This heater core from Ecklers Chevelle & Malibu 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 Chevelle or Malibu'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. Ecklers Chevelle & Malibu always has you covered.