[baumbr]

If you ran plain water through the winter you may have popped a freeze plug on the side of the engine. They look like round indentations in the side of the block, usually about the size of a 50 cent piece. If one of these is leaking pop it the rest of the way out and press in a new one. This can be an awkward item to get to and fix, you may want to find a mechanically inclined friend to help.

Check your oil. If it is brown, milk shake looking or seems to have brown or white bubbles in it then a gasket or the block has a crack in it and is leaking water into the oil. Gaskets are tedious but not too difficult. A cracked block is a new engine.

Inspect your entire cooling system, radiator, hoses, heater core, engine block, recovery tank and try to find the leak. If you are using properly mixed coolent you'll see its color somewhere. Ice can do damage in the strangest places. Good luck and let us know what you find.