Please check notes in each part listing to ensure the Multi-Function Switch is correct for your 2003 CHEVROLET IMPALA with a 3.8L engine. DORMAN & AIRTEX / WELLS are competing brands, and each brand's Multi-Function Switch may be interchangeable. Special restrictions like "California only" or "with sport package" may indicate a Multi-Function Switch fits only certain 2003 CHEVROLET IMPALA models.
Clicking a "More Info" link will display a picture and/or other details about that Multi-Function Switch in a separate window (you may need to turn off your pop-up-blocking software for this to work).
After choosing a Multi-Function Switch, click the "Add Part" button. Shipping costs will be shown on the Shopping Cart page. You may use your browser's Back button or click "Find More Parts" to find more Electrical-Switch & Relay parts, other CHEVROLET IMPALA parts or parts for a different vehicle. Please try our Interactive Catalog (click link above) for faster searching. Both catalogs use the same shopping cart so any auto parts you've already chosen for your 2003 CHEVROLET will not be lost if you switch.