While that is gone, turned attention to the heater box. Using DMT foams and gaskets, redoing the box was a breeze. Amazing how easy it was to get the old petrified stuff out of there. I bought an after market heater core but the piece of junk did not compare at all to the original one so it went back for a refund. I took the old one to a radiator shop and he boiled it out and pressure checked it and it went back in. Checked the evaporator and it also was tight so I will reuse it too.