[MaSnaka]

I used a wet/dry shop vac on the T-Stat hole and reversed the air flow to blow. Withe the petcock of the radiator open this forced the water out of the intake. Make sure you have a rag stopping the upper hose to blow back and keep the cap on. It doesn't have to be an air tight seal just creates a little help with the water draining.

After using a razor blade or utility knife on RTV, a little prying will probably break it loose.

/John