No matter the condition of your 1983 Bonneville, OPGI has the Heater Cores you need to boost performance and get you back on the road. We currently carry two Heater Cores to choose from for your 1983 Bonneville, and our Price Match Guaranteed prices range from as little as $8.99 up to $62.99. OPGI offers RESTOPARTS plus minus one other trusted brands of Heater Cores for your 1983 Bonneville, to help you find quality parts you can rely on. With OPGI's 45-day return policy and thousands of customer reviews, you can shop with the utmost confidence. Enjoy parts delivered directly to your home, or visit our sunny Southern California Showroom & Warehouse to check out our Heater Cores in person.