Please check notes in each part listing to ensure the A/C System Relay is correct for your 1978 MAZDA COSMO with a 1.3L engine. Special restrictions like "California only" or "with sport package" may indicate a A/C System Relay fits only certain 1978 MAZDA COSMO models.

Clicking a "More Info" link will display a picture and/or other details about that A/C System Relay in a separate window (you may need to turn off your pop-up-blocking software for this to work).

After choosing a A/C System Relay, 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 MAZDA COSMO 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 1978 MAZDA will not be lost if you switch.