This heater core is constructed out of aluminum and is for Mercury Cougars and Ford Mustangs without air conditioning. To be honest, aluminum is not the best material to construct a heater core out of. Eventually it will erode and leak. We will not warranty these cores, and we only have a limited supply of them in stock. When they are gone, they are gone.
Check out our video below on how to replace a heater core! We used a '69 Cougar with AC, but many of the same concepts apply to other years.