
Can you re-check that VIN#? The 8th digit should either be and "F" or a "P" - you have an "S" there, and there is no "S" engine code for a 2005 Cobalt.
Ok. Now we're good...
It's at the rear of the motor. Follow the radiator hose from the radiator to the engine.
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Thanks in advance!