[mreid]

The problem with leaking heater cores and their replacement, particularly on Fords, is that one leak is usually followed by others. Use the Alumiseal, but be prepared to use more if you keep the car for a few more years. Also, the heater core is enclosed in the heater and a/c box. The only way to access the box is to remove the dash as some of the mounting bolts, wiring, vacuum lines, water lines, a/c hoses, and ducting are on top of the unit. Not only is there the potential to break things taking it apart, it is very easy to damage other wiring puting it back together. I don't blame you at all for being reluctant to tackle the job. Expect the mechanic to feel the same and to charge you accordingly. I know you are in Ohio and need the heater, but if the sealant doesn't work, you could always bypass the core on the engine side.