When I changed my fluid this time when no more would exit the bottom petcock I experimented with a weak air push from my compressor through the top petcock and was surprised that about another gallon came out, who knows from where. I can't imagine that much was still in the radiator alone. Maybe somehow pushed through the tubes under the car? Also rigged a hose at the bottom petcock because I didn't like the fluid always flowing into the front valance. Worked perfect, not a drop on the car itself.
