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As far as i know, if you are talking about the 3.4L: if you are standing at the front of the car looking at the engine, it is going to be on the right side. It is in a very tricky spot. It is underneath the air intake where the intake hits the engine. You can't see it unless you remove the intake and unbolt the metal pipe where the coolant goes into the engine. Basically, if you have little to no mechanical skills....take it somewhere. Buy the thermostat yourself and pay for the labor....

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Q: Where is the thermostat on a 2003 Impala?
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