Ok so after replacing a coolant resevuoir, I attempted to drain off enough plain water, with car running but cold, by removing top radiator hose so I could add adequate amount of antifreeze / coolant. When I removed hose I heard acouple of awful clanks or knocks and immediately shut car down. Filled coolant up to desired strength and went for a drive. Stuck in first gear!!???!!? WTF did I do ?? WTF can I do now???

 

Bump!