Having problems with your 2003 Chevrolet Impala ?
How to change termosat on 2003 chevy impala - 2003 Chevrolet Impala
Follow top radiator hose to the engine there should be a roundish housing that the hose connects to and it has a couple bolts on it. Pull the old one out put the new one in make sure the spring side is down in the engine. Ask your auto store guy what gaskets and sealants you need.
Repair Help & Product Troubleshooting for 2003 Chevrolet Impala
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