Please check notes in each part listing to ensure the Thermostat is correct for your 1989 PONTIAC OPTIMA with a 1.6L 1606cc 98 engine. ACDELCO & GATES are competing brands, and each brand's Thermostat may be interchangeable. Special restrictions like "California only" or "with sport package" may indicate a Thermostat fits only certain 1989 PONTIAC OPTIMA models.
Clicking a "More Info" link will display a picture and/or other details about that Thermostat in a separate window (you may need to turn off your pop-up-blocking software for this to work).
After choosing a Thermostat, 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 on "Find More Parts", to find more Cooling System parts, other PONTIAC OPTIMA parts, or parts for a different vehicle. Please try our Interactive Catalog (click red Start button above) for faster searching. Both catalogs use the same shopping cart, so any auto parts you've already chosen for your 1989 PONTIAC will not be lost if you switch.
