Reproduction Of Original Fits Cars With Air Conditioning Only This heater core from The El Camino Store is a bolt-in replacement of your leaky, decayed original. Even when repaired and tested, original heater cores often spring new leaks due to age and weakness in the core and seams at the tanks. A really good way to ruin your carpet! We always recommend replacing your El Camino's heater core even before the first signs of trouble. The part features an all new core soldered to new top and bottom tanks and brackets. It is ready to install inside your stock heater box assembly. The El Camino Store always has you covered.