No matter the condition of your 2003 Monte Carlo, OPGI has the Heater & Ac products you need to boost performance and get you back on the road. We currently carry five Heater & Ac items to choose from for your 2003 Monte Carlo, and our Price Match Guaranteed prices range from as little as $18.99 up to $425.99. OPGI offers Vintage Air plus zero other trusted brands of Heater & Ac products for your 2003 Monte Carlo, to help you find quality parts you can rely on. With OPGI's 45-day return policy, 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 & Ac items in person.