Please check notes in each part listing to ensure the A/C Compressor Relief Valve is correct for your 1991 GMC SONOMA with a 4.3L 262 engine. Special restrictions like "California only" or "with sport package" may indicate a A/C Compressor Relief Valve fits only certain 1991 GMC SONOMA models.

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

After choosing a A/C Compressor Relief Valve, 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 Heat & Air Conditioning parts, other GMC SONOMA 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 1991 GMC will not be lost if you switch.